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Contributions from the United States National Herbarium, Volume 10 online

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Of the above figures the first of Pantocsek's is worthless; those in Janisch and in
Luard & Witt must be looked upon as representing extreme varieties.

Pn the specimen accompanying this report the frustule has two valves quite differ-
ent in the arrangement of the beading, a good commentaiy on the constantly repeated
absurdity of making "new species" out of such trifles.
Found at station 3604H, Bering Sea.

Cosdiiodiscus exoentrious Ehrenb. Phys. Abh. Akad. Wiss. Berl. 1839: 146.

1841; 1841: 323. pi. S. VII. /. 5. 1843; Mikrog. pi. 18./. S2, pi. 21. /. 6.

W. Smith, Synop. Brit. Diat. 1: 23. pi. S. /. 38. 1853. Schmidt, Atlas pi. 68.

/. 46-49; Jahresb. Komm. Deut. Meere 2: pi. 3./. 36-38. 1874. Grun. Denkschr.

Akad. Wien 48^: 84. pi. 4D. /. 7. 1884. Van Heur. Synop. 217. pi. 130. /. 4,

7, 8. 1881. Jan. Diat. Gaz. Exped. pi. 2. /. 3, pL 6, /. 3, 7-11. H. L. Smith,

Sp. Diat. Typ. no. 93. 1874. Van Heur. Typ. Diat. Belg. no. 529, 530. Cleve

& M611. type no. 148, 150, 183, 207, 210, 211, 215, 228, 257, 258, 276. Ratt. Proc.

Roy. Soc. Edinb. 16: 461. 1889. De Toni, Syll. Alg. 2: 1210. 1894.
Odantodiacus excentricus Ehrenb. Ber. Akad. Wiss. Berl. 1845: 79. 1846. Schmidt,

JahresD. Konun. Deut. Meere 2: 94. 1874.
Eupodiscus excentricus O'Meara, Quart. Joum. Micr. Soi. 7: 245. pi. 7. / 2. 1867.

Moeb. Diat.-taf. pi. 77. /. 2. 1890.
Chscinodiscus minor Schmidt, Atlas pi. 113. /. 9. 1888.

o Schmidt, Atlas pi. 61./. 7. 1878.

frOp. cit. pi. 67./ 25-27.

c Trans. Micr. Soc. Lond. n. s. 9: 68. pi. 8./ 2. 1861.



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MANN — DIATOMS OP THE ALBATROSS VOYAGES. 253

Coacinodiscuslentiginosus Jan.; Schmidt, Atlas p/. 58. f. 11. 1878; Diat. Gaz. Exped.

jil. 4>f. /-i, pl> 5./: 7. Grun. Denkschr. Akad. Wien 48^:81. 1884. Ratt.

Proc. Roy. Soc. Edinb. 16: 491. 1889. De Toni, Syll. Alg. 2: 1230. 1894.

The extreme delicacy of the markings^ slightly excentric in arrangement, and the

obscurity of the minute spine just within the margin, which are the distinguishing

characters of this species, makes identification difficult. Castracane's form bearing

this name^, seems to lack these marks, and shows nothing to warrant its assignment

here.

Found at station 3613, Bering Sea.

CoBcinodiscus lineatus Ehrenb. Phys. Abh. Akad. Wiss. Berl. 1838: 129. 1840;
1841: 371. pi. 3. VII. /. 7, 8 (not pi. 1. III.J. 20). 1843; Mikrog. pi. 18. f. SS, pi.
i2.}. 6ar-b, pi. S5A. XVI.f.S, pi. 35 A. XVII. f. 7. 1854. KQtz. Bacill. 131. pi.
l.f. 10. 1844. Pritch. Hist. Infus. ed. 4. 830. 1861. O'Meara, Proc. Roy. Irish
Acad. II. 2: 264. 1875. Van Heur. Synop. 217. pi 131. f. 3. 1881. Jan. Diat.
Gaz. Exped. pi. 4> f. 8, pi. 20. f. U. Schmidt, Atlas pi. 59. f. 26-32. 1878;
pi. 114. f. 13. 1888. Cleve & Mdll. types no. 57, 114, 148, 150, 162, 207, 276.
Ratt. Proc. Roy. Soc. Edinb. 16: 472. 1889. De Toni, Syll. Alg. 2: 1216. 1894.
Wolle, Diat. N. A. pi. 87. f. 10. 1890.
Coscinodiscus ehrenbergii O'Meara, Proc. Roy. Irish Acad. II. 2: 264. pi. 26. f. 24.
1875.

Two specimens mounted on one slide, accompanying this report, show how unim-
portant the marginal spines in this species are, one having very large spines and the
other barely a trace of them. The single '* pseudo-process" is present but inconspic-
uous in both.

A figure of Ehrenberg's f> frequently included here is clearly that author's C. excen-
tricus, and in his index to the platesc he gives this figure as ** Coscinodiscus lineatus"^.
an ecceiilricusV^

Found at stations 2680H, 2807, off California and Galapagos Islands.

CoBcinodiBCus xnarginatus Ehrenb. variety (?) Plate XLIX, figure 2.

Ehrenb. Phys. Abh. Akad. Wiss. Berl. 1841: 142. 1843; Mikrog. pi. 18. f. 44. pi

33. XII. f. 13. pi 38B, XXII. f. 8. 1854. Cleve & Moll, types no. 114, 164, 215.

Schmidt. Atlas pi 62. f. 1-5, 9, 11, 12. 1878. H. L. Smith, Sp. Diat. Typ. no.

94, 95. 1874. Ratt. Proc. Roy. Soc. Edinb. 16: 509. 1889. De Toni, Syll. Alg.

2: 1241. 1894 (not C. marginatum Ehrenb.; Ktitz. Bacill. 131. pi l.f. 7. 1844; not

C. niarginatus Ehrenb.; Jan. Abh. Schles. Ges. Vaterl. Cult. 1862^: 3. pi lA.

/. 20. 1862).
Coscinodiscus fimbriatus4imbatus Ehrenb.; Mikrog. pi 19. f. 4. 1854. Schmidt,

Atla*? pi 65. f. 3-6. 1881; pi 113. f. 2. 1888.
Coscinodisnis limhalus Ehrenb. ^ Ber. Akad. Wiss. Berl. 1840: 206. 1841; Mikrog.

pi 20. f. 29 a. 1854. Schmidt, Atlas pi 65. f. 7. 1881.
Coscinodiscus radiatus forma heterosticta Grun.; Pant. Beitr. Bacill. Ung. 1: 70.

pi 20. f. 184. 1886.
Coscinodiscus radiatus subaequalis forma pan^a Pant. Beitr. Bacill. Fng. 1: pi 22.

f. 203. 1886.
Coscinodiscus robustus Grev.; Schmidt, Atlas pi 62. f. 6. 1878.
Coscinodiscus robustus intermedia Grun. Denkschr. Akad. Wien 48^: 72. 1884.
Co8ci7iodiscus subconcavus forma major Schmidt, Atlas pi 62, f. 7. 1878.



aCa8tr.Rep.Voy.Chall.Bot.2: 160. p/. 5./. ^. 1886.
ftPhys. Abh. Akad. Wiss. Berlin 1841: pi /. ///. /. 20. 1843.
cQp. cit. 438.

t'This name as used by Grun. Denkschr. Akad. Wien 48^: 72. 1884= C fimbriatus
Schmidt.



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254 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM.

I have here figured a form common in several dredgings, which, according to pres-
ent interpretations, passes under the above name. I do this in order to illustrate »
confusion in the taxonomy of this spt^cies that should receive attention. Anyone who
will compare Greville's original figure of C. robu9tus<^ with the original figure of
Ehrenberg's C. marginatum f> will s«»e little resemblance between them. Yet Grunow,
Schmidt, Pantocsek, Rattray, and others give no satisfactory marks of distinction,
and we have all sorts of discordant opinions connected with most of the modem
figures. Grunow gives us, on the one hand, a C. robuslus intermedia Grun.<^ which
Rattray makes C. marginatum intermedia Ratt.,^ and on the other hand Grunow
gives a C. marginatum submarginata Grun.,*" which Rattray puta under C. robttstxis
Grev.« Rattray further states that though the original slide of Greville's C. robttstui
is not available, two slides marked by him (Greville) " C. robustum'^ now in the British
Museum are C. marginatum Ehrenb. In view of the foregoing facts I offer the sugges-
tion that someone who has access to the material sift out these forms, and, if neces-
sary, drop Greville's species entirely in favor of Ehrenberg's. The name C mm-
ginatum might necessarily be retained, instead of the earlier C. limbatum, because of
the uncertainty of the two figures Ehrenberg gives for that species./ Under present
conditions no such thing as a positive identification is possible. I have labeled some
specimens that show a narrow border and an al>8ence of radial arrangement, with
obscure or broad papillae* in the hexagons, C robumtum Grev., and others, with broad
and massive borders, somewhat radial and slightly diminishing areolation showing
pronounced papillae, C. marginahim Ehrenb.; but though the best possible under the
present circumstances, these can not be l(X)ked upon as critical identifications.

Diameter of valve here figured, 0.176 nmi.

Found at stations 3361H, 3712H, off Panama and Okhotsk Sea.

CoscinodiscuB nitidulus Grun.; Schmidt, Atlas pi. 58./. tO-il. 1878 (not p/. llS.f.
18. 1888). Van Heur. S>Tiop. pi. hi*. J. 2. 1881. Pant. Beitr. Bacill. Ung. 1:
73. pi. U.J. 214. 188(>. Ratt. Proc. Roy. Soc. Edinb. 16: 480. 1889. De Toni,
Syll. Alg. 2: 1222. 1894. Jan. Diat. Gaz. Exptnl. pi. 5,f. IS.
Found at station 4516H, off Lower California.

CoBcinodiscus nitidus Greg. Trans. Roy. Soc. Edinb. 21: 499. pi. 19. /. 4S. 1856.
Schmidt, Atlas pi. 58. /. 16-19. 1878; Jahresb. Komm. Deut. Meere2: 94. pi. 3.
f. S2. 1874. Pritch. Hist. Infus. ed. 4. 831. pi. 8. f. 18. 1861. Jan. Diat. Gaz.
Exped. pi. 5.f. 12, 14~16 (not /. Li). Pant. Beitr. Bacill. Ung. 1: 75. pi. 18.
/. 166. Van Ileur. Synop. Suppl. pi. C. f. 41. 1885. Wolle, Diat. N. A. pi. 94.
f. 22-2S. 1890. Ratt. Proc. Roy. Soc. Edinb. 16: 478. pi. 1. f. 21. 1889? De
Toni, Syll. Alg. 2: 1221. Cleve &, Moll. t>i3c no. 150, 155, 208, 210, 257, 311.
Cosdnodiscus foraminosiim Grev. MS. in Coll. Brit. Mus.

This and the former species show considerable n^seniblance to certain members of
the genus Stictodiscus.^
Found at station 2807, Galapagos Islands.



o Trans. Micr. Soc. Lond. n. s. 14: pi. l.f. 8. 1866.
& Ehrenb. Mikrog. pi. 18. f. 44. 1854.
cDenkschr. Akad. Wien 48'^: 72. 1884.
rfProc. Roy. Soc. Edinb. 16: 511. 1889.
^Op. cit. 512.

/Ehrenb. Mikrog. pi. 20. f. 29a-b. 1854.

gCi. Schmidt, Atlas pi. 202. f. 4. 1896 and Journ. Quek. Micr. Club II. 8: pi. 5.
/. 7. 1887.



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MANN — DIATOMS OF THE ALBATKOSS VOYAGES. 255

CoBcinodi8Cii8 nobiliB Grun. Joum. Roy. Micr. Soc. 2: 687. pi. 2Uf. 1. 1879. Jan.
Diat. Gaz. Exped. pi. 6./. 13, pi. 2./. 6, unnamed, o De Toni, Syll. Alg. 2: 1266.
1894. Ratt. Proc. Roy. Soc. Edinb. 16: 545. 1889.
Coscinodiscus regim Wall, in Schneider, Beitr. Kennt. Kauk. 27. 1878, Journ.

Roy. Micr. Soc. 2: 687. 1879.
This large and extremely delicate species is close to C. fulgtiralis Brun,'> and to C.
diorama Schmidt; c the chief mark of distinction being the far more rapid increase of
the areolation from the center outward, and the consequently more robust size of the
network in the last-named forms.

Found at stations 2882, 2919, 2923, 2929, 3346, 3712H, 4014H, off Oregon, southern
California, Washington, Okhotsk Sea, and Honshu Island, Japan.

Coscinodiscus nodulifer Schmidt, Atlas pi. 59. f. W-2.S. 1878. Jan. Diat. Gaz.
Exped. pi. J. f. 4-5. Wolle, Diat. N. A. pi. 94. f. 7. 1890. Ratt. Proc. Roy.
Soc. Edinb. 16: 520. 1889. De Toni, Syll. Alg. 2: 1249. 1894. Cleve & Moll, type
no. 57, 155.
Coscinodiscus radiatm Ehrenb. err. det. H. L. Smith, Sp. Diat. Typ. no. 98. 1874.
Rattray erroneously credits the name to Janisch. In both the first and second edi-
tion of Schmidt's Atlas it is credited to Schmidt, as well as in the note of Rattray's in
his revision of the genus,o containing a list of the identifications by Janisch of his
plates of the Gazelle Expedition.

Found at stations 2690H, 2807, 2916H, 2917H, 2920H, 3013H, off California, Gala-
pagos Islands, to Hawaiian Islands.

Coscinodiscus normanni Greg. ; Grev. Quart. Journ. Micr. Sci. 7: 80. pi. 6. f. S. 1859.
Moeb. Diat.-taf. pi. W. f. S. 1890. Ratt. Proc. Roy. Soc. Edinb. 16: 500. 1889.
De Toni. Syll. Alg. 2: 1235. 1894.
Coscinodiscus norniannicus Greg.; Van Heur. Synop. pi. ISl. f. J. 1881; type

no. 532.
Odontodisais suhlilis Grun.; Schmidt, Jahresb. Komm. Deut. Meere 2: 95. 1874.

Van Heur. Synop. 218. 1885.
Coscinodiscus suhlilis Ehrenb.; Eulen. Diat. Sp. Typ. no. 115(cf. Van Heur. Synop.

218. pi. ISl.f. 1. 1881-85).
Coscinodiscus curvatulus Grun. var.; Cleve, in Nordensk. Vega Exped. 3: 488.

1883.
Coscinodiscus fasciailatus Schmidt, Jahresb. Komm. Deut. Meere, 2: 95. pi. S.f. 41.

1874; Atlas pi. 57. f. 9, 10. 1878.
My specimens are with very obscure apiculae or wholly without them, a condition
noted by Rattray. The specimen from station 3669H is placed here with some doubt.
The beads are slightly oval. It is nearest to the unnamed figure,*^ on which Schmidt «
has given reasons for withholding from this species. Rattray erroneously refers a fig.
ure / to this* species to which Janisch gives the name C. atlanticus Grun.,^ which should
probably be C. atlanticus Castr. as figured in the subspecies,^ a form recognized as valid
by Rattray.

Found at stations 2844, 3526, 3571H, 3607, 3669H, Aleutian Islands, Bering Sea,
Pribilof and Commander Islands, and along Kuril Chain.



oCf. Proc. Roy. Soc. Edinb. 16: 462. 1889.

6 Mem. Soc. Phys. et Hist. Nat. Geneva 31^: 21. pi. 21. f. 6. 1891.

c Schmidt, Atlas pi. 64. /. ^. 1878.

d Schmidt, Jahresb. Komm. Deut. Meere 2: pi. S.f. 42. 1874 .

«0p. cit.95.

/Jan. Diat. Gaz. Exped. pi. 5.f. 6.

Q Proc. Roy. Soc. Edinb. 16: 462. 1889.

* Castr. Rep. Voy. Chall. Bot. 2: pi. S.f. 7. 1886.



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256 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM.

CoBcmodiscus obecurus Schmidt, Atlas pi. 61. f. 16-18. 1878. Grun. Denksvxu-.
Akad. Wit'n 4S^: 74. 1884. Ratt. Proc. Roy. Soc. Edinb. 16: 513. 1889. De
Toni, Syll. Alg. 2: 1244. 1894.
Cestodisciis obscunis Van Hour. Synop. pi. U9.f. 4- 1881.

The general cell structure of my specimens agrees well with the above, and ih*-
cliaracteristic minute beads at the inner ends of the semiradial lines are very evident.
They do not appear in the somewhat doubtful photograph of this diatom by Doctor
Woodward. a The specimen from Sendai, Japan, called by Bnin C obscurus floralis,i>
can hardly be classcnl here; the fine bt^aded secondary markings in the hexagon^t and
the absence of a striated border mark them as distinct. Bnin's form is, except for the
coarser marking, nearer to C. fioriduhis Schmidt, which, like the above, has minute
beads at the terminations of the semiradial lines.

Found at station 2844, south of Alaska.'

Cosdnodiscus oculuB-iridis Ehrenb. Phys. Abh. Akad. Wiss. Berl. 1839: 147. 1841;
Mikrog. pi. 18. f. 42, pi 19. / 2. 1854. Jan. Abh. Schles. Ges. Vaterl. Cult. 1862"^:
3. pi. iB.f. 6, pi. 2A.f. 4. 1862. Schmidt, Atlas pi. 63. f. 4 (no name), 6-9. 1S7S:
pi. 113. f. 1, 3-5. 20. 1888. Gnin. Denkschr. Akad. Wien 48*: 77. 1884. Jan.
Diat. Gaz. Exped. pi. t.J. i. Cleve & Mdll. type no. 3, 57, 162, 215, 258. 259. 276.
319. Ratt. Proc. Roy. Soc. Edinb. 16: 559. 1889. Pritch. Hist. Infus. ed. 4. 828.
1861. De Toni, Syll. Alg. 2: 1275. 1894.
Coscinodiscus centralis Ehrenb. Mikrog. pi. 21./. 3. H. L. Smith, Sp. Diat. Typ. no.
91 (not no. 92). 1874.

Rattray unites with the above list C. omphalanthus Grun., c C. asteromphalm Ehrenb., ^
and Cestodiscus radmtus Ehrenb. « 1 do not think these can be classed here. I also
look on Rattray's C. ociili(s-iridlH loeulifera / as of doubtful worth.

Found at stations 2929, 3604, 4530H, off southern California and Bering Sea.

CoBcinodiscus pentas (Ehrenb.) Mann.
Symbolophora pcntas Ehrenb. Rer. Akad. Wiss. Berl. 1844: 205. 1845; Mikrog. pi.

35 A. XXII. f. UK 1854. Griff. & Henf. Micr. Diet. ed. 3. pi. 43. f. S€. 1875.

Ehrenb. Phys. Abh. Akad. Wiss. Berl. 1872: 283. pi. 12. II. f. 1. 1873.
A^ymbolophora Ducrotrias Ehrenb. Ber. Akad. Wiss. Berl. 1844: 205.* 1845; Mikreg.

pi. 35 A, 21. f. 16. 1854. Pritch. Hist. Infus. ed. 4. 833. 1861. Griff. & Henf.

Micr. Diet. ed. 3. pi. 43. f. 55. 1875.
Symbolophora tetras Ehrenb. Ber. Akad. Wiss. Berl. 1844: 205. 1845. Fhrenb.

Phys. Abh. Akad. Wiss. Berl. 1872: 394. pi. 12. II. f. 1. 1873.
Symbolophora heroji Ehrenb. Ber. Akad. Wiss. Berl. 1844: 205. 1845.^
Coscinodisnis .stcUaris Roper, Quart. Journ. Micr. Sci. 6: 21. pi. 3.f. S. 1858. Moeb.

Diat.-taf. pi. 13. f. 3. Pritch. Hist. Infus. ed. 4. 828. pi. 5.f. 83. 1861. C^j^t.

Rep. Voy. (hall. Bot. 2: 155, 158. pi. 3. J. J. pi. 5./. 9. Grove; Schmidt, Atlas



o Van Heur. Synop. pi. 1^9. f. 4- 1881.

feMem. Soc. Phys. et Hist. Nat. Geneva 31': 23. pi. 20. f. 2. 1891.

<- Schmidt, Atlas pi. 63. f. 2. 1878.

d S<»hmidt, KX\'^ pi. 60. J. 7. 1878 and Grun. Denkschr. Akad. Wien 48^: 77. 1884.

e Van Heur. Synop. pi. 129. f. 5. 1881.

/Proc. Roy. Soc. Edinb. 16: pi. l.J. 2. 1889.

9 Symbolophora microtctras Ehrenb., S. micro pentas Ehrenb., and S. jnicrokexat
Ehrenb. Monat^ber. Akad. Wiss. Berl. 1855: 302. 1856, are all nomina nuda. S. trin-
itatis Ehrenb. Ber. Akad. Wiss. Berl. 1844: 88. 1845. Pritch. Hist. Infus. ed. 4.
8:^3. pi. 11. f. 36. 1861. Griff. & Henf. Micr. Diet. ed. 3. pi. 19. f. 6. 1875. Am. Joum,
Sci. 48: pi. 4'f' 1- 1845 is here excluded, as it is an Actinoptychus.



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MANN DIATOMS OF THE ALBATROSS VOYAGES. 257

pi 264. f. 4. O'Meara, Proc. Roy. Irish Acad. II. 2: 261. 1875. Ratt. Proc.
Roy. Soc. Edinb. 16: 493. 1889. Grun. Denkschr. Akad. Wien 48»: 82. 1884.
De Toni, Syll. Alg. 2: 1231. 1894.

Cosdnodiscus symbolophorus Grun. Denkschr. Akad. Wien 48*: 82. pi. 4- f- S-6.
1884. Ratt. Proc. Roy. Soc. Edinb. 16: 492. 1889. Schmidt, Atlas pi. 138./.
1-5. De Toni, Syll. Alg. 2: 1230. 1894.

I include in this species a large number of varieties found in the various dredgings
an4 soundings named. I am convinced that there is no reasonable ground for Gni-
now's C. symholophorus as distinguished from Roper's older name C. sUllaris. Grunow
admits that the difference is one of relative fineness of marking — too slight a character
for creating a new species, especially when this difference is by no means striking
and many intermediate forms are obtainable. Both have the same relative convex-
ity of valve; the same striking stellate cluster at the center; the same arrangement of
fine beading, namely, in fascicles whose component rows are parallel to the Icmgest
radial middle row. By thus abandoning the untenable distincticm separating these
two we have a sharply defined species, its nearest relative being C. suhtilis Ehrenb.,
from which it is distinguished by the stellate marking of the center and the absencv.
of minute processes next the Ixjrder. The older specific names of Ehrenberg given
above under the now-abandoned genus Symbolophora take precedence over those of
Grunow and Roper. I have selected S. pentas, published simultaneously with S.
microtrias and S. tetras^ because I have found the five-parted star at the center to be
more common than the rest and because Ehrenberg's illustration cited above is quite
satisfactory.

Found at stations 2807, 2848, 2859, 2860, 2919, 3346, 3361II, 3603, 3604, 3604H,
3671, 4029H, Galapagos Islands, off Alaska peninsula, off British Columbia to south-
em California and Bering Sea.
CoBcinodiscus pustulatus Mann, sp. nov. Plate XLVTII, figure 3.

Valve strongly and evenly convex, covered with large conical (not hemispherical)
beads, symmetrically arranged in decussating rows, as in C. symynetricus Grev., the
largest at the center and regularly decreasing to the l)order, but terminating just
within the border in a single row of increased size; border broad, stout, and hyaline.
The heavy cone-shaped beads give a remarkable brilliancy to the diatom.

Diameter of valve, 0.1 mm.

Type in the IT. S. National Museum, No. 590156, from station 356511, Bering Sea,
July 6, 1895; 1,866 fathoms, bottom of blue mud (K)ze.

It should be here noted that what resembles a pseudonodule near the l^order in the
photograph herewith reproduced is, together with thr(»e flecks near the center, due
to defects in the negative.

CoscinodiBCUS radiatus Ehrenb. Phys. Abh. Akad. Wiss. Berl. 1839: 148. pi. 3. f.

la-c (not d.). 1841; Mikrog. pi. 19. f. 7, pi. 22. f. 3, pi. S3. XIIL /. 2 (not 2*),

pi. 33. XVI.f. (5, pi. SoA. XVII.f. 6 (doubtful=pZ. 20. I.f. 21, pi. 21. J. 1). 1854.

Pritch. Hist. Infus. ed. 4. ^30. pi. 11. f. 39, 40. 1861. Schmidt, Atlas pi. 60. f.

5, 6, 9, 10, pi. 61. f. 13 (undetermined). 1878; pi. 6r). f. 8 (no name). 1881; pL

lis. f. 8, 15 (no name). 21. 1888. Schmidt, Jahresb. Komm. Deut. Meere 2: 94.

pl.S. f. 34. 1874. Grun. Denkschr. Akad. Wien 48^: 71. pi. 3./. 1-4, 7. 1884.

Cleve & M611. types no. 57, 114, 155, 164, 207, 211, 215, 257. Van Ileur. Synop.

pi. 129. f. 1. 1881. Castr. Rep. Voy. Chall. Bot. 2: 165. pi. 29. f. 2, 11, 15. 1886.

Ratt. Proc. Roy. Soc. Edinb. 16: 514. 1889. De Toni, Syll. Alg. 2: 1244. 1894.

(exclude here C. radiaim Bail. Am. Joum. Sci. 42: 95. pi. 2.f. 14. 1842; also C.

radiatus Weisse, Bull. Acad. St. Petersb. 12: 122. pi. I.f. 25. 1868).
Coscinodisnu caspius Ehrenb. Phys. Abh. Akad. Wiss. Berl. 1872: 394. pi. 12. I.f.

14. 1873.
Cosdnodiscus horealis Ehrenb. Monatsber. Akad. Wiss. Berl. 1861: 294. 1862, not

C. horealis BaU. Am. Joum. Sci. 22: 3. 1856.



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258 CONTRIBUTIONS FBOM THE NATIONAL HERBARIUM.

Coscinodwcus denus Schmidt, Atlas pi. 60. /. 1-4. 1878. Van Heur. Synop. pi. ISO,

f. S. 1881. Cleve & M6ll. type no. 150.
Coscinodiscus fallwr Schum. Schrift. Phys. Okon. Gesell. Konigsb. 8: 62. pi. S,f.

76. 1867 (cf. Castr. Rep. Voy. Chall. Bot. 2: 165. pi. 29. f. 2, 11. 15. 1886).
Rattray includes under the alK)ve category several references,** which are omitted
here.

Found at stations 2807, 3604, 2835, Galapagos Islands, ofif Lower California and
Bering Sea.

CoednodiBcua robuatua Grev. Trans. Micr. Soc. Lond. n. s. 14: 3. pi. l.f. S. 1866.
Moeb. Diat.-taf. pi. 70. f. 8. 1890. Jan. Diat. Gaz. Exped. pi. 4 J- 10-11. Sckmidt,
Atlas pi. 62. f. 16, 17 (not /. 1-6). 1878. Grun. Denkschr. Akad. Wien «^: 72.
1884. Ratt. Proc. Roy. Soc. Edinb. 16: 511. 1889. De Toni, Syll. Alg.«f 1243.
3894. Plate XLVIII, FietJliE 4.

CoscxTwdiscxa snhvelatus Grun.; Schmidt, Atlas pi. 65, f. 9. 1881.

Coscinodiscus marginahis Ehrenb. var. Grun. Denkschr. Akad. Wien 48*: Tf. 1884.

Coscinodisnis hinkerianus Truan & Witt, Diat. Hayti 13. pi. S.f. 1. 1888.

Greville's figure and its reproduction cited above by Moebius are, as Rattray {x>ints
out. somewhat idealized. A variety was found at station 3399H corresponding to the
one that Schmidt & considerH doubtful. C. subvelatus Grun. is also a rather too diver-
gent variety, while C. Hnkeriamis Truan & Witt is either a variety with unusually
narrow margin or a type form with margin wanting. The confusion between thia
species and C. marginatus Ehrenb. has been discussed under that heading.

Found at stations 3346, 3361II, 3399H, 3604, 3663H, 3693H, 3784, 3785, 4023H,
4025H, off Washington, Bering Sea and Okhotsk Sea.

In Rattray's revision*" occurs this paragraph: '*In a Santa Monica form, 13 mm. in
diameter, discoven»d by D(>(tx)r Rae, the usual striated border was surrounded by a
second more sharply defined but narrower band, with a slightly convex surface, and
bearing delicate striae, 8 to 10 in 0.01 mm. At one place this band is interrupted and
somewhat more convex on the two sides of the break. This gives it the appearance
of an <*lastic spring enveloping the valve." Specimens of this structure are not
infrequent at station 3361 H, which is in Bering Sea northwest from Pribilof Islajids.
At station 4025H, a little north of the Aleutian Islands, it is decidedly abundant.
Nor is such a band confined to thus species. Brun d figures precisely this condition
on a specimen of (\ crasms Bail. It would be interwting to know the precise
physiological signification of this feature, its only occasional presence in the different
sp(H-i(\s implying that it has such signification. Figures of this form and a morpho-
logical discussic**! of the interrupted diatom girdle have been published by Palmer &
K(H»ley.^ The form found at station 4025H is represented in the accompanying
figure.

CoBcinodiacuaaimbirakianuB Grun. Denkschr. Akad .Wien 48^: 81. 1884. Schmidt,
Atlas pi. lis. f. 11-U. 1888. Ratt. Proc. Roy. Soc. Edinb. 16: 489. 1889. De
Toni, Syll. Alg. 2: 1228. 1804.
My specimen is a typical example of this unusual species. As the sounding in

which it occurred was made off the coast of Alaska, and as the only places heretofore

"Ehrenb. Mikmg. pi. 3.3. XTII.f. 2*. Schmidt, Atlas pi. 62. f. 18. 1878. H. L.
Smith, Sp. Diat. Typ. no. 99. This last is pn)bably an error. No. 99 is marked
C. svidtillaiis Grev., and contains no example of C. radiatus. No. 98 is marked C.
radiatus Ehrenb., but is wrong. It is C. nodulifer Schmidt.

b Schmidt, Atla.s pi. 62. f. 1. 1878.

c Proc. Roy. Soc. Edinb. 16: 512. 1889.

dMem. Soc. Phys. et Ilipt. Nat. Geneva 31': pi. 20./. 3. 1891.

«Proc. Acad. Phila. 1900: 465-479. pi. 15-16. 1900.



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MANN DIATOMS OF THE ALBATKOS8 VOYAGES. 259

reported where it has been found are in Russia (i. e. Simbrisk, Ananino, and Arch-
angelflk-kvirojedowo), it would be interesting to know the geological outcrop that
fumifihed tbis<«pecimen. - -

Found at station 3361H, Bering Sea.

Coscinodiscos subtUia Ehrenb. Phys. Abh. Akad. Wiss. Berl. 1841: 412. pi 1, TIL
f. 18, pi 3. VII. f. 4. 1843: Mikrog. pi 18. f. S5, pi SS. XIII /. 4, pi SS, XVLf,
7, pi M. VU.f. 6, pi S5. XXII f. 5, pi 35. XXIII.f. 5. 1854. Ehrenb. Phys.
Abh. Akad. Wiss. Berl. 1841: 438. pi 1. III. f. 18. 1843. Grev. Quart. Joum.
Micr. Sci. 7: 81. 1859. Pritch. Hist. Infus. ed. 4. 830. 1861. Jan. Abh. Schl.
Ges. Vaterl. Cult. 1862^: 4. pi lA.f. 2, 1862. Jan. Diat. Gaz. Exped. pi i.f. 8.
Schmidt, Atlas pi 57. f. 11-16. 1878. H. L. Smith, Sp. Diat. Typ. no. 100.
Ratt. Proc. Roy. Soc. Edinb. 16: 494. 1889. De Toni, Syll. Alg. 2: 1232.
1894 (exclude Ehrenb. Phys. Abh. Akad. Wiss. Berl. 1841: 443. pi 3. VII. f. 4.
1843. Grun. Denkschr. Akad. Wien 48^: 81. pi 3. f. 26, 1884. Ehrenb.
Mikrog. pi 22. f. 4. 1854).

Rattray has included here several references which are very questionable.^ The two



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