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Philip P. (Philip Pearsall) Carpenter.

The mollusks of western North America online

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235



2 Dr. P. P. Carpenter on new Forms of Mollusca

dm eleganter variegata ; striis increment! concentricis, postice ex-
tantioribus ; umbombufl postice flectentibus, obtusis ; |)arte antica
prolongata, regulariter excurvata ; marginibus dorsali et ventrali
subparallelis, subrectis ; parte postica curtiore, subangulata : intus,
dent. card, utraque valva ii. minutis, quorum alter bifidus ; v.
dext. dent, lat., ant. curto, satis extante, post, nullo ; nymphis
curtis, latis, parum concavis, subito sectis, valvis postea subalatis ;
sinu pallii fere cicatr. aiit. tenus porrecto. Long. */2, lat. '42,
alt. -15.

Hab. Neeah Bay (Swan) ; Monterey and Catalina Island,
20-60 fathoms, rare (Cooper).

Submenus MIODON*.

Testa Lucinoidea, dentibus cardinalibus, ut in Cardita, elongatis ;
lateral! antico parvo instructa.

This little group of species is intermediate in character be-
tween Astarte, Venericardia, and Lucina. It first appears in
the Great Oolite, where it is represented by Astarte (Miodon}
orbicularis, J. Sby. Min. Conch, pi. 444. f. 2/3. This must* not
be confounded with a second and true Astarte orbicularis, by the
same author, pi. 520. f. 2. It appears in Mr. Searles Wood's
Crag-senes as Astarte corbis. The following is the only recen,t
species at present known.

9. Miodon prolonaatus.

M. testa parva, solida, tumida, compacta, albida; ventraliter antice
valde prolongata, excurvata ; lunula longa, rectiore, haud irnpressa;
umbonibus antice inflectis, obtusis, valde prominentibus ; margine
dorsali postico parum excurvato ; costis radiantibus x.-xii. latis,
obtusis, marginem attingentibus, parum expressis, dorsaliter obso-
letis, a liris increment! concentricis, plus minusve distantibus, ex-
pressis, hie et illic interrupts : intus, margine a costis plus minusve
obsoletim crenulato ; cardine dentibus v. dextr., uno postico, inter
duas fossas elongato, et lat. ant. lunulari; v.sinistr., dent. ant. trian-
gulari, post, valde elongato, lat. ant. minimo, obsolete ; cicatr. add.
subrotundatis, ventraliter sitis. Long. '23, lat. '24, alt. -16.
1

Subgenus ADULA, Add. (diagn. auct.).

Testa 'inter Modiolam et Lithophagum intermedia, cylindracea ;
umbonibus obtusis ; parte antica longiore ; ligamento subinterno,
valde elongato ; epidermide haud testacea.

Animal byssiferum, in cryptis affixum ; musculis adductoribus
majoribus, antico ovato.

Constituted by Messrs. Adams for A. soleniformis, D'Orb.,
which very closely resembles the young of the Vancouver species :
enlarged to receive the shells of Lithophagoid shape which are

* Th. (jifivv, smaller ; o8ovs, tooth.

236



from the Vancouver District* 8

moored by byssus, like Modiola. The largest known species is
A.falcata, Gld., which is normally straight, but often grows in
a twisted burrow. A. parasitica, Desh., and the long-known
A. cinnamomea appear congeneric.

13. Adula stylina.

A. testa cylindracea, lithophagoidea, Isevi, termissima, parum ar-
cuata, subnacrea, albida, postice interdum livido tincta ; epider-
niide nitente, Isevi, solidiore, nigro-fusca : testa jun. typice modio-
Jseformi, umbonibus subanticis, obtusissimis ; margine dorsali
antice (rarissime paululum, testa minima, postice) tenuiter crenu-
lato : testa adulta marginibus dors, et ventr. fere parallelis, ant.
et post, rotundatis ; umbonibus detritis, baud conspicuis, circiter
sextantim antice sitis ; incrustatione baud solida, densissime spon-
giosa, aream posticam diagonalem tegente, supra valvas prolongata,
appressa ; ligamento interne, postice valde prolongato ; pagina
interna pallida ; cicatr. add. postica tumida, pyriformi, antica
(quoad familiam) maxima, baud impressa, oblonga ; cicatr. pedali
antica magna, circulari, impressa ; callositate subumbonali (testa
jun.) cicatr. pedalem versus conspicua. Long. '155, lat. *4, alt. *5.

Variat t. magis arcuata ; ut in A. falcata, antice tumidiore, sub-
angulata.

Tariat quoque testa attenuata.

Variat interdum ventraliter late hiante.

Hob. Neeab Bay, abundant (Swan] ; Monterey (Taylor).

On smashing a large lump of hard clay, bored by Pholads,
Petricolids, &c., large numbers of this species, with a few of A.
falcata, of all ages from '06 onwards, were found in situ. Several
struggled for room in a single crypt. The umbos are abraded
by the wide opening of the valves.

14. Axinaa (fseptentrionalis, var.) subobsoleta.

A. testa A.septentrionali sirnili, parum insequilaterali, baud tumida;
umbonibus obtusis, latis, satis prominentibus ; cinerea, rufo-cas-
taneo varie picta ; epidermide copiosa, sublaminata ; marginibus 1
ventral! et postico valde rotundatis, antico parum producto, dor-
sal! recto ; sulcis radiantibus subobsoletis sculpta, dorsaliter ssepe
evanidis : intus, marginibus ventral! valde, ant. et post, parum cre-
natis ; lamina cardinis subangulata ; dentibus paucioribus, validis,
angustatis ; cicatr. add. antica castanea, callosa ; ligamento su\-
cato. Long. -13, lat. '12, alt. '7.
Hab. Neeah Bay (Swan) ; Shoal water Bay (Cooper).

Midden dorfFs shell is figured with much stronger ribs, but
may have been described from decorticated specimens.

15. Siphonaria Thersites.

S. testa parva, tenui, baud elevata, valde insequilaterali, dense nigro-
castanea, laevi, seu interdum costulis paucis, obtusis, obsoletis,

237



4 Dr. P. P. Carpenter on new Forms of Mollusca

radiatim vix ornata; epidermide Inevi, tenui, fugaci; costa pulino-
nali intus et extus valde conspicua, turnente ; vertice obtuso,
plerumque ad quadrantem, interdurn ad trientern totius longitu-
dinis sito ; intus intense nigro-fusco, margine acuto. Long. '40,
lat. -33, alt. - 1 /.

Hab. Neeah Bay (Swan).

This genus, which culminates in western tropical America and
at Cape Horn, is not known in California. The Vancouver spe-
cies resembles S. lateralis and its congeners, but differs in having
an enormous lung-rib and no colour-rays.

16. Mopalia (Kennerleyi, var.) Swannii.

M. testa M. Kennerleyi typicse simili, sed jugo fornicato, haud cari-
nato ; omnino rubida, sculptura mult > minus expressa ; areis late-
ralibus vix definitis ; latera versus subgranulata ; dorsum versus
lineis jugum versus procedentibus, interstitiis punctatis ; sinu
postico latiore ; limbo pallii lato, coriaceo, vix piluloso. Long.
2-4, lat. 1-, div. 120.

Hab. Tatooche Island (Swan).

23. Margarita Cidaris, A. Ad.

M. testa magna, conica, Turcicoidea, tenui ; albido-cinerea, nacreo-
argentato; anfr. nucleosis?...(decollatis), norm, vii., subplanatis j
suturis alte insculptis ; superficie spirse tota valide tuberculosa,
seriebus tribus, alteris postea intercalantibus ; peripheria et basi
TOtundatis, carinatis ; carinis circ. viii., haud acutis, irregularibus,
scabris, haud tuberculosis ; lacuna umbilicali vix conspicua ; aper-
tura subrotundata ; labro tenuissimo ; labio obsolete ; columella
arcuata. Long. Tl, long. spir. '65, lat. '75, div. 60.
Hab. Neeah Bay (Swan).

Mr. A. Adams suggested the above expressive name for this
very remarkable and unique shell.

25. Gibbula parcipicta.

G. testa solidiore, parva, conica, pallida, purpureo-fusco varie nebu-
losa et maculata ; anfr. v., rotundatis ; carinis ii. validis in spira
se monstrantibus, minore intercalate ; interstitiis subsuturalibus,
subleevibus, inter carinas obtuse decussatis ; lira peripherica de-
finita, saepe in spira se monstrante ; basi valde rotundata ; lirulis
basalibus circ. v. rotundatis, subdistantibus ; apertura subcirculari;
columella arcuata ; umbilico majore, infundibuliformi, haud angu-
lato. Long. '14, long. spir. *07, lat. *13, div. 70.
Hab. Neeah Bay (Swan) ; Santa Crux (Rowell) .

26. Gibbula succincta.

G. testa parva, subelevata, solidiore; livida, testa juri. strigis angustis,
creberrimis, fusco-purpureis penicillata, testa adulta maculis quo-
que magnis nebulosa ; anfi'. v., subquadratisj liris obtusis medianis

238



from the Vancouver District. 5

et striis subobsoletis cincta, suturis valde impressis ; basi rotun-
aata, obtuse angulata, striis ssepe evanidis spiralibus ornata, tesra
adulta circa umbilicum magnum, infundibuliformem, vix angu-
laturn, scepe tumidiore, medio obtuse impressa; apertura sub-
qmidrata, parum declivi ; columella subarcuata. Long. '16, long,
spir. -07, lat. -10, div. 70.

Hub. Neeah Bay (Swan] \ Lower California, on Haliors
(Rowell).

27. Gibbula lacunata.

G. testa parva, fusco-purpurea, solidiore ; marginibus spirse \alde
excnrvatis ; anfractibus nucleosis normalibus, postea iv. subpla-
natis, suturis distinctis, apice mamillato ; sublsevi, circa basin
vix angulatam striolata, striolis spiralibus distantibus ; apertura
suborbiculari, parum declivi ; labio juxta umbilicurn constrictum,
quasi lacunatum, lobato ; columella callositate parva umbilicum
constringente. Long. *11, long. spir. '05, lat. *11, div. 80.

Hab. Neeah Bay (Swan).

28. Gibbula funiculata.

G. testa parva, elevata, compacta, fusca; marginibus spirse excur-
vatis ; anfr. vi., baud tumidis, suturis parum impressis ; lirulis
crebris rotundatis undique cincta, quarum v. in spira monstrantur;
interstitiis parvis ; basi rotundata, baud angulata ; umbilico parvo,
baud carinato ; apertura suborbiculari, parum declivi ; columella
vix arcuata. Long. '24, long. spir. '11, lat. '2, div. 70.

Hab. Neeah Bay (Swan), specimen unicum.

29. Hipponyx cranioides.

II. testa valde planata, majore, albida; vertice nucleoso? ... ; testa
adulta apice interdum subcentrali, ssepius plus minusve postico ;
laminis increment! confertis, undique rapide augentibus ; striis
radiantibus fortioribus, confertissimis, laminarum margines ssepe
crenulantibus ; margine acuto ; cicatr. muse, angusta, margini
contigua, regione capitis minore, ssepe dextrorsum torsa ; epi-
dermide?.. . Long. '85, lat. '75, alt. -3.

Hab. Neeah Bay (Swan).

30. Bivonia compacta.

U. testa satis magna, ssepe solitaria, purpureo-fusca, spiraliter ple-
rumque satis regulariter contorta, obsoletim cancellata seu sculp-
tura fere evanida ; testis tenacissime adhserente. Long, (plerum-
qne) *7, lat. *3, diam. apert. !.

Hab. Barclay Sound; abundant on Pachypoma gibberosum
(Swan).

Belongs to Bivonia, Gray (not Morch). Has the aspect of
Petaloconchus macrophragma on a large scale, but is entirely
destitute of internal laminae. One specimen had a faint colu-

239



6 Dr. P. P. Carpenter on new Forms of Molfasca

mellar thread for two whirls only. Operculum normal, with
thin edge, dark red.

32. Lacuna porrecta.

L. testa L. puteolo simili, sed multo majore, spira magis exserta;
seu omnino fusca, seu zona pallidiore, seu pallida lineolis fusces-
centibus tenuissime spiraliter ornata ; epidermide tenuiter striata
olivacea seu viridescente induta; tenuiore, spiraliter tenuiter striata;
anfr. v., vix planatis, rapide augentibus, suturis itnpressis, vertice
mamillato ; apertura tumente ; labio tenui, vix parietem attingente,
intus subrecto ; lacuna maxima, elongata, ad basin arcup.ta ; peri-
pheria expansa. Long. '52, long. spir. '2, lat. '4, div. 80.
?Var. effusa : testa L.porrectce simili, sed multo majore ; spira elevata,
satis effusa ; anfr. tumidioribus, suturis valde irnpressis ; aperturam
versus magis expansa. Long. *65, long. spir. '25, lat. *5, div. 60.
?Var. excequata : testa L. effusa simili, sed anfr. planatis, suturis
parum impressis. Long. '5, long. spir. '2, lat. '42, div. 80.
Hab. Neeah Bay (Swan).

The form L. exaquata is intermediate between the very dif-
ferent L. porrecta and L. effusa. The Lacuna vary so much
(vide Forbes & Hanley in loco) that, even with a large multitude
of specimens, it is not easy to state what constitutes a species.

33. Lacuna (? solidula t var.) compacta.

L. testa L. solidulce, var., simili ; parva, solida, compacta, angusta,
subturrita, marginibus spirae excurvatis : aurantiaca, interdum pal-
lidiore zonata ; anfr. subplanatis, suturis distinctis ; tota superficie
confertissime spiraliter striolata ; basi valde angulata, subplanata ;
apertura subquadrata; columella vix lacunata. Long. *23, long,
spir. -1, lat. -17, div. 60.

Variat testa elongata : variat quoque columella normaliter lacunata,
Hab. Neeah Bay (Swan).
Possibly an extreme form of the very variable L. solidula, Lov.

(= L. carinata, Gld., non A. Ad., = Modelia striata, Gabb), yet

distinct in all ages. The young shells resemble small Litorince.

34. Lacuna variegata.

L. testa tenui, plus minusve elevata, soluta, irregulari ; adolescente
fusco-purpureo ; adulta livida, radiatim seu diagonaliter varie ir-
regulariter strigata, strigis fusco-aurantiacis, ssepe ziczacformibus ;
anfr. vi., quorum primi compacti, apice submamillato ; deki solutis,
postice planatis, antice expansis ; basi rotundata seu angulata ;
apertura subovata ; labro postice porrecto ; labio ssepe parietem vix
attingente ; columella intus recta, extus valde lacunata. Long. '6,
long. spir. -16, lat. -17, div. 50.
Hab. Neeah Bay (Swan).
Painted like L. decora ta, A. Ad., which differs in having a

normal growth, with very slight cbink.

240



from the Vancouver District. 7

35 . Isopis fenestrata .

I. testa I. ovoidece forma et indole simili ; carinis ix. acutis (quarum
iv.-in spira monstrantur) cincta ; interstitiis duplo latioribus, con-
cinne quadratim decussatis, liiulis radiantibus acutissimis ; anfr.
postice tumentibus, suturis valde excavatis ; peritremate continue ;
labro a carinis pe&tinato ; labio parietern parum attingente, medio
calloso ; umbilico angusto. Long. *18, long. spir. '13, lat. "19,
div. 70.

Hab. Neeah Bay (Swan) ; S. Diego and Sta. Barbara Island
(Cooper).

Dr. Cooper's shells are much smaller than those from the
Vancouver district, which are white and eroded, varying much
in the size of the umbilicus.

36. Alvania reticulata.

A. testa parva, subturrita, rufo-fuscn, marginibus spirse rectis ; anfr.
imcleosis ii. et dimidio, naticoideis, laevibus, tumentibus, apice
mamillato ; norm, iii., tumidis, suturis impressis ; liris angustis,
distantibus, spiralibus circ. xii. (quarum iv.-vi. in spira mon-
strantur), et lirulis radiantibus, supra transeuntibus, hand nodulosis,
secundum interstitia incurvatis, eleganter exsculpta ; interstitiis
altis, quadratis ; peritremate continue, subrotundato, acutiore.
Long. -085, long. spir. '05, lat. '04, div. 30.

Hab. Neeah Bay; two specimens in shell-washings (Swan).

37. Alvania flosa.

A. testa A. reticulates indole et colore, haud sculptura, simili ; multo
majore, elongata ; anfr. nucl. ?... (detritis), norm. iv. ; striis parum
separatis circ. xviii. (quarum cir. xii. in spira monstrantur) cincta ;
rugulis radiantibus posticis creberrimis, haud expressis, circa peri-
pheriam evanidis ; peritremate continue ; columella rufo-purpureo
tincta. Long. '13, long. spir. '09, lat. '06, div. 20.

Hab. Neeah Bay; one specimen in shell-washings (Swan).

38. ?Assiminea subrotundata.

1A. testa haud parva, Isevi, tenui, fusco-olivacea ; anfr. nucl. ?...(fle-
collatis) ; norm, v., rapide augentibus, subrotundatis; marginibus
spiree rectis, suturis valde impressis ; basi rotundata, haud umbili-
cata ; apertura rotundato-ovali, intus fuscescente ; peritremate
continuo; labro acute; labio parum calloso; columella arcr.e..'u.
Long. -28, long. spir. '13, lat. '2, div. 65.

Hab. Neeah Bay; one specimen among Lacuna (Swan).
May prove to be a large Hydrobia.

39. tPaludinella casianca.

?P. testa compacta, solidiore, fu.scu-cciatauen, niargiuibns :D\TK rec-
16 '241



8 Dr. P. P. Carpenter on new Forms of Mollusca

tioribus ; rugulosa, lineis distantibus spiralibus irregulariter in-
sculpta ; anfr. nucleosis ?. . . . (detritis), vertice late mamillato ;
norm, iv., rapidius augentibus, tumidioribus, suturis satis im-
prcRis; basi ipgulariter excurvata, vix rimata ; apertura suborbi-
cnlari, baud continua ; labro acuto ; labio supra parietern obsolete,
supra columellam arcuatam in) us cnlloso : operculo, anf r . iv, Kvid
rapide augentibus. Long. *2l, long. spir. '09, lat. *17, div. 70.

Hab. Neeah Bay ; one specimen among Lacuna (Swan).
May be an aberrant Assiminea.

40. Mangelia crebricostata.

M. testa tereti, rufb-fusca, albo zonata ; anfr. micl. ? . . . (decollatis) ;
norm. v. elongatis, subrotundatis, suturis impressis ; costis radi-
antibus, obtusis, subrectis, circ. xv., spiram ascendentibus ; sculp-
tura spirali ? . . . (detrita) ; apertura pyriformi, antrorsum in ca-
nalem brevem attenuata ; labro postice parum sinuato ; labio con-
spicuo. Long. *54, long. spir. *3, lat. '2, div. 28.

Hab. Neeah Bay; 1 specimen (Swan).

41. Mangelia inter fossa.

M. testa parva, valde attenuata, rufo-fusca, marginibus spirse parum
excurvatis ; anfr. nucl. ii., ut in Chrysodomo irregularibus, apice
mamillato ; norm, vi., parum excurvatis, baud tabulatis, suturis
distinctis ; costis radiantibus circ. xv., angustis, extantibus ; cos-
tulis spiralibus circ. xv.,quarum circ. v. seu vi. in spira monstrantur,
angustis, supra costas transeuntibus, ad intersectiones parum no-
dulosis ; interstitiis altis, quadratis ; basi effusa ; apertura sub-
pyriformi ; labro acuto, postice vix emarginato ; labio tenui.
Long. -38, long. spir. '22, lat. '13, div. 25.

Hab. Neeah Bay; very rare (Swan).

42. tMangelia tabulata.

?37. testa parva, solidissima, luride rufo-fusca, marginibus spirae ex-
curvatis ; vertice nucleoso chalcedonico (eroso) ; anfr. norm, v.,
postice rectangulatim tabulatis, suturis impressis; costis radianti-
bus circ. xvi., validis, obtusis, circiter basim attenuatam obsoletis ;
costis spiralibus in spira iii.-iv. angustis, extantibus, supra cost,
rad. nodosis ; interstitiis alte insculptis, subquadratis ; costis circa
basim circiter vii., quadratirn extantibus, interstitiis a lineis incre-
menti vix decussatis ; canali curta, aperta ; labro acutiore, ad an-
gulum posticum vix sinuato ; labio tenui ; columella obsolete uni-
plicata. Long. '45, long. spir. '26, lat. *2, div. 35.

Hab. Neeah Bay; several worn specimens (Swan).

The distinct fold near the base of the pillar may require the
formation of a new genus.

242



from the Vancouver District. 9

43. tDaphnella effusa.

?D. testa gracillima, maxime effusa, rufo-fusca ; anfr. angustis, elon-
gatis, suturis impressis ; striis spiralibus crebris a lineis incre-
ment! decussatis ornata ; labro tenuiore, postice vix sinuato.
Long. -65, long. spir. '45, lat. '22, div. 30.

Hab. Neeah Bay; one broken specimen (Swan).

44. Odostomia satura.

O. testa magna, alba, laevi, solidiore, satis elevata ; anfr. nucl. ii.,
aiigustis, subplanorboideis, valde decliviter sitis, dextrorsum im-
rnersis, sinistrorsum extantibus; norm, v., turnidioribus, regula-
riter convexis, suturis impressis ; basi rotundata, tumente, quasi
umbilicata ; apertura ovata ; labro vix sinuato ; labio tenui, ap-
presso ; plica columellari valida, subantica, parieti hand contigua,
transversa. Long. -26, long. spir. '14, lat. '13, div. 40.
Hab. Neeah Bay; rare (Swan).

Var. pitpiformis : anfr. primis valde depressis, planatis ; vertice
mamillato ; anfr. ult. normali. Specimen unicum, quasi monstru-
osum. Long. '19, long. spir. !, lat. *12, div. 45.

44 b. Odostomia (?var.) Gouldii.

O. testa solida, alba, ovoidea, marginibus spirae valde excurvatis ;
vert. nucl. decliviter immerso ; anfr. norm, v., subplanatis, suturis
valde impressis ; peripheria baud angulata ; basi excurvata, baud
tumicla; apertura ovata, postice parum constricta; labro solido ;
labio conspicuo, rimam umbilicalem for m ante ; plica submediaria,
solida, extante, baud declivi. Long. '23, long. spir. -13, lat. !,
div. 30.

Hab. Neeah Bay; very rare (Swan).

Agrees in some respects better with the diagnosis of 0. gra-
vida, Gould, than do Col. Jewett's shells, from which it is pre-
sumed the species was described. These large forms appear
very variable.

45. Odostomia nuciformis. .

O. testa magna, compacta, laevi, solida, alba ; anfr. nucl.? . . . (erosis),
vertice submamillato ; anfr. norm, v., subplanatis, subelongatis ;
spira brevi, marginibus valde excurvatis ; basi elongata, haud um-
bilicata ; apertura subovali, postice angusta ; labro solido ; labio
tenui ; plica antica, solida, obtusa, transversa, parietem haud attin-
gente. Long. '3, long. spir. '14, lat. '18, div. 70.
Hab. Neeah Bay; extremely rare (Swan).

45 b. Odostomia (? var.) avellana.

0. testa O. nuciformi indole simili, sed spira valde prolongata.
Long. -32, long. spir. -16, lat. -16, div. 50.
Hab. Neeah Bay ; one specimen (Swan),
Like a gigantic form of O. conoidalis.

243



10 Dr. P. P. Carpenter on nsw Forms of Mollusca

47. Odostomia tenuisculpta.

O. testa ovoidea, subelevata, albida, tenui, diaphana ; anfr. nucl.
subverticaliter immersis, angustis ; norm, iii., parum tumidis, su-
turis impressis, sulculis spiralibus latioribus baud impress!?, dis-
tantibus, in spira iii., circa basirn rotundatam circ. vi. subobso-
letis ; apertura ovata ; plica acuta, declivi, parva, parieti contigua ;
labro acuto ; labio indistincto ; columella antice parum effusa.
Long. !, long. spir. '04, lat. '06, div. 60.

Hob. Neeab Bay; one specimen (Swan).

48. Scalaria Indianorum.

S. testa gracili, turrita, alba ; anfr. circ. x., rotundatis, parum sepa-
ratis, leevibus ; basi simplici, baud uinbilicata ; costis viii.-xv.
(pleiumque xii.), acutioribus, subreflexis, interdum latis, plerumque
lineis irregularibus margini spirse recto parallelis ascendentibus,
rarius juxta suturam subnodosis ; apertura ovata. Long. 1*05,
long. spir. '8, lat. -36, div. 28.

Hab. Neeah Bay (Swan).

Strung as ornaments by tbe Indian cbildren. Intermediate
between S. communis and S. Turtonis, and scarcely differs from
" S. Georgettina, Kien.," Mus. Cum. no. 34, Brazil.

486. Scalaria (t Indianorum, var.) tincta.

S. llndianorum costis acutis, baud reflexis ; anfractibus postice fusco-
purpureo tinctis.

Hab. Cerros Island (Ayres) ; S. Pedro (Cooper}.

The Lower-Californian sbell may prove distinct. It is like
S. regularis, Cpr., but witbout the spiral sculpture.

Submenus OPALIA, H. & A. Ad. (diagn. auct).

Scalarice varicibus obtusis, irregularibus, parum defmitis : sculp-
tura basim versus interrupta.

Ex. in Mus. Cum. : O. crassicostata, O. crassilabrum, 0. dia-
dema, O.funiculata, O.crenata, O.granuhsa, O.australis, O.bi-
carinala, O. attenuata, Pse., O. M { Andrea, Fbs., sp. ined. (W^st
Indies). Other West-coast species are 0. crenatoides and var.
insculpta, 0. spongiosa, and O. retiporosa.

The species of this very natural group were arranged by Messrs.
Adams partly under Opalia and partly under Cirsotrema.

49. Opalia borealis, Gld.

0. testa 0. australi simillima, valde elongata ; anfr. xii., planatis, suturis
parum impressis ; testa jun. costis validissimis viii. latis, rotundatis,
peripheriam ftttingentibiiatenltim iuterfuptisj testa adulta stepius

244



from the Vancouver District. li

obsoletis, ad peripheriam evanidis ; circa basim totam usque ad
Deripheriam angulatam lamina spirali, planata ; apertura ovali ;
iota superficie rninutissime spiral iter striolata : operculo pauci-
bpirali, nucleo ad trientem longitudinis sito, lineis mcrememi va-
lidis. Long. !/, long. spir. 1-3, lat. '53, div. 20.

Hab. Puget Sound (U. S. Expl. Exp.)- y Neeah Bay and Ta~
tooche Island (Swan).

This species was doubtfully indicated, not described, by Dr.
Gould, in the ' E. E. Moll/ p. 207. It appears to be exactly iden-
tical with " crassicostata, Australia," in Brit. Mus., and is nearly
related to Ochotensis, Midd. It must not be confounded with
Acirsa borealis, Beck. One young specimen has the ten ribs of
0. australis.

50. Cerithiopsis munita

C. testa C. purpurece simili, sed angustiore, marginibus spirse fere
rectis ; costis spiralibus magis expressis, testa adulta minus nodu-
losis; basi sequaliter lirulata. Long. '34, long. spir. '24, lat. -11,
div. 20.
Hab. Neeah Bay; common (Swan).

51. Cerithiopsis columna.

C. testa majore, valde elongata, purpureo-fusca ; anfr. norm, ix.,
planatis, suturis distinctis ; seriebus iii. nodulorum spiralibus
valde appressorum, creberrimorum, interstitiis parvis, altis ; aliis
interdum intercalantibus ; lira quarta supra suturam baud valde
nodulosa, liris duabus baud expressis aream suturalem cir-
cumeuntibus ; basi planata, baud sculpta, ad peripheriam obtuse
angulata; apertura quadrata. Long. '38, long. spir. 32, lat. !,
div. 10.
Hab. Neeah Bay; several worn specimens (Swan) : Monterey;

rolled fragment of larger shell (Cooper).

Easily recognized, even in portions, by the " strung-fig "

pattern.

55. Cancellaria modesta.

C. testa elata, subrufa, trichotropiformi, marginibus spirse rectis ;
anfr. norm, v., rotundatis, postice subtabulatis, suturis irnpressis ;



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