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the Spondylus-vra,shmgs.

Tablet 447 is Liocardium apicinum, which should stand as species 709.

Page 314, note * (et seq.), for " Inflatulum" read " Mioceraa,"

Page 359, line 18, for "regular" read "irregular."

261



H.



DESCRIPTIONS



NEW SPECIES AND VARIETIES OF CHITONIM AND ACIMDJS,



FBOM



THE PANAMA COLLECTION OF THE LATE PROF. C. B. ADAMS.



BY
PHILIP P. CARPENTER, B.A., PH.D.



From the Proceedings of the Zoological Society of London, pp. 274-277,
March 14, 1865.



( 263 )



DESCRIPTIONS OF NEW WPECIES AND VARIETIES OF CHITONIDJB
AND ACM^EID^E, FROM THE PANAMA COLLECTION OF THE
LATE PROF. C. B. ADAMS. BY PHILIP P. CARPENTER, B.A.,

PH.D.

LEPIDOPLEURTJS ADAMSII.

L. t. " L. dispari" simili; pallide rufo-fusca, colore intensiore
irregulariter strigata sen macula ta ; scepius maculis albidis
regione diagonali ornata ; jugo vix acuto ; areis centralibus
et valvis terminalibus conspicue granulosis ; areis lateralibus
irregulariter verrucosis, verrucis plerumque lobatis ; mucrone
antico, vix conspicuo : intus, valvis centralibus uni-, termina-
libus viii. x.-fissis ; subgrundis parvis, dentibus acutis ; sutu-
j'is medianis postice rectis, antice laminas haud attingentibus,
sinu planato, latissimo : limbo pallii imbricatim squamoso.

Long. -6, lat. -3 poll. ; div. 1 10.

Variat verrucis minus expressis, simplicioribus.

Chiton dispar, C. B. Ad. no. 373, par.

Lophyrus adamsii, P. Z. S., 1863, p. 24.

Unfortunately for those who do not like to remove the non-tes-
taceous portion from their Chitons, as they do from their other shells,
the mantle-margin by no means affords a safe clue to the structure
of the valves. Among the species of the genus Ischnochiton, Gray,

265



275 DR. P. P. CARPEKTER ON NEW SPECIES

( = Lepidop?eurus, Add.,) known by the sharp incisor-teeth lying
within a projecting lip, there are three types of mantle-margin,
which may be conveniently separated as subgenera, to aid in the
difficult task of describing and identifying species. The typical
forms, for which the name Ischnochiton should be retained, have the
scales somewhat chaffy, and very finely striated. I. magdalensis
and /. sanguineus well represent the group. But another series have
the mantle-scales imbricate and strong, as in Chiton, Gray, ( = Lo-
phyrus, Add.,) from which they cannot be distinguished without
dissection. For this Messrs. Adams's name Lepidopleurus may be
retained in a restricted sense. It is uncertain what l\isso's original
genus was meant to include : his diagnosis applies to all Chitons
with distinct side-areas and scaly margins.

A third group, separated by Dr. Gray in his c Guide,' p. 182, as
having the " mantle-scales minute, granular," has been named Tra-
chydermon : it abounds in the Californian region.

The specimens of L. adamsii were found among the duplicates
named Chiton dispar by the Professor ; one was attached to Discina
cumingii.

LEPIDOPL.EURUS TENUISCULPTUS.

L. t. "L. adamsii" simili ; olivacea, color e pall ido sen intension
minute variegata ; tota superficie minute granulosa ; areut
lateralibus vix definitis ; suturis plerumque albido maculatis ;
mucrone antico, satis conspicuo, parte postica concava : intus,
ut in "L. adamsii " for mat a.

Variat : t. pallidore, ad jugum rufo-tincta.

= Chiton dispar, C. B. Ad. no. 373, pars.

The outside of this shell so much resembles the young of Chito,.
(Lophyrus) stokesii, that specimens may have been distributed undei
that name. Very few individuals were found.

ISCHNOCHITON ELENENSIS (diagn. auct.).

Extus areis centralibus clathris parallelis circ. xx. decussatis ,
ar. lat. costis ii., validioribus, tumidis, tuberculosis : intus
marginibus suturalibus posticis reflexis, tuberculatis, sinu ad
jugum parvo ; laminis insertionis unifissis, ad laminas sutu-
rales anlicos junctis, sinu latissimo. Valva antica extus costis
xii., haud validis ; intus Jissuris x., dentibus acutis, subgrundd
parva. Valva postica mucrone subpostico, depresso ; parte
postica expansa, concava, costis circ. xi. subobsoletis ; intvs
lamina insertionis circ. ix-.-fasa, dentibus curtis, subgrunda
parva, intus callosa.

The central valves in this species are normal ; but the posterior
valve offers a transition towards Callochiton, the outside being con-
cave posteriorly, the insertion-teeth short and the eaves callous.

ISCHNOCHITON (? var.) EXPRESSUS.

I. t. "I. elenensi" simili, sed carnea ; areis centr. clathris x.,

266



AND VARIETIES OF CHITONIDJC AND ACM.EIDJE. 276

distantibus, crebre decussatis, jugo acuto ; ar. lat. costis ii.,
validissimis, angustis, tuberculis angustis : intus marginibus
suturalibus posticis planatis, hand tuberculosis, haud sinuatis;
lam. insert, ut antea, sinu angusto, adjugum angulato. Valva
antica costis x., validis, angustis: intus ut antea, sed fissuris
viii. Valva postica mucrone postico, planato ; parte postica
expansa, haud concava, costis circ. vii. validissimis : intus
lamina circ. \\\.-Jissa, subgrunda planata.

With a strong general resemblance to I. elenensis, the differences
in detail in the only two specimens examined, as above stated, ap-
pear of specific importance. If only varietal, it is equally important
to notice how much change is tolerated by the habits of the animal.
It may be the shell called Chiton clathratus by Prof. Adams, of which
there were no duplicates to compare. It offers a still more marked
transition to Callochiton, the margin of the posterior valve being
somewhat pectinated by the great projection of the ribs.

" CALLOCHITON " PULCHELLUS : diagn. auct.

Extus areis centr, lincis interdum parallelis, interdum radian-
tibus, rugose scrobiculatis ; ar. lat. costis ii., validissimis, im-
bricato-nodons : valva antica costis similibus circ. ix. : v.
post, area centrali lata ; mucrone subpostico, planato; parte
postica costis vii. similibus, medianis curtissimis, excurvatis :
pallio squamulis minutis imbricatis. Intus v. ant. subgrunda
(ut in Ischnochitonej munita, sed a costis pectinata ; dentibus
acutis, intus linea undulata secundum costas instructa, extus
concavis, parte convexu costarum incisis : v. medianis similiter
pectinatis, laminis secundum costas diag. uniscissis : laminis
suturalibus media continuis, late sinuatis; suturis posticis a
sculplura externa granulatis : v. post, \ii.-lobata, marginibus
planatis, laminis dense compressis incrassatis ; dentibus obtu-
sissimis, appressis, haud extantibus, subobsoletis, extrorsum
planatiSy ut in v. ant. Jlssis ; interdum fissuris quoque in par-
tibus concavis.

As I have seen no published diagnosis of the very peculiar type of
insertion-plates observed in this species, which has hitherto been too
rare to allow working naturalists an opportunity of dissection, I have
given a minute description. The plates of insertion, as well as the
exterior eaves, are scalloped by the strong ribs, and alternate with
them. In the posterior valve the eaves are flattened outwards, in
closely appressed layers, the blunt, ill-developed insertion-teeth
lying flat upon them. The valves easily separate from the mantle,
when immersed in water. Outside, the species is easily recognized
by the two strong ribs of the diagonal areas, the central pitted in
somewhat branching rows, and the ribs on the curiously flattened
posterior valve resembling a clenched fist.



(? FLOCCATA, var.) FILOSA.

A. t. "A. rnesoleuc8e"/ orwza et indolesimili; sed sculptura multo

267



DR. P. P. CARPENTER ON CHITONID^ AND ACM^ElDJi.

tenuiore ; 1. jnn. lavi ; dein Hrulis deticatulis, acittis t haml
granulosis, valde distantibus, inrerdum obsolctis, Jilosa ; intcr-
stitiis l-atis, Itevibus ; tenui, planata,ovali,subdiaph(ina; nigro-
fusco, corneo radiatim striyata, sen varie macula t a : tntus
licida seu albida, coloribus externis tr anseuntibus ; limbo lato,
acuto.

Long. -7, lat. -56, alt. -12.

Lottia ? patina, C. B. Ad. Pan. Shells, no. 367.
Hab. Panama (C. B. Adams).

There is no described west-tropical species to which these shells
can be affiliated, unless they prove to be a very delicate variety of
A. Jloccata, Rve. Unfortunately the Panama limpets have never
been collected in sufficient numbers to make out their specific limits
satisfactorily. The names here given may stand as species or va-
rieties, according to future elucidation. In shape and texture, but
not in colour or sculpture, these shells resemble A. fascicidaris ; in
the latter respects, A. strigatella. They were named " tenera, Ad."
by Dr. Dohrn, but are sufficiently distinct from that West-Indian
species.

ACM.EA (? FLOCCATA, var.) SUBROTUNDATA.

A. t. "A. var. filosee" simili, sed subrotundata, magis elevata,
vertice subcentrali ; colore intensiore, lineis cornels crebrioribus,
angustis ; t. jun. scepe pallidiore, radiis duobus postice trian-
gulata : intus callo livido, tenuiore.

Long. -53, lat. -45, alt. -15.

= Lottia, sp. ind. a, C. B, Ad. Pan. Shclls.no. 368.

Hab. Panama ((?. B. Adamaj.



(? var.) VERNICOSA.

A. t. parva, subrotundata, depresso-conica, apice ad duas quintets
paries sito ; albido-viridi, strigis paucis rufo-fuscis hie et illic
ornata, scepius radiis duobus candidis t postice trianguluta ;
extus lineis acutis radiantibus, valde distantibus, scepe obsoletis
mx sculpta : intus livida, callosa, scepius spathula Candida or-
nata ; basi subplanata, limbo angusto.
Long. -3, lat. -24, alt. '1.
Hab. Panama (Jewett, C. B. Adams).
= Lottia, sp. ind. b, C. B. Ad. Pan. Shells, no. 369.
Had this form been brought from the China Seas, it might have
been taken for the young of A. biradiata, Rve. From its solidity,
however, its rough" exterior, and its callous interior, it appears to
be adult. It is barely possible that it may develope into A. vesper-
tina. It differs from the young of A. subrotundata in being much
thicker and less spotted with the green tint.

268



I.



DIAGNOSES



NEW SPECIES OF MOLLUSKS,



THE WEST TROPICAL REGION OF NORTH AMERICA,

PRINCIPALLY COLLECTED BY THE RET. J. ROWELL, OP SAN PRANCISCO

BY

PHILIP P. CARPENTER, B. A., PH. D.



From the Proceedings of the Zoological Society of London, pp. 278-282,
March 14, 1865.



( 269 )



DIAGNOSES OF NEW SPECIES OF MOLLTJSKS, FROM THE WESI
TROPICAL REGION OF NORTH AMERICA, PRINCIPALLY COL

LECTED BY THE REV. J. RoWELL, OF SAN FRANCISCO. B*

PHILIP P. CARPENTER, B.A., PH.D.

Of the new species quoted in the " Supplementary Report on the
Present State of our Knowledge of the Mollusca of the West Coas*
of North America," published in the Transactions of the British As
sociation, 1863, pp. 517-686, the principal portion (namely, those
dredged by Dr. J. G. Cooper, Zoologist to the California!! State
Geological Survey) are described in the ' Proceedings of the California
Acad. Nat. Sciences,' for 1864-65; those dredged in Puget Sound,
during the U. S. North Pacific Boundary Survey, by the late Dr.
Kennerley, are described in the 'Journal of the Philadelphia Acad.
Nat. Sc.' for the present year. The species obtained by the natu-
ralists of the British Survey are described in three papers by Dr.
Baird and myself, P. Z. S. 1863-65. The new species sent by
Mr. J. Xantus from Cape St. Lucas, and by Mr. J. G. Swan from
Neeah Bay, appear in the 'Ann. and Mag. Nat. Hist.,' 1864-65. In
the same Journal are described the new species which I found in
Col. Jewett's collection. Those sent to Dr. Gould from the same col-
lection had been previously analyzed in the ' Proc. Zool. Soc.' 1856.
The above are the principal sources of fresh knowledge; but a number
of species from the Californian province, which do not range under
any of these heads, will be found in the 'Journal de Conchy liologie'
for the current year.

In separate papers communicated to the Zoological Society are the
diagnoses of additional species from Prof. Adams's Panama and from
M. Reigen's Mazatlan collections. The remaining species, from the
tropical province, are embodied in the present paper. The types
(unless otherwise stated) are in the Museum of the Smithsonian
Institution.

(TELLINA) ANGULUS DECUMBENS.

A. t. tenui, subplanata, alba sen rosacea ; lavi, striolis incre-
menti insculpta ; epidermide pallide straminea induta ; antice
et ventraliter valde producta ; postice truncata, angulata ;
umbonibus acutioribus, vix prominentibns ; maryinibus dorsa-
libus postico recto, antico ad angulum parum excurvaio, antico
et ventrali valde et regulqriter excurvatis ; parte postica v.
dexfr. subito angulata, v. sinistr. parum sinuata ; nymphis an-
gustis, elongaliSy cartilagine omnino externo : dent. card, mi
nimis ; dent. lat. v. dextr. antico satis conspicuo, postico obso-
leto; v. sinistr. nullis ; cicatr. adduct. posticis subrhomboideis t
anticis valde elongatis, angustis ; sinu pallii maximo, subtri-
anffulari, usque ad cicatricem alterant, utraque valva porrecta.

Long. 1-7, lat. 1-2, alt. '68 poll.

Bab. Panama (teste Rowell, Pease).

This shell was affiliated by Mr. Hanley to the W. African T.
"271



279 DR. P. P. CARPENTER ON NEW SPECIES

nymphalis, but differs in the internal scars. Externally it resem-
T. dombeyi, Lam. (= Scrobicularia producta, Cpr. P. Z. S. 1855,
p. 230), but is easily recognized by the strictly Tellinoid ligament
and anterior lateral tooth, by the posterior portion being pinched
instead of waved, and by the junction of the pallial sinus with the
opposite scar. By the same characters it is distinguished from T
tersa, Gld., which closely resembles S. dombeyi, var., in Mus. Cum.
Like many other Tellens, it has a white and a pink variety. The
uame was printed by an oversight in Brit. Assoc. Rep. 1863, p. 669,
as A. amplectans ; but as it was unaccompanied by a diagnosis, and
does not describe the shell, no confusion will arise from reverting
to the name first given.

LUCINA UNDATA.

L. t. convexa, tenuiore, albida; tota superficie lirulis concentricis
creberrimis, compressis, hand acutis ornata, inter stitiis mini-
mis ; parte ventrali costis radiantibus iii., obtusis, latis, vnJi-
dissimis, interstitiis parvis ; iunula maxima, a sulco bene defi-
nita, sub umbonibus incurvatis fossa alta minuta indentata;
parte postica alata ; margine a costis valde undato, minute
crenulato ; ligamento quasi interno : intus dent. card, parvis,
a fossa lunulari intortis ; lat. curtis, obtusis ; cicatr. afl<h>ct.
antica irregulari, postica subovali ; linea palliari prope mar-
ginem sita, undata.
Long. -45, lat. '44, alt. -3.
Hab. ihilf of California (teste Eowelt).

The outline somewhat resembles Cryptodon ; but the aspect
is more that of Verticordia, while the minute subumbonal pit
is suggestive of Opis. The shell is sexpartite ; the portion between
the anterior rib and the lunule resembles a fourth rib, while the
projecting lunule and the posterior wing are quite distinct from the
body of the shell. The specimen sent by Mr. Rowell to the Smith-
sonian Institution was completely smashed. The diagnosis is written
from a perfect shell sent by Dr. Newcomb to Mr. Cuming.

CALLIOSTOMA (?LIMA, var.) ^QUISCULPTA.

C. t. "C. limse" simili ; sed anfr. planatis, suturis houd dis-
tinctis ; sculptura regulari ; jun. monilibus spiralibus inter se
cequalibus ; t. adulta majore et minore alternantibus ; co'ore
rufescente, granulis interdum rufo-fusco maculatis.
Hab. Acapulco (Neivberry).

Dr. Newberry's specimens agree in most essential respects with
" Trochus lima, Phil.," in C. B. Ad. Pan. Shells, no. 2/6, which
appears identical with the shells marked " Ziziphinus antonii, Koch,
N. Zealand," in Mus. Cuming. The Acapulcan shells are quite
flat, while those from Panama are for the most part shouldered as
in C. eximium, Rve. (= C. versicolor, Mke. Maz. Cat. no. 28y).
However, there is no little variation among the Professor's speci-
mens of C. lima, and some are so slightly shouldered thai the Aca-
pulcan form may be a local variety.

272



OF MOLLUSKS FROM WESTERN NORTH AMERICA. 280

NARICA INSCULPTA.

N. t. " N. apertse" simili, sed magis compacta ; paullum angus-
' tiore, umbilico tamen major <? ; lineis spiralibus circ. xxvi. dis-
tantibus insculptis cincta, quorum x.in anfr. penult, monstran-
tur ; postice lineis incrementi vix conspicuis.
Long. -3, long. spir. '08, lat. '28; div. 100.
Bab. Acapulco, on Ostrea iridescens, Rowell.
The Cape St. Lucas species (vide Ann. Nat, Hist. 1864, xiii. p. 476)
has the sculpture in irregularly raised limlae, while this has minute
grooves chiselled out of a smooth surface. It appears that the San
Franciscans import the huge tropical oysters in large quantities,
their own species having the coppery flavour which Americans dis-
like in the British species. From the outside of the valves, Mr.
Rowell obtained this and many other interesting species.

DlilLLIA EBURNEA.

P. t. turrita, carneo-albida, tenuiore, Itevi, maxime nitente; mar-
ginibus spirce rectis ; anfr. nucl.1 . . . [decollatis] ; norm,
circ. ix., postice planatis, supra suturas appressis, medio satis
excurvatis ; hie et illic ruffi.s radiantibus, obsoletis., irregula-
rihus ex sculpt a ; basi prolongata, canali conspicuo, aper'ij
sinu postico minore, in eulco Jato, hand definito, spiram rw?n-
denle sito ; labro acuto ; labio indistincto ; columella pl&nata.

Long. 1*3, long. spir. -8, lat. '45; div. 30.

Hab. Near Gulf of California (teste Rowell).

Easily recognized by its smooth glossy aspect and French-white
colour ; the notch lying along a broad spiral channel, which throws
the junction of the whorl as it were up the suture.

MANGELIA ALBOLAQUEATA.

M. t. solida, turrita, alba, rudi, marainibus spirce rectis ; anfr.
nucl.? . . . [decollatis] ; norm. circ. ix. subrotundatis, costis
circ. xi.-xv., declivibus, satis angustis, postice obsoletis, lineis
subreaularibus spiram ascendentibus ; lirulis spiralibus anticis
crebris, postice obsoletis ; basi elongata ; labrol . . . ; labio
talloso ; sinu postico majore, suturam attinaente.
Long. "88, long. spir. '55, lat. '34; div. 30.
Hab. Panama (teste Rowell).

Described from an imperfect and worn specimen, but easily recog-
nized by its ivory-white colour, and ribs in slanting rows, as though
the creature were roofed with white tiles. It was erroneously quoted
in the Brit. Assoc. Rep. 1863, p. 669, as a Drillia.

ElJLIMA FALCATA.

E. t. valde tereti, valde curvata t alba, politissima, solidiore,
marainibus spirce meniscoideis ; anfr. nucl.1 . . . [detritis'] ;
norm. circ. x., planatis, lente augentibus ; axi hamata, suturis
indistinctis ; basi elongata, hand tereti ; apertura pyriform\ t
anlice latwre; labro acuto, labio tenui, appresso.
18 273



281 DR. P. P. CARPENTER ON NEW SPECIES

Long. -31, long. spir. '21, lat. '09; div. 12.
Hab. Acapulco, on Ostrea iridescens, Rowell.
The spire-outlines are scythe-shaped. It is much larger and more
solid than L. distorta and (?var.) yod.

CERITHIOPSIS INTERCALARIS.

C. t. valde elongata, rufo-fusca, marginibus spirce rectis, suturi*
impressis ; anfr. nucl. iii. -f ? . . . (decollatis), radiatim di^
tanter liratis ; norm, x., planatis ; costis radiantibus primwr
xii., dein circ. xxii., angustis, huud extantibus, ad peripherian'
continuis, interstitiis quadratis ; carinis spiralibus primum ii.
nodulosis, dein alteris ii. minoribus inter eas intercalantibus ;
carina postica suturali hand nodulosa, secunda valde nodulosa,
tertia intercalante cequante sed hand nodosa, quarta antica
valde nodosa, quinta circa peripheriam, prirnce et tertite simili,
hand nodosa, alteraque contioua, minima, inter quas sutura
gyrat ; basi concava, lavi ; columella valde cuntorta ; canah
brevi, aperto ; labrol ... *
Hab. Guacomayo.

This beautiful species comes nearest to C. bimarginata, C. B. Ad.,
of which, indeed, the type does not agree with the diagnosis so well
as does this specimen. It differs in having other spiral ribs inter-
calating between the two principal ones, and in the radiating sculp-
ture being continued to the periphery. One specimen only was
found in the shell- washings, not perfect at the mouth.

COLUMBELLA HTJMEROSA.

C. t, parva, turrita, alba, linea sen maculorum serie fusca inter-
dum spiram ascendents ; marginibus spirts parum excurvatis ;
anfr. nucl.1 . .* . \detritis] ; norm, vi., convexis, postice tumen-
tibus, suturis valde impressis ; costis radiantibus vii.-viii., dis-
tantibus, validissimis, rotundatis ; interstitiis late undatis ;
lirulis validis smralibus extant'ibus* interstitiis eas aquatitibus,
coslai et narum tnterstitia transeuntibus ; basi angusta; labro
riv raricoso, postice emarainato, intus solidiore, dentibus circ.
iv. munitis ; apertura late undata, compacta.

Long. -26, long. spir. '15, lat. '13 ; div. 38.

Hab. Acapulco, on Ostrea iridescens, Rowell.

The sculpture resembles that of Rhizocfieilus, and the tall spire that
of Anachis ; yet it appears to belong to the restricted typical genus.

MURICIDEA DUBIA, Var. SQUAMULATA.

Variat i. omnino albida ; sculptura tenuiore ; spira elevata ; tola

superficie minute squamulata, squamulis imbricatis.
Eab. Cape St. Lucas (Xantus).
The opercula in the beautiful specimens sent by Mr. Pease are

* I forgot to measure the specimen before returning it to the Smithsonian
Inst. ; but it is about the size of C. assimilata.

274



OF MOLLUSKS FROM WESTERN NORTH AMERICA. 282

typically Muricoid. The essential features are those of M. dubia ;
the pale colour and delicate sculpture and imbrication may a v ise
from a deep-water station, as is seen in similar European shells.
Mr. Cuming, however, regards it as distinct.

275



K.



DIAGNOSES



OF



NEW FORMS OF MOLLUSCA,



THE WEST COAST OF NORTH AMERICA,

FIRST COLLECTED BY COL. E. JEWETT.

\
BY

PHILIP P. CARPENTER, B.A., Pn.D.



From the Annals and Magazine of Natural History. Third Series, Vol.
XV., pp. 177-182 (Nos. 373-386), March, 1865. Ibid., pp. 394-399
(Mangelia variegata to end), May, 1865.



( 277 )



DIAGNOSES

Ml

NEW FORMS OF MOLLUSCA

FROM

THE WEST COAST OF NORTH AMERICA,
FIRST COLLECTED BY COL. E. JEWETT.

BY

PHILIP P. CARPENTER, B.A., PH.D.



AN T account of Col. Jewett's shells will be found in the British
Association Reports for 1856 (pp. 226-231) and 1863 (pp. 534-
539). The exact localities are often uncertain; but many of
them have been fixed by subsequent explorers. Being generally
worn beach-specimens, the diagnoses have been written (where-
ever practicable) from perfect shells, and especially from the
beautiful series dredged by Dr. J. G. Cooper, in the Californian
State Survey. The types belong to Mrs. Boyce, of Utica,N. Y.,
and are at present in my keeping. The numbers, in the species
from the temperate fauna, refer to the table in the British Asso-
ciation Report for 1863, pp. 636-664.

37 b. Solen (? sicarius, var.) rosaceus.

S. testa S. sicario simili, sed minore ; multo angustiore, elongate,
recta, extus et intus rosacea; epidermide tenui, valde nitente.
Long. -27, lat. />, alt. -32 poll.

Hub. Sta. Barbara (Jewett) ; S. Pedro (Cooper).

74. Subgenus AMIANTIS*.
Callista : dente postico utraque valva ruguloso.
Type ; Amiantis callosa, = Cytherea callosa, Conr., = Dosinia

* Th. djjiiavTos, 6 KOI fj, unpolluted.

279



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

callosa, Brit. Assoc. Rep. 1857 (from fragments) : non Venus cal-
losa (as of Conr.), Sow., live., Desh.

Hub. Sta. Barbara (Nuttall, Jewett} ; S. Pedro (Cooper] ; Cape
St. Lucas (Xantus}.

This section differs from the typical Caffota as does Merce-
naria from Venus. Whether the other peculiarities of the spe-
cies (redescribed by Reeve as Cijtherea nubilis) are coordinate,
cannot yet be stated, as it stands alone. In sculpture and colour
it resembles Dosinia ; in its ponderous growth, Pachydesina.

110. Lazaria subquadrata.

L. testa extus Carditce variegatce jun. simili ; pallida, castaneo tincta;
subquadrata, antice truncata, subregulariter ventricosa, dorsaliter
tumida ; costis radiantibus circ. xiv.-xvi., tumidis, nodosis, dia*
gonalibus majoribus ; interstitiis plus minusve insculptis : iutus,
valva dextra dente cardinali triangulari, inter duas fossas sito, haud
elongate ; dent. lat. a cardine separatis, ant. extante, post, obsolete,
calloso : v. sinistrali dent. card. ii. angustis, subsequalibus, radi-
antibus; lat. ant. et post, extantibus : cicatr. adduct. subrotim-
datis. Long. '37, lat. -25, alt. '34.

Hab. Sta. Barbara (Jewett) ; Monterey, and along the coast to
S. Pedro (State Coll. no. 403) (Cooper}.

The outside of this remarkable little species is typically Car-
ditoid ; the hinge is intermediate between Lazaria and Cypri-
cardia.

132. Modiola fornicata.



Online LibraryPhilip P. (Philip Pearsall) CarpenterThe mollusks of western North America → online text (page 33 of 45)