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I

EEV[si()X OF tup: i)i:i:p-\vatf;u mollisca of iii

ATLANTir COAS'r OF NOKTIl AMI^IMOA. Wmi Dl
SCKIPTIONS OF NFW (iENFliA AND SPFCIlvS.

PAirr I.— IHVAIA'IA.

IJy xVddtson K. Veiuull,

rro/i Hsor III' /oiiloiiii ill Villi: I'lurei-fiUij

IvA'iiiAiuNE J. Brsn,

Jfisiyliiiil ill I'lahiidji Museum of Yale riiircrsit!/.

1

• Sr*

Tins article is not intended as a review of all tlio known species
found off our coasts. It is ])reliiniiniry to a much more extensive
rei)ort, in which full details of the distrihution of all the species col-
lected will be j>iven, and for which the detailed tables have been pre-
pared, givinji' every station for each species, with its i)osition. depth,
temperature, character of the bottom, etc.

Many of the larger and more i)n)minent species were described and
figured by the senior author several years ago in various i)apers pub-
lished in the Transactions of the Connecticut Academy and elsewhere.
The snmller and more dillicult species weie put aside at that time, for
more careful study, and are now presented.

The families that are most fully treated in this article are the Ledidie,
Cuspidarida', Diplodontid.e, anil I'ectinida-. Tiiese include a very-
large number of deep-sea species in every region, and their species are
often very dillicult to distinguish witiiout long and patient microscopic
study anil <lirect comparison of large series of specimens from various
localities.

The present article is intended to give some of the results of studies
of this kind, made during several years, of the large series of si i-
mens dredged by the Tnited States I'ish Commission oil" our coasts
from 1871 to 18S7, together with those previously dredged by the senior
author in the same region.

Proceedings U. S. National IVIuseuMj Vol. XX— No. 1139.

^[mf,\iv>^'. i!*>i.i ii+«j,fRitfjH[

77(i

i'i;(tci:i:i)i.\(is nr riii: smioxal mi si:i \i.

Vi'l.. x\.

In ordci' to itvoid. so t;ir as possihlc. tlic iiiMMMtaiiily iicccssaiily
i'oiincctcd wirli humc ('csciiittioiis ot' tlirsc foiins. we liaxc had laruc
caiiici'a Iiicida lij;iiit's made as ('art'l'iilly as possililc. not onl.N ot flu'
now s]>i'('i('s. bnt also ol sonic nl' thosr i»ic\ ionsly dt'sciilnMl tioni our
coast, for conipai'isitn. Il is. t iit'it'to! c. to l)t' hoped tlial t'litiirc invcsti
yalors nniy at least l)e al)h' to nndcistand t lie charartcrs ol' t lit' s|ircirs
now I't'founi/t'd 1)_\' us. wlHthcr they au'it'c with ouf dctcrininations or
not.

Althonji'li the collections studitMJ arc uiiiisiiall\ c\tcnsi\c, and the
iiniidx'i' ot stations rcpi'cscntcd is very lai',i:c. it is not<'W(irthy ilia! a
coiisidcrabli' imnilicr of species were met with Imt once, and soinetimes
only a siii<;ic specimen w as dhtained. This indicates that many addi-
tional species ot" such small d-ep sea shells would be discovered in the
same reuiou if additional di-edj:iii;L;s should be made.

()ur in\esti,nations have enabled lis to add to the fauna nine .genera,
four subucneia. and aliont eiuht\' sjiecics and \ai ieties. ol' which about
se\'ciit,\ aie described as new species and se\tMi as new" \arietics: of
these, twtd\e species and one \aiiety behHi<i' to the soiitliein fauna.

The followiiij^' list shows the .^cneia in which the new species and
varieties aic included.' The new <;tMiera are printed in italic:

Mttrh sii 11(1, 1.
Al>r;i. \ nr. 1 .
M;i((ini;i. 1
Moiitiniit.i. I. v;ir. '2.

h I llnijixis.

( rv]iiinl(iii. I, \.ir. 1.
.I.i'iiiiilii'<, i>.
Axiiioiisis. 1. v;n . 1.
.1.1 i iiiiiiini , 1.
L( lild.i iinix, 1.
l"iis]iiiiaiia, S.
( Mriliomya. 1.'.
llnl(inyiM]iliii, 1.
.M\i)uor;i, li.

roniinx M. var. 1.
( 'i'tii''<i iclia. L'.
( 'I'lDins a, 1 .
I.ydiisirlla. -.

l.> 01i>i,", 1.

(ii(li(iji!i<iia, 1.
KciiniTiia. 1.
i'lTiiddiiia. 1.
I.imatii'a, I!.
('hi.i!ii,\ s. 1'.
1 1\ a l(i]u'ctrn. 1.
('inii|ii(>iM'cr('s. 1.
C,\ •-■loptTtt'li. '2.

Ilalhyaiia. '2.
Ill nihil red.
I.iiniiji>i>. 2.
Solciiiva, 1,
Xili'iiia. 1, \ ar. 1 .
I.t.la. 1.

I.cil.'lia. 1, var. 1.
Adruui lilt. 1 .
Mici'iiyoMia.
VdMiflla, 11. \ar.
Mallctia. 2.
Xi'ildiiflla, 1.
'riiularia. W.

No attempt lias been made to jiive the coiMi)lete synonymy and
details of the distribution. iSuch matters have been leserved Ibr the
final report on the collections.

I'liless t»therwise stated, the station numbers are those of the
I'nited States I'Msh ('ommissioi. and tli(> serial numiicrs are those of
the I'liited States Xational Museum.

The drawiui^s. with few exeepti >ns. were made by ;\Ir. Alpheus II.
^'errill. under the iiuuiediate supervision of the authors.

I'luhoilii Miinciim (if Yiilf I'liii cmilij, .Siw lliinti, Coini' cliciil. •Iiniuiiry 2.'>, 180^.

'Owiiig to tlio loiiy (l('la\ ill tlic iHiIil'calioii of this article, sonic of the iicw
sjjccics and ueiicra liavc been imlilished elsewhere, so that these immhers are not
now strict Iv correcl.

S

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NO. u:i!i.

ItlJA'-WMEU .]J(iLI.l sc l—l lilU.ll.L AM' III ^n.

I I I

F;iu)il.v rilOLADlh.i:.
MARTESIELLA, now s-ubgenus.

Tliis sul);jft'iuM'ii' iiaiiu' is iHoitoscd lor tlif t'oUowiiiij,' siiccics. wliicli
(litTcis from Marttsid in liavini;' ;i well dctiiicd. clon^attMl. incilinii. dorsal
|diit«'. posti'i'ior to the uiid)os. in nddilioii to tlic sliii'M-sliapi'd one oxci'
tlii'iii.

MARTESIA .MARTESIELLA) FRAGILIS. new species.

. riat." l.WIX. liu. 1(».

Shell small, white, thin, tVa,uile. wedj^e shaiicd. 'I'lic antei iof end is
very short and broadly rounded, the apertnre iifarly closed in onr
lar.iiest specimen l»y a pair of e;dloiis plates. The anteio dorsid nmriiin is
reenrved toward the und)os. l)nt imt appresscd. ;iimI forms ;i deep, spii ;il.
ojien ca\ity. The v;d\es h;i\e :i very ol)tnse iinterioi' cnniruimit inn.
A tuoad and moderately deep sulcus runs from the beak to the Ncntral
nmr-in; in front of this the surfac*' is covered by thin concentric ribs,
which cni've downwaMl at the sulcus and form a distinct an.ule in line
with the anterior emnrfiination ami c()rres])t)ndiu,u' with a sliuht ridm'
on the surface: these coin-en trie ril»s are crossed by tine radiat in>i- lines,
which jn'oduee fine >ci rations on their ed.u'es. l*osteri(U' to the sulcus
the surface is maiked oiil\ by ii-reji'ular lines of jirowth. whi(di. near it,
take the form of m>i c distinct yroo\-cs or rid.u'cs. The posterior end is
proloniLied. compres-cd. ai:d l)liintlv rounded. The umbonal plate is
thick. relati\-el - lai ,ue. and iisiiall.\ heai t shaped. \\ ith I he posicrioi' end
broader and di>tiiicil\' caiar^inate in the middle: the ;iiiIciior eml
tai)ers somewhat and is Itlnnt ;iiid an,i:iilatcd. or siuuetimes subacute.
The p'isterier dorsal i)late is lon.u'. inirrow. and smm'wiiat spatiilateor
clavate. and stands well in relief above the doi>;il nnr uin. with tlic
ed,m's free and the narrow anteritu' (uul runnin- under the posterioi'
end of the \iinboiml plate.

Leiiiith of o!ie of the larizost specimens. 7 mm.: hei-ht. \.'> mm..-
thickness. 4 mm.

Young speeiinens ."> or 1 mm. in len.yth are relatively shorter ami
thieki'r than the larji'er ones, but even tlu'.se have the anterior callous
pretty well develoi)ed; the umbonal plate is usually shield shapeil,
the lateral borders einarjiiimte, in contact with the most prtunincni
part of the umbos: the posterior border is distinctly emarjjjinate. ami
the anterior end has a central point or mucro. sometimes delined liy
slightly concave posterior ed.ucs.

Many live s])ecimens were tbuiid in a pieci^ of wood tloaliiii; near
station 2o()<l, N. hit. ;i7 S.V, W. lony. tis> S', 18,S.").

■J

y

7TS

/•/;"' 7;/;/)/.\v,.s' of nii: .v.r/vo.v.i/. .][rsi:r.)f.
Faiiiilv SKMl'LlD.i:.

vol.. XX.

ABRA LONGICALLIS i Scacchi), variety AMERICAN A. new.
. I'lali' l.XXXIIl, li^^'^. li. T.I
.Ihn, h>ii<yi,iiUis Vi ititii.i., I'i:ms. Coim. A.aa., \ 1. pp. L"-'l. -'TS. I'^.^l.
Our spcciiiH'iis (lifter I'miii llir Iliirup.Mii form dc^ciibcd and li,uunMl
1)V C. O. Sais' ill liaviiij-- llu' pc.stniur lateral toolii le.ss I'eiiiote and the
eartila.u-e i'i< <»'' <'li(>iidi'«M>l'">'*' l<>ii,^«''N tli<' aiiten.-dorsal iiiar-iii more
convex, and ihe wliole shell relati\el\ hroader.

A very few .specimens were ol»taiiied at six stations Ix'tween N. lat.
'.Vr !!»', W. lonji-. <1S" L'S' 'M'\ and N. lat. ;3«» l(i' .W)", W. lony. »;s 21 . in
i>24 to LV>-'<> fathoms, iss.j-issti.

Family TIOLLINID.K.

MACOMA INFLATA Dawson.
H'liit.'s l.XW II. liu. I: I.XXXVllI. li,--. tl.)
MucuHH iiijh'l': .STixH'x.N MSS D.vw^os. (•..n;i.li;.n Xiit iinilisf , \1. ]>. :■".

ISTl.'.— \ 1 Kltll,!,, ■!'i;ili'~. ('(Mill. \r;i(l.. \ , Ji. .">I'.S. ISSJ.

A iiuiiiluT of live speeimeiis and separate valves were ol)tained at
.six stations between N. lat. 17 1(1'. W. loiif-. 17 ;i.V ;5()". and N. lat. Id
;'.'. \V. lon<;-. 70 •'•l'. in ^u to iMM; fatlioins. lS77-lS,st). Miirn.v Uay.—
Dawson. (Inlf of St. Lawrence.— Coll. Whiteavos.

Family FKTKlCO.l-lD.F.

CHORISTODON ? CANCELLATUS Verrill.

, riiitf xc\i. li-s. •_'. :;. )

Choriftodon ; ninrdldliiH Vkijim i.i.. Trans. Comi. .Xcul.. NI. p. ir.. 1S.S.-..-1 Iai.I,.
r.ull. I'. S. Nat. Mils.. No. ST. p. •"'>*. 1>'''^!'-

One valvu. Station L'-'fi""), off Ghesapeike i'.ay, in 70 fathoms, 188-i.

Family KFLLlFLLID.i:.

KELLIELLA NITIDA Verrill.
(i'lat.'S XCt. li-. S: XCIII, tiji- 10. >
Krilirlh, sp. Vkiiimm.. I'rau.s. (.!omm. .\ra.l.. VI. p. I'Tlt, ISKl; 1-xpl. Alh.ilro..,

K'cpi.rt I . S. Coin, fish niul I'islicrios lor ISSH, p. ."iTt), ISS,").
Krilitlla infnht \ KI.'KIM , I'laiKS. Cniili. .\i;h1.. VI. it. l:{S. lK8r>.

Comparativelv few specimens, at seven .stations between X. lat. ;!•.»''
5' ;!(>", W. lon.u. 70 II :W, and N. lat. ;5.S^' 20\ W. lono-. 70" S ;?(!'. m
l..")25 to l.',0;5H fathoms. ISS.UISSC. ^

"■ MoUuHca Keg. An'ti.a' Xorvo-ia^. p. 71. pi. <i. lij;s. :! „-,:: ]>\. -0. lig. 1. l^TS.

NO. Ii:i!t.

/»/.7.7'-M-.(/7,7; Mull rsc.\—\i:i;i;il.]. i \7> Hisll.

77n

«Zv>

Fiiinily IJ'.I'TON 1 1 ). I', or IllfN ( 'I N 1 1 ). K.
KELLIA SUBORBICULARIS Montagui.

ri:itc \(i\'. li^s. :;, 1. 1

hillid sidiorliifiilaris II. ami A. AhvM--. (icin'in l,'c<ciil Mull.. II, |>. IT.'; III. |il.

( \1\ . Iii;s. S (/-(•. l.S.",S. .1 I I I l!l ^ S. r.ril i^li ( 'lUiclioJdjrv , 1 1, p. j-.-,, |,|, ^ , in;.
:!, IX(i:>; \ , \>. 17!>. 1>1. W \ll, lii;. L'. I Mill. <.<>1 I I., i;c|,. <i|| IhmmI. uf M^ss.,
liiniKv's eel.. ]>.S:;, liy;. :i'.ll, ISTO. — TuMpN-, \iiicI. M;iI. < nil. Ii.. ]i. 171, |il.:!.'.
lijJM. |:!:l. i:i.^. I.S";!. — (i. ''. S.MIS, Mdlln-c;! l.'i'U. \|-ctlr;i' \iir\rui;i . ]i. (IT. pi.

!!•, lius. II (/ //, jSTS. — .Irri l;I;^ --. I'roc. /u.'il. >ni ., I.uikIuh, |i. ~iui, .lnnr.

IS^!!. — SMI I II. I'.. A.. 1,'ipnl I \ iiV. ( ll.illcimil . /in'il. l..llll(llilir:ilirlii,i|.i, \|ll,

)). L'nl, |Ss.",. |iAi I , r.iill. r. S. N.it. .Mils.. Nil. ;!7. |i. I'lm. pi. i \ \ m. Iil;. "■, l-«s '.

One ri<'.^li s|»('riiii('ii. .M;iss;icliil.>^('t Is l!ii,\. t)ll Siilciii. I>77. Tliis
sprcii'.s ;i|»|)eai'.s lu lie scry raic on Hit' .\iiicri«';iii coii-t. In its liinutv
characters it scciiis tn a.urco «'l()si'l\ with llnniiit l*liili|tiii, l.s.'id.

MONTACUTA BIDENTATA (MontaKU,.

I I'ImIc- XCIII. lius. 7. s; .\C1\', liu. 1). 1

Mjl<i hidi iiliitti M()\ I Aci . I't'^-i. Hrit .. |). I 1. [il. \ \ \ 1. I'il;, .">, |S(i:!.

Moiilfiiiiln hidi iildhi ruiiiii - .iihI IIami:\. IIi>i. Iliii. Moll.. II. ]i. 7."i. ]>] win.

liys. (p. (!((.
ri'lliiiiiin hiilf iiliild I I . .iiul A. A I' A M^. I ■cllclM li'irc'iil Mull.. I I. |i. I7S ; lll.jil.i\\,
li^s. :'. -Jit. 1S.")S.

Miiiiliiiuid liidciiliihi Jkii la;^ s. Ilriii-h ( nm ii(.|iM_\ . II. p. I'lis. pi. \. I'm. i. i^ii:;;
\', 1>. 177. pi \ \ M. lii;. S. Isdp. -(;. I ». >\i;.. .'.InllnMM I.'^i,'. Aid ii ,i- \iii\ c:.;!;!'.
]). l>li. 111. \'.K W'A^. 17((-/i. Is7s.— .Iia I'Ui.s >. I'roc /.cn.l. Sue-.. Lomldii. p. li'.iS,
.liiiH-. l.ssi.- \ laaai.i . 'rr;iii.'<. Conn. Amd.. \. p. ."i71. issi.', — Hr-ii. IrMiis.
('(inii. Aciiil.. \ 1. p. 17a. Iss.'i: I'.xpj. .IIIkiIiuss, i;f|iiiit I'. S. ('(iiii. ri-,li .mkI
I'i.slu'rics tiir ISS:!. |i. ,"i!l(l. IsS.'i \iil Mantiti nlu hiihnldla 'ioiilil.

<\)niiiaiati\ «'ly lew spt'ciiiKMis jnivc lictai IoiiihI in Loii.u isJaiMl SoimkI
and at 'I'hiiiildc IshuidiA. M. \ crrill : I'rox iiH-ctowa. Massarinix't t^
(S. I. Smith and O. Iliri.<'r): N'incyard Sdiiiid. 1S7.">; (."a|ir ( ud I'.ay,
ISTJt; (iff IdiicU Ishilid. ISSO: Woods lloU'. .Massachusetts (iiit of
Oaiiso, and Naiislion (lutteisi. ISSi'-S.!. I^'roni h)\v-\vater lo l.->.',
fathoms. OIV ("ape Ilatteras. North Carolina, in I I to |s fatliom-«. i >;s;{
mid Issi.

m

MONTACUTA BIDENTATA (Montagu., variety TENUIS, new.

( Plate \CII. i\)i. 7. '

Sliell simihir to tlie typical .1/. Iiith iilald in t'orm and si/.e. hut rela
tividy more elonj^ated and iiioie nearly elliptical, witii the nmiio-^ and
beaks somewhat less pronuneiit. The surface is covered with line and
pretty regular lines of j;ro\vth. The teeth in the ri.yht x'alve are strono-.
nearly (MHial in leiijitli and in tlie amount of di\«'r;.;('iice from the dorsal
mar.iiin. They diver,<'(' iiioi'c stron.uly and are thicker and more promi
nent, especially at the inner end, than is usual in the tvnv hid(nt((tii.

Length of a medium si/e specimen 1.7 mm.: heij^ht, I'.d mm.

780

ri:()rii:iii\(;s or riii: y.triox ii. misi:i\i.

\iil . XX.

A t't'W st'iiiiralf \ :il\ ••>. oil' ( 'ape Hal tcias. Ntirtli ('amlina. in Mi to 17
latlioms. ISSl.

MONTACUTA BIDENTATA ( Montagu i, variety FRAGILIS, new.

(I'l.'ltr xcil. I'm-. x.<

Shell Mil)clli|tti('ai. !ii(M|iiiIiit(Miil, both t'lids broadly ioiiikUmI. thin,
fiauilc. coNfrcd with (h'licatc lines of growth. The nnibos are liiit-
tened; l>eaks Imt .sliyhtly prominent. 'I'iie teeth iti tin^ ii-;ht valve arc
stnallei' atid moie delicate than in the t\ pieal hiilciihitti. and di\('i',i;o
bnl .sli.nhll\ iVoiii llie<h)isal niai'.uiii. ns in that species.

lAMi^ith. I inin.: liei<ilit.."> mm.

One specimen No. KH.'Ui. station sKl-jT, in Nariaiiansett r.a.\. in
S.l to 10 t;ltlM)ms. isso.

MONTACUTA STRI ATUI. A, new species.
. IM.'ilf \CiIi. Il,u. !t. )

Siieli rather lai^ie. thin and sinnewinit hvaiine. comincssed. broad-
elliptical with t)otii ends \v(dl roniHle<l. the anterior mmdi tli<' lonuer.
Ant«'ro-doisal mar.yin nearl.\ stiai.yiit with a L;fa<liial slojic: anteriur
eii(' bi(>a<lly and re.u'iilarlN rounded, its ontlim t'orndii,u' niMi ly the sc^--
incnt of a cir<de; ventral inar,uin broadly ami evenly conx'ex; posterior
end bluntly loiimlcd wilh its dorsal marjiiii slij.ilitly coneaxciind slop
iny' rapidly. I inbos not swollen: beaks aente and nnl.\- a liltle proini
iH'iit. Sni'lace covered wit h line, re.unlar, concent ric. niicrosco|»i(' stri:i'
and moie distant lines of "irowtli. interior somewhat shinin,y with
inconspienoiis mnscnlar scars. Ilin,u'e-mai'^i!i lliin. delicate, oidy
sli<«htlv thickened. In the riyht valve there is, cm each side of the
beaks, a short, ra':her delicate, elevated. trian<iiilar tooih. termiimtin-
distiilly with an abrn])t sloj)!': these aie nearly e:|nal in si/.eand len-tli.
the antei ior one l)eiii,ii- slightly the shorter ami more an.yiilar. They ;irc
sepaiated l)y a V shaped notch, the sides of which foiin nearly a ri^ilit
an.ule. Ill the left valve there are two thin, slightly i»rondneiit eleva
tions. scarcely worthy the name of teeth, separated by a very wide
allele nnder the beak.

Lenjilh of one of the larj;est specimens, 7 mm.: Iiei<;iit. ti mm.

This species is mncli larji'er than any of onr other species ol" this
jieiius, and may possibly prove to be identical with .1/. hoiniKHii.
described and tignred by Holmes.' Owinj;', however, to the shortness
ol' the description and small size of the li«;iires, this (piestion eanintt
be delinitely decided without a careful tH)mi)arison with autlieiiiir
s]»eeimeiis.

A lew separate valves were found oil" Cape Hatteras, Xorth Card-
limu ill lo to 48 fathoms, 188o-84,

1 1'ost-pleioccMf fossils of South ( inoliuii, p. I'.U, j)l. vii. lig. 2, 18(i0.

i

T

+

1

\

5-— 7

.\<p. li:il(.

Itl'J.I'-WM i:i! Moll I >' I - I 1:1:1:11.1. .1 Ml I'l ^-11.

-n

i

MONTACUTA OVATA JiMfreys.

( I'lilli' \C1I, li-H. !>. 1(1.

I'lU'uiiiln I'l rnuiiiiomi \\MH\\\. Nuticr i<\' li't'^ciil Ail'l. lo M;ii. liivcil., I'l. :i,
\'Vnr. r. S. N;it. Mils., 111. |i. Ilin, IS.MI.

Monliiiiild iiriild .lll1l:^^s, I'roc. /.oc'il. .'>nc,, l.ipinluii, |). iV.ts. |.l. iai, iIm. I,
.hiiii'. ISM. \i;i;i;ii I., Iiiiiis. <'(>iiii. .\<:i<l.. \ . ]i. ."iTI. ISS'J; \ I. ]<. _'T!i. 1^>I.

A \ «T>' lew .S|(('cillini.>^. ;it fniil' sl;iti(»lis. nil' NcWlKHl. l;il(nlr Is1;iih1,

iuul <»H' .Miiitlias \iii('\ 111(1, ill l<i(» lo I'-T latiioiiis. l.SSO-Sl.

MONTACUTA TUMIDULA Jeffreys.
(I'hit.'s XCIII, I'm. (i: .\(1\\ ll-s. I. •_'.)

Moulin II til I II III ill II I II .li;ii ni:vs, l'.rili>h ( c me iml (!■;>. \ . )i. 177. pi. ( . liu'. .">. jsr.li.—
(1. (I. S.\i;^. Mdlliisca i.'cu. .Vrctirif \nv\i-'^\:i'. \> nil, pi. \\K li^-. l,s ,( //. 1.>'7n.—
\Ei.'i!li.i.. Tr.iiis. ('(Hill. Ai;i(l.. \ 1. pp. --•"'. '7!', js^l; l'.\pl. .Ilhiitm.-^.s. Ii'cpnrl
r. S. ('0111. Fi>li ami l-'i.^lici'irs fur is,^:;. p. ."i7.">. In^S"'.

OiK' live spcciincii and I luce \ iiKcs. at tlii'cr .staliiiii.s Itctw ecu N.lat.
4(P 7'. W. Ion,-;. •;: r>l'. and N. lat. ;;r 40' .•{()", NV. long. 74 M 4.". ,
in Si;5 lo 1,()1>1 latlioiiis, 1 ss; I- 1 SSI ;.

T

+

I

1

\

MONTACUTA CASTA, new species.
1 I'lair .\<'l\ . li;;. .-).)

Slu'U small, coiiiiircsscd. (il)loiiii-o\ atf, wiili tlic aiiU'rior ciid coii.sid-
erably tlie loii^^cr and bolli vwtls a'oout ('(iiially roiindfd. licaks small,
scarcely risinj>- al»(>\(' tiic marjiin. Siirlacc ci»\-crcd wiili line, rcuular,
inici'osc(M»i('. concentric stria' and distanl. rai>e(l lines of ^ruu tii. 'I'lie
Jiutero-dorsal marjiin is at, lirst a little inciirxcd. then slijilitl.\ convex,
with a jii'adnal slope; the anterior end is obtusely rounded : I lie \ cntral
margin is broadly and evenly rounded : the pusterior end is sliuiitl\
produced and a little aujuidated below, in some s])ccimens with I he
dorsal margin slopin,u' moic rapidly than tiie anterioi' and sli^litly
ineur\-ed ni'ur the beaks. The liinjit' inarji'in is thin and delicate, in
the ri,i>ht valve thei'e ai'e two nioderattdy thick, rather prominent Icet h ;
tli(! one behin<l the beak is shorter than tlu^ other, with a more alirupt
jxisterior slope; they are .se]»arated i'rom the slightly thickened maii^in
by a dee]) yrooNC and from each other by a lar.^c notch i>r an;L;le. the
sides of which form an an.ule of about DO". On the thickened margin
there is a thin. r()u<>li, sliallo\\ li^amentary furrow both in front of and
behind the beaks. In the left \al\e there is an elongated, thin, and not
very prominent, tooth like elevation on each side of the lieak; they are
nearly equal in si/e and separated by a very bi*oad anule.

Leiifi'th of the Iars>est specimen, abiuit 2.1 nun.; heij^ht, about l.S mm.

A lew separate valves, otf Caiie liatteras, ^"orth Carolina, in 1 I to 17
fathoms, 1884.

m

1^2

i'ii()Li:i:inst,s or riii: smkisai. mi >/. / m.

Vol.. XX.

MONTACUTA CUNIilATA, new species.

(I'hii.H \* I, iiH. I; .\(iii, li^. : .)

Shell SI 1 1 ill!. ('I(tii;.;;itr(l. w t'd^r sli;i)»ri|, with :i iiiiich iHdtJiicrd. ii;ii'in\v
iiiitt'iiur ciitl. ;iii(l with tlir duisal nmruiiis in';iily >t iiii;.;ht, siopiiiy' ijip.
i(ll,\.iilitl rniiniii^ iiii olilii.-«(' ;iii;;l(' :il tli<' IhmK^, wliich HIT (Icciijcdl y
lirhiiid ilif iidddlc. pruiniiM'iit, nirxtMl inward. .\iilt'ro (h»r.s;il niiiiuin
sln|»iii;^ iMpidiy. at liist nearly st raiyht. hccuiMiii;; a litl le eiin\'e\. and
em vin;:; lejiulaiiy into tlie v«'nlral niar;:in. Ilins loiniinj; a soniew hat
rostrated, njinow , e\enly ronnded anterior end: vential Mnir,iiin nearly
St iaiL;hl. soniet inies with a >li.iiiil inn ir\a tare ojiposiie the heaks: |Hi>te-
rior end Idnntly ronnded, wit h its (hasal niar,i;in nearly slraiyhl, slopinjn'
ahont equally with t li«' anterior, 'i'he sin I'aee is eo\ered with line, eon-
eeiitiic, rather reuiilar lines of l;|(>\\ th and miei'osco|iie striatioi.s. Into-
I lor somewhat shiniiii;. In the riyht vahc there aie two well delined,
pidniiiieiit. tlii'keiied leelh. separated iyy a laiiii. deep notch niidei the.
beak: t he anterior one istlie larger and is i»roadly t rian;^iilar. wji h a
pr(»niinent e.xeiirved tij), and is sepaiated Ikmii the hinnc inar;:in liy a
deep I'nrrow. which runs ohlicpiely within and l)el(»w t lie thickened doi sd
niar,nin: the posterior one is set ohiiipiely to the in .ii^in. t'roiii wliich it
is se|»araled liy a well delined i;roo\-e. In the lelt \al\e there i'^ a wide
notch lieiicath thelteak. uitli a rather iiiroiispicii()ii>. td nj:ated, .vniiie-
what thickened anteiior tooth like projection, wliich continues tuiward
as a thickeiic<l inner iiiar,i;in nearly to the end. and a slioiter. hioad.
ti'ian.iiiilar jiosterior projection. Color cream-white, soinetiines tin^^cd
with pink.

Length of tli(> lar<>v.st .speeimeii. ilioiit ■"> mm. : height, l.omiii.

A few specimens were found oil' (Jape llatteras. North Carolina, in
l'> and If! fathoms. 1S.S;5-SI.

«/>

MONTACUTA TRIQUETRA. new species.
(J'l:iti3 XCI, \\'^. :',.)

Shell small, covei'ed with reiinla'' »ncentric grooves, seaveely cnin-
])resse(l. somewhat triaiiji'ular. with a sliiiiitly rostrated.aii.n'iilar posteiior
end, and a re,i;iilarly rounded anterior (nie. I'mhos a little swullcii.
beaks nearly central, i)oinfed and a little pioiiiineiit. 'i'he anterior and
])osterior dorsal maruins form iieail,\a riuiii aii.yle; the anterior iiiaiLiiii
is sliL:htl.\ convex and passes jui'adnally into the somewhat hluiiily
rounded anterior end: Ncntral marj^in broadly convex, becoinmn'
sli,i:litly ineurxcd toward the posterior rostration. wliicdi is wcdue
shaped, rapidly tapered, with a narrow truneat(^ tip. defined belnw hv
51 iaint. radiatin.u' ridjie; postero-dorsal mar<;iii is nearly straiji'lit. and
slopes rapidly from the beaks. The surface is sculptured with stroiii^ly
marked, smooth, rounded, eoneentne ridycs havinji' the upper cdye
smooth and lecurved; these are separated by deep, rc;;ular grooves

J

1 -\

^%

V

nm. ii;i'.'.

Di.i.i'-w \ ii:i; Mill I.I SI A-\ i:i;i:ii.i. i\/» in su.

"S.'J

wliiili ;i|>|>i';ir in mhiic ii|;iit> tn 'Ntciitl IicimmIIi iIic ii|)|ifi cduc nl ilic
li(l;i«'s; (III t lie iiiiihos ;niil iM>.>lcii<>r lost riilii I ln-sc lid^ics ;iiitl :^|(mi\i's
ln-((»iii«' Icrlilc :iii(l irrciiulai-. like liiu's (»!' ;;io\v|li. I iitt'ni;ill,\ llif>iir.
I;itr i.>\\liil<' ,\\\\\ siiioolli, with the imisciihir ^cais liitlicr stMiii^lv
iiiai'krtl.

Tin- iiiii^fiiiar^iiii is ratlicf tliick: in tlirii^ht valsr t lific me two
stroiiu. nioMiincnt . cnivi-d. canlinal trrtii. separated l»y a larye. >iiine-
what ol»li(|ne noteli wiiieli extends npwaid intu tlie I teak: t he p.istei iur
toutli i-^ the iniri'Dwei' and nmre piotiiineiit. with tlie tip eni-\ed I'o.'wukI
and upwaid; the anteiim Inoth is ennneeted. jnst in iVuiit ufthe l»e;d<,
li.\ a luiil'ut' like e\tensi(»n to tlie I'xteiinil maiuiii. h'avinu' itetween tin'
(oolh and t he inai'iu:iii a deep sni>niiii',ii'iinil yiooNc; tiie inner edj^e of
tile hinL;('inai,nin is a Ut t le tliiekened to foi ni a rid;jc eontinnons w it li
theanleiiof tooth. In liie h>lt xalvetheic is a distinct ih)teh nmh'i'
thi' iie.ik lor the eartilaue or resilinni: in front of this is a |»ioniineiit.
tooth like thiekeidn^' of the nniruin of the shell, the proximal end of
w hii h hecfMni's ti»oth like. l)nt is eoid ininnis w itli the rest ot" the liin;;t'
margin: behind the noteh I here is ih) todt li and I he inai'^in is only a
little tiiiikened. withonl any s|)eoial ;• uninence.

Length, altoni L'inin.: height. 1.1 nii;

'I'Wo valves, station L'MOT. off Cape llatteras, North ( 'aiolina. in III
fathoiiis, 18SI.

TELLIMYA FKRRUGINOSA (Montagu).

I i'i:iic \>', lij:s. 7, s. )

rdl'innjii J'l rrii<ihii>f«i II ;niil A. Aoams, (irn<M;i l.'ccfiit Moll.. II. ji. 17!', 1H."S.
Miiiiliiiiilii firnujhioxd .]\:v\ \\v.\>, !'..iti>li ( niiili(il();4\ , 11. ]). L'ln. iso:; ; \, p. 17s,

|)1. \ VNI. liir. !». lS(i!t.

J'llliiiiiiii I'l rrihiiiiond (i. ( ). Sa1!s, MoIIiisi',1 licy. Ardicii' .\or\«)L;i,i'. p. "n. pi. -'n,

li,i:s. 1. "-'•. l^TS — \iaani, I , Trails, rm.ii. Aiml.. N 1. -'-"i, pi. ws. li^-. VX IMXI.

UoiiliKiilii frrriijiiiiiisii I'isciii'.i;, Mnniii-l ile ( tmctiv liiiloiiic. p. 1027. lij;. 77."). ISS7.

iilliiiniii l'rrni<iiiio:^a D.M.I., Hull. I'.-'^.Niir. Mmh.. NO. :)7. ]>. ."lO, i>I. MA.tin'. i;{. tSS!t.

A few specimens were tbnnd at low water at Woods Hole, Massa-
chusetts (( 1 nt of ('anso).aiid (liitters of Xaushon Island. ISSi's;;. 'I'hc
lij^ineof the liviii;^ aidinal published by N'errill in ISSI has been copied
by Dall. Fis( her. and others. We now yive additictnal ones,

KELLIOPSIS, iK-w cjtuius.

I't/pc. — MoiitdCiifii lirratd Stini]tson.

The shell, in size and form, icsendjles h'lllid ami Moiihirnld. In
both vaives there is a small, prominent, anterior tooth and a low,
eIon;;ated. thickened posteiior ridi^e. scarcely amonntin^' to a tooth.
The resiliiim is larjie and is attached to an elongated, obliipie e\ca\a-
tion on the proximal eo^e (»|" the posterior tooth-like ridjic and also to
a trian.uular ])it beneath the beak: it bears a large, elongated, ciirveu
ossicle. Soft parts not observe<l.

\U

Mili

(X

i'i;()( i:i:i)is(.s or riii: \ iTiaxii. i//N/;ri/.

Tliis <4<'inis :ii»|)c;irs lo be closely allied to MoiilKciifa. l»iit dillers in
not haviiiu' :• dcliiiite. raised. |)(»steri(>r tooth: in liaviii<>' a lar,ue, elon-
;;ated posterior eartila.^c. bcariii.y- a lai'<;e ossiele uttaebed to a special
jii'oove aloii,!^ a tootlilike ridiic; and in luivin-i' tlie structure of the
hin-iv in both valves nearly the siiine. In the position of the resdiuni
it lesenibles Er^-hta, but the latter has two lar.ne teeth in both valves.

KELLIOPSIS ELP:VATA (Stimpson).
,|-|.'it.s MM II. li-s. L'-l; \(I\ . lisH. 7, S.)

Moiil'iviitii hnhiilalii (ion. II. I.'cp. <in Invert, of Mii.-i.s., l-I I'll.. ]>■ ."it, isll. Not

ol' .M(iiitai;u. >
Muiiliiciilii (!('.;il(i SiiMi'xiN. SliclU of New I'.ml:.. |>. Hi. is.M.
Cildiiiiinii (lirtiliiiii 11. and .\. Adam-. (Iciicim l.'cieiii Mull.. II. p. 177. 18r>S.
Moiilaiiilii clt-nild (iot l.D, lie]". <m liivt-n. of .M.i.ss., r.iiinf,v"s ed., ]). SC. li;^-. liiKi,

1S7(I.— I'lMON, .\mcr. Mar. (OIK li.. ]). 17l'. }>l. wxiii, liu. HO. ls7;i.— Vkiumi.i.,

i;f|uiil liiMit. An'mi. of \ iiicyaid Sd.. in 1st K't'p. I'.S. l'i>li Com., pp. MIM,

tiSS, IS7I ^antll. cop., p. I IS).
IWunijii I'leviilii ItAi.i., iinll. I'. S. Nat. .Uiis., No. :<7, p. .Mt. pi. i.w iii, lig. i; .as

Moiiliiciild ilcnihi Stiiui).soii 1. ISSli.

This rare species has been obtained at low water mark, at .Sa\iii
Kock. near New Haven, Couneeticut (.1. Iv Todd), 1S71; Welltlecl,
.Massachusetts (Webster), ISTl); Woods Hole, .Ala.^saeiiusetts ((hit of
("ausoi. bSS-J; Naushon Island (dutters and Sheep I'en Cove), IsSi';
and Narra,<;an.sett Hay, in S.\ to l»i fathoms, 1S8().

« ■«

Fanuly 1 )1 1'LODONTll ).i:.

I'lHlHliiiidii I'isi iiKi; : hiplinutnt'idii + Vriiptodoiil'id'i l>all.
CRYPTO IDON Tuftoii,-|S22.

Tijpi.—Criijttoihn jU'.niosiis [ MontiljiU •.

The typical. species of this yeMiis have no distinct teeth in either valvo,
but the inner marjiin of the hiuji'e plate is more or le.s.s tlnckened or
swollen in tVont of and behind the beaks. The lij;ament is i)osterior and
lies in a lou.u', curved furrow in the midst of the nnirji'intil tiiickenin- ;
wheie it commences at the beak it is marginal and external, but as it
runs backward it recedes from the edj-e iind becomes more oi h'ss
internal and invisible from the exterior. Moreover, the posterior end
of the shell h:is one or more <listinct radiiil corrugations or plications
to ,uive the thin shell stren;^th enouj^h to resist the action of the lar^o
post<'iior adductor musch' whi<di is attached directly upon the princi
pal plication. The pedal muscle is tittached to the ui>per i)licatioii
when the latter is present. Many writers have adopted the name of
A.iiitHH Sowerby, isi*;*,, for this <>cnus; the latter Uiime was f;iven to a
tertiary species, the structure of which is not fully deteriidned. It may
belonji' to a very distinct {r<Mins. Moreover, Turton's name seems to
have actual priority of publication.

i

NO. IKi'J.

DEEi'.w AiKn MoLLi s(j—r]:j;i;i/.L .IM> iirsn.

785

CRYPTODON GRANDIS Verrill.

CriiplodoH (jrniidia \i:i;i;i[.L, Trails. Conn. Acad., VI, ]>. \'M\, pi. xr.iv, tin'. L'J, IW.");
Kx])!. Jlhalross, \{f]H)rt I'. S. Com. IMsIi /ind Fishciifs I'm' issii, p. r.75. IMS."). —
Dam.. Itiill. I', ^i. .\iit. .Miis.,No. ;{7, ii.."(). i>l. xi.vi. i'm. I'L', ISS'.t.

,Silii;()lIiii rii8 i/rinidii {iHtrn) Iax'.vud, Caiiipayuo dii '' Candnii," Aiinalfs (!<• I'lni-
veisiU' do Lyon, p. 1)^0, 1S9().

This large siiid iiitcu'stiiig sjx'oies, described in detail and wril lifj-
ured in tlic first article (juotcd above, is a tiiic ('niitfothni, 'd\lh(n\'^\\
\ery distinct IVoin any of oar other species. Tlierel'ore it seems stranj;o
that jM. Locard has referred it to the Ae.ry dill'erent j^enus, Sclii:(>fli<iri(s
of Conrad, which l)el()n<;s to tlie Mactridir. Ih- ident ilics witliout (|ues-
tion a> sinjilo valve, <lredjied by tlie C((ii<i<ni off the coast of I'rancc. in
1,71() meters, as our species. It is, tlierel'ore. doubtl'nl \vlieth< r liis speci-
men is congeneric with ours, for the latter certainly has no aflinity with
tSclii.:()tli(iri(,s.

One live spe(;iTneu and a few separate valves \V(>re drcd^-ed at tlirce
stations between N. hit. ;5So 2<)', W. long. 7;P H'. ami X. hit. .V. > W 50",
W. loiiy. 7.P 57' 40", in O.'.S to 1,582 latlionis. ISS.l-Sl.

CRYPTODON INSIGNIS, new species,
d'lafr \CI, li.us. I,L'.)

Crjiptixloii unrKii \'i:i;i:ii.i., I'lnc. I', S. .Nat. Mns.. til, p. ;i'.i:i, ISSO; 'I'rans. Cdnn.
.\<:id.. \'. ]). r>70, ISSL'.

Shell unusually larfje and thick for the ucnus. opa(|ue wiiite or
tin<i('d faintly with reddish internally. Outline somewhat variable,
usually broad ovate (U* sulxpiadrate. usually moderately swollen, some-
times rather compressed. I'mbos moderately lar.ii<'. not \ei'y promi-
nent; beaks small and turned forward. Liinule coidate, rather lar.nc,
j>retfy well delined. The radial folds and lobes are less marked than
is usual in this oeniis. .\ well-inarked fold or shallow undulation
extends from the beak to the posterior niarjiin, opposite the scar of (he,
adductor muscle; anterior to this there is abroad, sliiihtly raised ridn'c,
e\tendin<;' fiom the umbo to the siphonal lobe of the niarj^iii; in front
of this there is usually a broad faint depression of the surfa(;e which is
scarcely api)aieiit in many .specimens; a posterior oroo\-e iiiiis close to
and nearly ]»arallel with the jiostero-dorsal mai,i;in. The antero dorsal
)iiargin, in the lunular re,i:ion, is straight or sli.i;litly iiiciiive(|; tlio
antei'ior end is short, a. little ]U(>miiient below the liinule. and olitiisely
rounded; the ventral niaroin. is very broadly rounded, usually with a
slightly more ]>i'omiiieiit lobe at or just bcliind the middle, w ith a mor<i
de(!ided but obtuse projection (siidional lobe) lait her back where itjoins
the jiosterior margin, which is usually somewhat incurved. correspond
inji' to the- external wa\'e like de|)ression, becomiiiji' coii\-e\ o|)|)ositc t l;e
posterior external fold: the postero «lorsal mar;4iu slopes raiiidly froii.
tlio beak and is sometimes broadly rounded, and at others sli^hl ly con-
vex. The surface is covered with couspicuous, mure or less irregular,
Proc. N. M. vol. XX 50

786

rnori'jEDiXGs of the nattoxal museum.

VOL. XX.

roniuled, obtuse, olU'ii pioiiiiueiit lines of growth with a tliin yellowish
brown e|)i<leniiis which, under the lens, is closely covered with minute
granules often arranged in more or less distinct concentrit! lines. The
posterior hinge-margin is somewhat tliickeued, the ligamental groove
is long and <;urved, <livergiiig considerably from the margin of the
shell at ils jxistcrior end and extending forward under the beak. Mus
cular scars and palliallinein the largest specimens strongly marked ; the
anterior scar is considerably elongated and has a number of lobes or
scallops on its inner margin.

iiength of a. medium sized specimen, L'7 mm.; height from siphonal
lobe t(/ beak, L'7 mm.; bieadth, 11 mm. Length of a larger, more ovate
vspecimen, .'Jli Uiui. ; height from siphonal lobe to beak, .».") mm. ; breadth,
21 mm.

This s[)ecies ])re8«'nts considerable variation in outline and in the
degree of convexity of the valves; some are sulxpiadrate in form,
others subcordate. and others pretty well rounded, but the majority
are i>b]ong obvate Avitli a posterior truncation, corresponding to the
broad radial groove; some of the valves are considerably inllated, but
most of them are mor(; compressed than is usual in this genus. There
is also considerable variation in the i)rominence of the siphonal lobe
and broad radial ridge, and in the size of the lines of growth, which in
some specimens are <]uite tine and regular, and in others nneveidy
de\eloped, those on the anterior part appearing almost like conttentric
ribs.

Many separate valves, at four stations between X. hit. 44° 5l', AV.
long, mo 4(J' 45", and N. hit. V2o 11)', W. long. (itP 47A', in G") to 171
fathoms, 1871> and 188;").

The single valve I'ound otf Cape Cod, 187!», and identified as Cryp-
todon fiarsii, i)roves to be the young of this species. .

CRYPTODON PLICATUS Verrill.

(I'liito lA'XXIX, n,u. (1.)

('riiiitinlou pricaliig Veurili.. Tnins. Conn. Acial., \I, pp. -VAT, ir)(), 18S.").

One young live specimen and one imperfect valve of this character-
istic and fragile species were found at two stations, olf Marthas \'ine-
yard, iu 1,073 to l,lL>li fathoms, 1884.

CRYPTODON CROULINENSIS (Jeffreys) Smith.

(I'liitoXC, liys. :{, 4.)

ClniiniiKi o'oidinriiKis .Ikkkhkys, Ann. Jtat,'. N^at. Hist,. XX, p. 19, 1817.

Aj-iiiim iioiiliiicntiiti Jia I'UEVS, Biit. Con., II, ]i L'.'id, ISdl.— (;. <*. Saks, Molliiscii

Ivoy. Aniticio Norvej>iii', p. 62, pi. 19, ligs. 8, a-b, 1878. — .JM'^mcvs, Proc Zoiil.

Soc, London,]). 70;i. I uiu', 1S81.
Criiptodon cvoiiliin'iiniH SMrrn, \]. A., Kcporl Voy. VhulU'iujtr, Zool. Liunolli-

l.riuichiata, XIII, p. im, 1885.

Shell small, oblicpiely subovate, with the beaks prominent, and the
anterior end considerably the longer. The autero-dorsal margiu is

''

■

i

i

t

NO. 1139.

DFfji'-ir.rn:/; Mor,i.rs(\\—vi:ui;iLi. .i\n nrsu.

787

''

is

nearly straij^ht, slopiii";' rii[)i(lly fVoiii tlic; beak : the anterior cud is dis-
tiiictly produced, OAeiily rounded; t\n\ ventral niar<;in is slji^htly but
rejjfularly convex to tli(^ lower ])osterior loM; the posterior end is
marked by two distinct plications separated by a rather iirondneiit
ridj^e which, at the inar<;in, appears as a rounded ])r()jevition separating;-
two reentrant curves; the jiostero dorsal nuirjii.'i is convex, sloping?
rapidly to the up[»er plication. The li.i;anieutal aiea is relatively Uir<;e,
long, elliptical, delined by a di.stinct gioove. Intei-nally the liinj;e-
inaryin is consiibnabl}- thickened, especially directiy under the beak,
where there is a. slight swelling; the jtosterior ligament oceuities a
very distinct groove, and extends forward under the tip of the beak.

Length, 3..") inni.; height, 3.ir> mm.

The shell heie referred to this species api)ears to agree well with the
ligures and descri[)tioiis given by (1. O. Sais. It preity closely I'esein-
bles .some varieties of ('. (joiihlii. The prinei)»al dilferences <'xter-
nally are in the somewhat more pro<lnc».'d anterior end and the lonuer
and straighter antero-dorsal nuirgiu: the posterior plications are also
less strongly develo[)ed.

Found in small iiuad)ers at about thirty stations north of ("ape Cod,
between N. lat. i3' UA', W. long. (i!» l'l>', and N. lat. 41.'"^ .iO', W. h»ng.
70^ 38', in 13 to 73 fathoms, 1873-1STI>.

CRYPTODON CROULINENSIS (Jeffreys) Smith, variety ALTUS, new.

(I'hitr I. WW III, li-s. I, -2.)

Shell higlu'r than long, larger than the <'onnnon foiin. limbos i)romi-
nent. elevatecl and turned forward, so as to leave a rather large, con-
spi(au)us, tiatteued, luiiiilar area, which is bordered externally by a
slight ridge, followed by a concave depiession in the surface, which
forms a slight indentation in the anterior margin, and resend)les the.
p(»sterior plication, but is more shallow. The antero-dorsal nuirgin in
the lunular region is slightly concave, but slopes very rapidly; the
anterior end is a little nioic produced than the posterior, but both are
decidedly short; the ventral margin is pretty evenly lounded ; i>oste-
riorly then> are two distinct i>lieations; thc^ lower or larger one is mod-
erately sunken aiul extends from the beak t<» the posterior margin,
the upper one is much shorter ai;d narrower and delines the narrow,
lanceolate, ligameiital area; each produces a decided indentation in
the margin, that caused by the lower one Iteing more sharply delined
and shorter than the other, these are sei»arated by a well-defmed,
curved, radiating ridge which extends a little below the margin; the
jHjstero-dorsal margin is strongly convex, evenly rounded, with a rapid
slope; the hinge margin is e<»nsiderably thickened, especially beneath
the beak, and in the right vahe forms a distinctly raised tubercle.

Length, 5 mm.; height, <» mm. I'-astport, IMaine, 1S70.

Auother specimen, from station -!>!-*, is slightly smaller. Length,

788

i'i:nc/:i:i)i\(;s or tin-: xatioxm. misium.

vol,. XX.

L

l.."> iiini.; lK*ij;lit, ."i.L*,") nun. In tliis tlio anterior or iipix-r plication is
much loss <listin(;t than in the, type, iiiid it is tiicrelort; possible that
this feature is abiioi nial.

CRYPTODON EQUALIS, new species.

(I'llllr \([, liiiS. .".. C.)

Sliell ol" moderate size, {ji'a\ isli wliite, rather swollen, ])yrifbrin, usu-
ally a little lii.u'lier than loii.u', but sometimes the height and length are
about efpuil, Cmbos lathcr pniminent: beai;s median, conspicuously
raised above the mai'gin and cnrved stron.uly forward so as to proibu-e
•,i rathei' deej*, bioad, cordate, but ill delined binular aiea. Anterior
and posterior ends neaily equal, The doisal margin sIojjcs rai)idly on
Ixttli sides of the beak: anteriorly, in the bnnilar re,ni<»n. it is nearly
straiju'ht; the anterior end is ])rc1ty eveidy rounded, Ibi'nunj;' a continu-
ous curve with the ventral nnir.uin, which forms lu-arly a semicircular
ciiive; the posterior end lias one broad, shallow undulation which
causes a slight incurvature in the postcro-ventral margin; above this
the dorsal mai.iiin is very slightly convex and Ibrms an an.iile at the
commencement of the told. The lif^anuMital area is marked by a smooth,
lonj;', lanceolate, sli<ihtly sunken portion, clearly sejiarated by an
inci.sed liiu'. The j;eneral suit'ace is covered with slightly marked,
moic or less irrc.u'idar lines of growth. The hin;i<'-niar.i;in is moderately
thickened and is essentially the same in both valves. There is a well
marked swelling;- both betbie and behind the beak and a more con-
spicuous one imnu'diately uinlcr it: a less conspicuous thickeninj;', with
its external c(l,i:e e.xcnrved. extends alon.u' t!ie ]tosterodorsal margin,
in the li.uamental region. .Muscular and pallial scars indistinct.

Jjen.ii'th, ."> mm. ; height,.").] mm.; thickness, t mm. Some specimens
are somewhat lai'i^cr than this.

In the lar,iie sei'ies which we have i-f this species there is some
variation. In sonm cases the form is less swollen, tlie length is
slightly in excess of the height, so that the general outline is more
evenly I'ounded. The S])ecies is, however, notable for the e(|uality of
the anterior and postcrioi' ends and the [irest-nce of the single slight
undidation. Crinttodon iioiihlii somewhat resembles this species, but
ditfers in being longer in i»roportion to its height, in its more com-
pressed form, ami in having two distinct folds or undulations. It is
also closely allied to C.Jhriiosits of iOurope, but is more pyiitbrm in
shajM' and hu'ks the aiiteiior angidation noticeable in that s[)ecies.

Taken at thirty two stations, between N.lat. 47"^ 10', W. long. -17^ 3.")'
.".(»", and >;. hit. M OS', W. long. 71 :VV. in '.M to l,o;;7 fathoms, 187.'!-
1S8(J.

CRYPTODON PLANUS, new species,

(Plate LXXXVJII, li^rs. ;?, |.)

Shell small, wellrouiuled, the length and height about e(|ual, Avitli
the beak small, promiueut, nearly central, curved strougly forwurti,

I

V'Tl

13!).

in'F.i'-WATEi; Moi.i.i s(A—\i:]n;ii I. .i\n ni sii.

7. ^9

^1

i

tbniiiiij^' n siiKilI. siinlicii. liciirt sIcijkm!. luiiiil;ir Mi'ca. I'ostcrioi'Ij-
tlicic i.s only ii fiiiiit. (i('|»i('ss«'(i uiidiilatioii. w liidi causes l»iii ;i sliirlit
indciitiitioii or aii.nuliitioii in the niar.yi!!; Ix'liind this tlic snrt'acc i-ises
sli^^litly and Ibiins an incoiisi»icu()Us I'idov snn'oundin.u' tiic liiiaiucntal
area, which is h)nj4'. rather nai r<»\\ . and sunken, so that its iiiar.i;in is
scarcely visible in a side view, 'i'lie dorsal niarjiin is a little conxcx
and slojyes but little, and about eijually on botii sides of the beak: the
anterior end is widl lonnded and sli^^ht ly prcMliu'cd : t lie ventral inar<iin
is broadly rouinled, a little i>rodnced in the middle, and nearly >trai.uht
or very sli;.;htly incnive<l ])osteriorly. opposite the undulation; behind
this t here is a slight obtuse angulation corres))oiidinj'' to the ridiic lielow
th(! li,ii:unental area. Surface dull <;rayish white. 'I'he hiny*' nnirjiin is
<'onsiderabi\' thickened, especially Itelow the beaks ami luiiular area.
ami a thickened lidyc also extemls Itackward beyond the lii^aniental
area. Tliere is no distinct tubercle nor tooth like projection. Tlu^
]K)steri()r li,uainent is unusually stron-i. and occupies a ratliei' consi>icii-
ons subinar^yinal ji'roove wlncli runs forward under the beak as a thin
incised line.

Lenytli, 4 mm.: hei<;ht, the sanu'.

l''ouml in S to !(•() fathoms, north of Cape Cod, in the ( 1 id f of Maine,
Casco l>ay, I>ay of l-'undy. and Halifax llarbitr. is7i.'-l,s,s.").

I

i

CRYPTODON OBSOLETUS, new species.

I'lillr lAWIX. liu'S. 1. L'. .

Sliell small, hi,ulier than hui;.;'. with the ends and \'entral mai'u'in
rounded. Cmbos .somewhat promiiu'iit and swollen: beaks cuivcd
stron<;ly Ibrward. Posterior plication ol)solete, or neaily so. only
visible in certain ])ositioiis, and imperfectly defined by a faint undula-
tion of the surface and mariiin. i'he aiitero dorsal niaruin is slightly
convex in the lunular area, and slopes lapidly to tlu; broadly rounded
anterior nnir.^in with which it tonus a vers slight and \'ery obtuse
anyle; the whole ventral mar.iiin is well-rounded, a little produced in
the ndddle: tin* i)()stero-(l(U'sal maruiu is l)roadI.\' convi'x and ends
distally in a \ cry obtuse, i-oundcd an<ile, al)o\-e which there is a sliuht
iid)endin.n of the ed.u'e. The hinji'c ]ilate is rather t hick, especially pos-
teriorly. The li;.:aiuent is rather str()ii<>' and considerably cm ve(i ami
occujiies a narrow, but very distinct j^roove, mostly within the marj;in
l)()sterioily, and extends forward under and in trout of the beaks. The
anterior hinji'e-inar^'in is thickened and a little tlexuous toward the
anterior angh' of the shell: the in'oximal end. Just under the beak, is
slijihtly thi(tkened without Ibrnnnii any apparent tooth. I'nder tlu^
microscope, the surface is covere(l witli rather coai'se. iri'cunlar, con-
centric undulations, and line, raised lines of jjrowlh, bec(miin^ smoother
at each end, wheie there are ])atehes of a closely adher«;nt coatinj;' of
red mud and iron oxide.

Length, 2.4 nun.: height, L'.d mm.

mmmmm

790

rnocKEDrxas or riri: xatioxm. MrsFinr.

vol,. XX.

Four speciiiiciis, at three stations, oil' .Alartlias N'incyard, in KK) to
;{!l(> tatlioins, 18S0-1885.

AXINULUS, new subgenus or genus

Tjipe. — A.i'iinihis hrcris, new species.

We ]>rop()se tliis division to inelnde tliose s])e('ies wliieli aj^ree witli
Cruiilodoii in tiie eliaiaeter of tlie liin^c and liuanient, bnt lack tln^
plications oftiie shell, and iiave, therelore. a snialh-r posterior addnctor
niusch'.

CRYPTODON (AXINULUS I BREVIS, new species
(Tint.' I.XXXIX, li-^H. 7. S.)

Shell small, short, tlie lieij^^ht exceedinji' the length, somewhat pyri-
form, with slightly prominent und)os and small stU)central beaks, which
are but little ]>ronnnent and turn forward. The antero and postero-
dorsal niar;4ins are al)ont eipial in lenj^th, the latter sliyhtly more
broadly rounded than the foi'mer. which is a little incni'ved neai- the
beak so as t(» form a very sli,i>ht lunnlar area; both ends arc^ broadly
rounded and nearly equal; the ventral mar<;'in is slii>htly (ionvex and a
little produced Just in front of the middle; an exceedingly faint,
seai-eely discernil)le undulation runs tVom the beak to the ))osterior
ventral marji^in. The suilaee is covered with very line, close, i)arallel
lines of gntwtli visible only when much magnilied. (Jrains of line fer-
ruginous sand or mud usually adhere closely to the suiface, both ante-
riorly and posteriorly. The i»osterior ligament is well dc^veloped and
oecui>ies a well-marke(l marginal groove: a small, thickened, more
internal portion, situated Just behind the beak, within the margin,
appears to be continuous with the external ligament. The inner edge
of the dorsal nnirgiu is slightly thickened, for a short distance, Just iu
front of the beak.

Length, 2.\ mm.; height, 2.5 min.

Several live specimens and sei)arate valves were found at six sta-
tions, between X. lat. 40 10' M)", W. long. CT^ ,V l.V. and X. lat. aS^
2L", W. long. 70^ 17' 30", in 084 to 1,825 fatlioms, 1883-188(1.

At station 2208 was tbund a single imperfect valve closely resem-
bling this species but of much larger size.

Length, 5.5 mm.; height, (i.5 mm.

It is, however, nuich less legular iu outline, having a nearly straight,
ra[)idly sloping antero dorsal margin, merging very abruptly into the
broadly and very slightly curved and sloping anterior nnirgin, forming
a somewhat angular and little i)roduced anterior end: ventral nnirgin
strongly convex, curving gradually into the ixjsterior margin whicii
slopes rapidly from th'.'. beak; ])ostero-dorsal maigiii is convex but
rises only a little above the outline of the distinct ridge which border
the ligaiueutal area.

«^

NO. IIM.

T)i:ei'-wati:i! Mtii.Lrsc.i—vKinui.i. asd i:i sii.

701

CRYPTODON CAXINULUS^ INF.QUALIS, new species.

(I'liitc xr. n-s. 1, 2.)

Slieil siiKiU, soiiiewliat oblonj;, with the nntciiof t'lid iinicli tlir longer,
Unil)'>s rather i>roiiiiiM'nt, hcaks elevated, eiiiNcd strongly t'orwanl, so
as to h^UAe a small, (leej) limulai' area. The aiitero-dorsal inar^in is at
lirsl nearly straight, slopiitji' Imt little, and is nearly |tarallel with the
ventral margin: the anterior end is produced, broadly and eveidy
roniuled: tin; \entral nuirj^'in is ninch less ronnded. with the nn'ddle
portion almost straiuht for a short distance, towaid tlii^ posterior end
it is sid)trnncate and slijihtly anjinlated : the postero-dorsal marjiin is
convex and sl(»|>es rapidly; a veiy slij^ht depression ri;ns Irom the
beak to the postero ventral nuir^in, bnt is so sli<ilit as to be scarcely
worthy the name of ]dication or told; posterioi" to this there is a dis-
tinct snbinarji'inal rid^.-c se])arated by a lather deep jiioove. from the
liji'amental area, which is lon<i" and nariow. The snrfacc appears (o
the naked eye nearly smooth, blnish white: under tli<' micros<-o])e it is
marked by slijiht, raised, concentric rid.i;<'s and faint undulations,
which are the; most regular and distinct on the and»o.s. in addition to
these the whole surface, when hi.iih]y nni,i;nilic(l, has a line librons
ai)pearance: on some i)aits theie are remnants of a thin, pale yellow-
ish epidernns. The hin.neuiarjiin is distinctly thickened, with a, slight
]»rotnberance directly under the beak, wiu-r*! it is thicker than else-
where. The ])osterior liyament is rather lar<i'e and sfronu. and occu-
]>ies a consiucnous groove extending from under the beak about one-
third the length of the postero dorsal nnirgin,

Length, 1..") mm.; height, 4.2.~> mm.; thickness, about 4 mm.

2V few specimens have been found in 11 to \\) fatiioms. at about eleven
stations north of (,"ai)e Cod, in Casco Bay, and in llaliiiix Harbor,
1873-1875).

CRYPTODON (AXINULUS) SIMPLEX, new species.

(I'l:ifo XCII, li<,'s. :;,!.)

Shell snudl, tliin, fi'agile, translucent bluish white, somewhat intiated,
nearly circular in outline and witliout any i)osterioi' undidations. Hcaks
small, acute, slightly ])rominent, turned forward. Antcro-dorsal mar-
gin excavated in front of the beaks an<l convex farther forward; ante-
rior nuirgin broadly and evenly rounded and, with the ventral nnirgin,
forms nearly a circular curve: the ])osterior margin similarly rounded,
but slightly tiattened in the ndddle; ])(»slero-(lorsal margin broadly
convex without any distim-t angulation jtosteriorly. The surface is
nearly smootli and sonuMvhat glossy on the undtos; it is marked by
rather indistinct, sum 11, concentric waves or undulations and ndcro-
seo])ic lines of growth. Interior somewhat shining. The hinge-margin
is thin. deli(!ate, ami very simple, «ith but a very sligiit thickening in
the region of the beak; a narrow groove Ibr the ligament is visible Just

ummsLosssimmmmmim

!)•_*

ri;nci:i:iti\(:s or rni: \ irmwii. i//v/;r.u.

VIII,. XX.

bcfon' iiiul hci'iiHl the beaU.s, l»iit tlicrc i.s no tootli-like pioiuiiieiice at
any point.

Lcnj^tli, about .'i.l mm.: liei/^lit, about.'? nun.

One impcrrcct .spcciincu. station KKKJ, X. lat. ;!!)'^ .^)(J', W. lon^-. (>!•'
'ir.', in :U\) latboms, issi'.

Tiii.s species is reiuaikable for tiie piainiu'ss ol' its surface, aud the
simplicity ol' its liini;(', as it lias ueitlier radial undulations luu' tooth-
like ])roJe(!tious on the liin.i;('niar^in. In tbini it ureatly resembles
Arino/isis <>rhicHl((l(i. but lacks the conspicuous concavity in tlu;
anfero dorsal nunj^in. It has. lio\ve\er, a \tM'y obvious ])ostei'i(U' lifi'a-
uuMital furrow in the same relative position as that of other species of

(')\l/l)f(>(l(HI.

A siuj-le valve taken at Ivistport, Maine, ISTli, a<;rees closely with
tlie tyjte in form, but is sonu'wiiat less thin aud hyaline and the beaks
are a tritle more pioniinent. The surface has faint aud rather distant
concentric undulations, visible only under the mieioscope, beiny most
distinct on the umbo. The microscoi)ic sti'iations are a little more dis-
tiiu't ami in some liuiits yive to the surface a librous or finely verndc;-
ulate appeaiam;e when hi.uhly uuiiinilied. This character, however,
has been noticed in other species. The hinye-mar;nin is a liitle nu)r(^
thickened and has a minute swelling' on the inner margin Just beneath
the beak, sc;ircely worthy the name of tooth; the liyanu'ntal .groove is
also somewhat more stronjily nuiiked. This may prove to be a distinct
species more nearly related to A.riiiopsis nrhiciildhi from which it differs
in havinji' the autero-dorsal margin convex instead of stronj;ly concave,
and the <>eneral outliiu' more evenly rounded, and a less evident tooth-
like thickening' of the hin,u'e niarj^in.

Length, about -.S mm.; height, about ll.ti mm.

CRYPTODON (AXINULUS) PYGM^EUS, new species.

(Piiitc i.xxxvi, lijr.s. ;i, 1.)

Shell minute, somewhat compressed, trausverselj'^ ovate, inequi-
lateral, with tiie antei'ior end the long«'r. and with a slightly jn'oduced
])osterior angulation, Suiface scarcely lustrous, covered with line
lines of growth and microscopic striations, ami more or less incrusted
with ferruginous mud, esi)ecially posteriorly; there is barely a trace of
a posterior fold. lJnd)os a little ])romineut, beaks snuill, slightly
raised above the margin, and turned a little forward. The autero-
dorsal margin is nearly straight, or sometimes slightly convex, with a
slightly excavated, snuill, lunular area: the anterior end is broad, con-
vsiderably ]>i'oduced, aud evenly roumled; tlu^ vential nuirgiu is broadly
rounded, not at all ])rodu('ed, and joins the ])osterior margin in a snudl
obtuse angulatifui, above which the dorsal uuirgin is slightly convex
and slojx's rapidly frcun the beaks.

The inner surface is smooth with inconsjucuous muscular scars.

r

\

«.;.*

NO. ino.

i)Ki:i'-\y\rii; )i>)!.i.fsr.\ . vi:i;nii t. i\i> nis/r.

798

ul

'I'lif liiiiy('iniir,i:in in llic ri.ulit Viilvc is sli;ilitl\' tliickciicd witii :i dis
tinct, tooth like jn-omiiu'iict' Itclow niid sli<;litly in tVont of tlie ct'nlci- of
tlic licak. and an inner lold like tliickcniiij: of tlir |iost«'iioi- margin to
NUppoit tiio li.yaiiMMit ; in front of the lunnlar area tiie niar{,^iii is con
vex ami sli};litly cvcitcd.

liCMif^tli, about l.dnini.; lioiuht, about 1.1 mm.

A few live specimens were found at three stations between \. kit. ll'~>
■10', W. Ion,:;. 47 ' 'Ar>' ;U)", ami X. kit. ;}!> :.!' .'.O". \V. k)n':-. 7(i L'O . in
LMM; to 4J»!» fatlioms ISS.'J-l.SSC..

This species is allied to ('. I'cminiiio.sns (l-'oibesi. tVom w liieli it ditVers
in its distinctly produced and aiijjnlated posterior end. and lonj^er or
more produced, ev<'nly rounded anteiinrend. It also has considerable
resemblance in form to (J. iortuosn.s At'Wn'ys, but that has a very lus-
trous surface and more vitreous texture, and moreover entirely lacks
the posterior anj^ulatM)U.

C. suItorahiN of delVreys, scenrs to resend)le lather closely the small
.specimens of this species, but that has more proiiuuent beaks, is
Avedge-shaiicd. the autero-doisal marjiin sloping; pretty rapidly from
the beak, instead of bein;^ nearly straij^ht and horizontal as in our
species.

CRYPTODON (AXINULUSi FERRUGINOSUS (Forbes),
(i'lat.' I. WW II, lius. 7, X.)

Crypiodon ftrriif/iiioniiK \i:i;iai.i,, '1 runs. (Onn. Ai:i(l.. V, ]>. ."iTd. |ssl': ^ I. \>. -~\\
ISSl ; Mxpl. .Ilhiihii-^K, K'r|)cirt I'. S. (Jniii. l'i>li iiiid I'islii lies lni iss:;, ]i.r>7ri,
l.ss."").— D.U.I., I'.iill. r. S. N'Mt. Mils., \(). :!7. ]). ."id. iss!t.

AsiniiH firrinjindxtis l.oc.vun, ('.niipiiiinf dii ('midaii, .\iiii;ili's dc niiiNcisiti ilc
L.voii. i>. tin, Isik;.

This very connnou species was found at numerous stations from N.
lat. 4L'^ 47'. W. lon,y. (11 01', to N. lat. •T)'^ IL" 10". W. Ion-;'. 71 -^ ~u' 1.5",
in Vlbh to ],r>2,"i fathoms, 18S0-18S0.

CRYPTODON (AXINULUSi OVATUS, new species.
(I'latt's \C[. li-;-. 7; .\C1II. li;;. 1.)

Shell small, ovate, not swollen, with the jxisterioi' end ]U'odnced and
somewhat i)oiuted, rusty bi'own in color and heavily inciiisted with
iron oxide. (Tmbos rather llatteued: beaks small and concealed by the
coating" of fei'ru<;im)ns matter. Tlu- anterior end is well rounded with
a nearly semicii'imlar curve; the ventral marj^in is broadl.\ convex;
the posteiior margin is tapered and i)ro(luced at tlu^ end, with the
dorsal margin a little convex and sloping rai)idly. The hinge-margin
is a little thickeiM'd ami nnudi obscureil by the incrustation. In the
left valve there is a rather i)romiuent. blunt, tooth like swelling below
the luuular area; in the right valve there is a corresi)oiiding uolcli
{lud a rathei- Avide ligauu-ntal furrow commencing beneath the beak,
and running back subi)arallel with the dorsal margin, becoming more

i^ll

, JagSBI.; ,-A,

71)4

ri!nri:i:iti\(:si or the \trio\u. mi si:i m.

vol.. XX.

iiitoniiil i»ost«'i'i(»rly. .Inst l>en«';itli Mic beak is an clonjiati'fl tootli-likii
tliicki'iiiii^i of tlic iniMT iiiar;;iii wliicli <'(His«M|ii('iitly ciirvt's downward
at. this poinl. Muscular scars uliitisli. iiicoiis|iicu(His. The external
surface, so I'ar as visible, seeius to be smootliish with irrej^uhir lines of
growth.

Len^Mli. l.(i mill.: hci^^ht. I.I nun.

Tw«) valves, slal ion iM!), N. hit. 40" :5', W. lonj;. 7(P;M '. in l(t(» fathoms,
l.SSl. This species is encrusted very niiicli us ('rii/>t<)<li)ii ( A.riiniliis)
J'rrriijiiHnsiis, iuit is (piite different in its niiich more st roiiuly de\ clopetl
hiiijie and ovate form.

From station LMl.!. N. hi\ . A'i >]>{)'[)[)" , \V. lonj-. To" l!>', in l."> tatlioins,
there ai'e tlirei^ specimens (No. ',i~)'>'M ) of coiisideralily larger si/.e which
agree (doselx with this si»eeies and are i)rol)al»ly identical, 'i'hey are
more extensively enciiisted with ferrngiiious miid and are somewhat
higher in ]>roportion to their leiii;th; the \entral margin being slight ly
produced in the middle, but they have the same posterior angulation
and the same evenly produced anterior end. The beaks are larger,
rounded, and relatividy more ])romiiient above the margin. The hinge-
margin is very thill and delicate, but does not ditVer essentially in other
resjiects fr(>m the smaller s|iecimeiis.

Length, 2.(» mm.; height, L'.- mm.

AXINOPSIS ORBICULATA G. O. Sars, variety INEQUALIS, new.

(I'lati- XCII. li^s. r>. t;. >

.t-iiiiojish orhiciilatit (i, (>. Saks, Molliiscii \U'<i. Arctic'r Niirveijin', ]). tiH, ))1. !!•,
Ii;;.s. !!((-(/, 1S7S. — N'KlJIiiLl,, 'rr.iiis. Conn. Ai-iiil.. \', p. .".(Ill, I.SS2.— liusil,
J'roc. r. S. \!it. Mus.. \l, i>. LM;!, 1.1. i\. li,-. I. ISSIt.

The inuiKMous speeimens of this species show considerable \iiriation
in form and character of the hinge. Many speeimens show the eardi-
nal tooth and jiit as described and lignred by (i. O. Sars; others have
the hinge niargiii nearly smooth or with mere rudiments of a tooth and
jiit. Our speciiiK IIS uioreover show a thin, eontiiiiious external liga-
ment, which should be lacking according to Sars' description, but he may
have overlooked it. In form many of our specimens are evenly rounded,
as figured by .Sars, but others have the antero-dorsal margin more con-
cave and the anterior end somewliat ])rodiiced, while the i)ostero dorsal
margin is somewhat straighter than usual.

Speeimens from tlie JJay of Fundy have a somewhat oblong form,
with the ventral margin more nearly straight or but slightly convex,
and with the anterior end distinctly ])ro(luced. This ionn seems sulli
(Mently distinct to receive a varietal name, and \ve therefore propose to
call it variety htequaiis.

1

I

Nl>. 1131).

l)i:i:i'\y.{Ti:i; .M<>LLis<\{-n:i;i;ii.i. .i.v// /;/>//.

TK')

1

1
I

AXINOPSIS CORDATA, new species.
f IMiitf \('\'II. Iii;s. .-.. (1. 1

Slu'll .srii:ill. wliitc. Hiimolliisli, ruiiiidrd ur soiiu'wliitl I'oidjilt". lni,L;cr
anteriorly, witli small, Iitll«i laoniincnt Itraksciirviiij; lurwaKl. Antcitt-
dorsal margin a iittU> coiivcx. slopiiij; <iiadually and itassinj-' sonii'wliat
alii'iiptly into tiic antrrior nnir^iin. wliiili is Inoadly and oldnscly
ronndcd: vnitial nnnjiin stronjrly <(»n\ ex, sonicw inil produced inlln>
ndddle; p(»sterior niariiin pretty «'venly rounded, exej^pt in tiie middle,
wliert' there is a sli;.;ldly produced piulion eorrespondin^' to tlie jdiea-
tioa; |>(>stero(l()rsal niar;;in stronj-iy eon\e\ in llie middle. 'I'lie snr
faet! is marked by line, mieroseopie, eoneentrie, stria' and irrej^nlar lines
ot" };r()\vtli whieli, on the lunbo. appear as slij^ht undnlations. The li;;a-
inental area is rehitively larue. pioniinent in the middle, ami delined l»y
a distinct j;i'(K)ve, beyond which there is a well marked but low radiat
iiij; ridji'e or ])lieation which Ibrms iin inconspieiKtus ])rojocti<ni at the
inarj^in; anterior lo this there is a veiy sli;;lit wa\elike depression of
the Burlaee, nnicli as in most s])Ovk's ol Cniiihuldii. The hinjic niarj;in
is decideilly thick«'ne(l; in both valves there is a rather larjic. obtuse
tooth ,).ust l)el(tw the beak, troin which it is separated by a rather larf^e
space for the li^'iiment which runs bacdiward for a short distam-e in a
(;()Us])icuoussnbmarginaI ^rooNc, Ix-conun;;' intcu'ual distally; anteriorly
the ;;T()()ve is luirrow and outside the marjiin.

liCn^th. about 2 mm.; heijiht, the same.

This species is ret'erred to the {i'cnns A.rinopsi.s with some doubt,
aIth()Ufi,h it has tlje distinct cardinal tooth and lijianu'iit j^i'oove. It
has, however, a sinjile posterior plication sindlar to that seen in some
species of Cri/pttxiou: but the character of the ])lications vary in that
genus, in some cases being very strong and in others obsolete, or nearly
so. In fact, the jicnus A.rinopsi.s can hardly be distin;.;uished from it
except by the distinctly developed cardinal tooth, which is only ])ar-
tially ditferen tinted frcnn the juoximal end of the anterior hinge-plate.

A few separate valves and two live young were found at six stations
between N. hit. 40°, W. long. 71 ' 11' -M)", and X. hit. .'{5° 41", W. long.
740 54' -M)", in 4;i to LM)2 fathoms, 1,SS0-1SS4.

The young siiecimens from stations S7<> and *M'-> are referred to this
.'-])ecies with considerable doubt, as they have a nuudi more rounded
outline, although the hinge-margin is similar.

AXINODON, Ile^^^ genus.

Type. — A.rinodon cllip/iciis, new sjiecies.

Shell thin, rounde<l or ovate, witlnnit jdicalions. Hinge with one or
two small or subnidimentary teeth. Ligament internymphal, poste-
riorly so far internal that its inner end, distally, is attaclied Itelow the
iuuer edge of the hinge-plate, and therefore covers its entire breadth.

«

i

71i() rnnci.ritiMis (H'dii: s \ iio^M misiim. m.l.xx.

AXINODON KLMPTICUS, new species.
(I'liilrrt XC, liuH. .".. tl: .\<ll. li^'. 1.)

SIm'II siiiiill. iM'iii'ly siMiMitli. s\\oIl«'ii. (riiiisvcrscly clliitticiil and soiiio-
wliiit <iI)|mii<;', witli iMllitr protninciit iiiiilxis iiiid with tli<> IxmKh con-
.sidciiihly iM'lihiil tlic iiii(l<ll<' iiiid ciiiNfil loiwiird. 'i'lir iiidrro doisiil
iiiiUffiii is d»'rid('dly foiiv ('\ iiiMl sdiiicwliut cNnirxi'd. tlir aiilii'ior «'iid
is loiijicr and ;i lit 1 If I decider lliaii t lie pusinioi; hot li arc nearly evenly
r(Mind<-(l; t lie ventral inar;.>'in is in-oadlv rniinded and nearly straiuht
litr a short distance a l(»n;4 1 1 K' middle; I he |M»>t( ro doisa! luar^rin !>* •'<>ii-
\('\ and Mii'rjii's into the posterior end in a re;;iilar enrve. The Innular
area is rather distinct, but without any very delinite ixmndaiy. 'l\\v.
snrl'acc is nearly snioctlli, cuvcred only with line, (d(»>e lines ol' <;rowtli.
which, nnder the nneroscoitc. appear as delicate, laised lines, separated
by jirooves ol ahont the same width; this sculpture is \ cry leynlar
ovei' most ol' the siirlac*', but on ihe nmbos sonn' ol' the rid;;es are so
lar,i;»' as to appear like small nndnlations. The interior surface is
smooth and white: the mi iscidar scars are indistinct ; the liinu*' niar<;in is
rather thin ; the jxislerior liyaineiit is piomiiient. wed<>-e shapeil. widest
<listally. and occupies ii distinct groove covering the whole breadth
and exteiidinji about oiM' third the iciiiith ol' the jiostcro doisal maij^in
and rnnninj' forward undi'r tlie Ix'aks. In the left valve there are two
slijuhtly raised, iniiiiitc. obscure. I'ouiidid teeth under the beak, of whicli
the anterior is a little more distinct than the other: farther forward,
aiul separated from (he latter by a slight notch, there is an elongated
tliickeninj; of the niaiuin foriniujn' •• '^*»'t of lateial tooth or lamina and
separated from the outer edj^e by a narrow j^Toove. In the li.uht \ alvo
the anlcrioi' tooth-like t hickeiiinji' is less distinct and there is only a
very slight rounded swellin;;' of the lunular margin under the beak.

Lenyth, ."..."• mm.: heijiht, .'J mm.

Tw( live specimens (No. .T)!;.".), staticui L'O'.Mi, N. lat. .".JP 22' 20", W.
lon^^ 70 ' ."ii" 20", in 1,^51 liuhoms, JSS.'i.

LEPTAXIN US. new genus.

Tjipr. — L('i)ta.viuttH )n ill Kills, new s])ecies.

SIh'II small, short ov;ite, iiuMpiilateral. with the anterior eiul tlie
lonjicr. and rouiid<'d, and the ])Ostei'i(U' end tapered and anj;ulated,
with a sli«>ht jtlication. Jlinge-plate well <leveloj>ed, with a delicate,
lateral tooth on both sides of the beak in the rij;lit valve. an<l one ])0s-
terior lateral tooth in the left valve; in both valves with the ju'oxiinal
end of the hinjie-i)lat(; eiilarj;'ed and thickened near the beak, that of
the left valve most d«'\ eloped and risiiiji- into a blunt tooth-like ]>romi
nen<!e. Ijij;ament commenciuji" under the beak and runninj'' back (Ui
the ventral side of the i)osterior hin<^e-i)late, so that lor the greater
l)art of its length it is internal.

i

TT

N>>, llittl.

hi.i:i'-\\ A I i.i; Moi.i.i .SI .1 \ i.nuiLi. .i.s/* /./>//

:>7

Tin's <;onn.>< difVcrs \'v()\\\ Cti/ntinlnii in the UhM'v iiiicrii;il |Misjtioii of
tlic li<;:iiiM'lit iiimI in Inisiiii; liistiiict hitciiil tit-lli. I'min A.iiinnlnn. in
tli4> sit'ori*;*-) liin<>'c pliitc, in tin* inrsciici- ol' I he liit<'i:il tn>i \\. in iia\ in;;
:i postcrioi- pliiMtinn. :ni(l in liirlvinu disi in<-i (Mriiin;il hcili.

LKPTAXINUS MINUTUS, new spucics.

(I'lair i,,\\\i\. tin-. ;;-:..)

Slirll niiniitf, lii(i;i(lly <»\ ;iU', witii ii sli^iitly |tiiHhnc(i t»l»tnsc jioint
near the inidilN- nl' llic pnstciioi' cnil. and a soincwiiiir piiMliicrd,
Itroadiv iniindcd aiih'iior end. licaks Itfiiinii tin- iiiiddlf. I'isiii;^' ;i liitl*'
alM)\ <• tlic dnisal inar;;in and tniiicd tnrw aid, Ira\in;;' a sniali. lat licr
dcfp lunnlar area. Aiilt-ru ddisal inari;iii a liltlc ('(iiivcx. slupin^i' Ixit
little; aiilci'ioi inar.uiii I) oadiv and cv riily roiiiidtMl, tunniii;; nearly a
scinicirt-'lc, and passing;- ('ontiniioiisly into llic xt'iitial inariiin, wincli
is a little iiioic liniadly roundiMl ; the ijosfcrioi' inai uiii is suiiifwiial
an;;idar, w it li a distinct iiroininencc a little liclow t lie middle, wlieii^
tlio radial lidjie teiininates, lielow this tor a slant space llie mar-
\*\\\ is neail.N stiaiulit or sli^^litly iiiciir\-ed: al»o\c. the ]»ostei<> dorsal
iiiarjiin is sti'ai,i;lit as far as a sli;;lit annie in the liuanieiital aiea.aliove
which it iscon\e\ totliebcak. 'I'lie hiii;;*' niaij^in is a little thickened.
and in the left \alve I'oiiik a lathei- ]iidiiiineiir and soinewhat aii;;iilar
to(»tli Just below and sli^ihtly in IVont of the lieak ; the liya mental <;ioo\ e
is haroly visible on the inner face of the posteiictr hiii^c inariiiii, and
runs t'orward as a narrow <jroo\e beneath the beak: in the i't;ht \al\e
there is a somewhat less prominent tooth Just under the lieak. liehind
which the lijiiMueiital .i:roo\e forms a distinct iiotcli in the iiiar^^in.
I'nder the micioscope tiiere is seen in both \al\es a distiiicr sid»iiiar;;i-
iial ri(l;4(^ with a conspicuous yroovt? beliiixl it. c(tminenci!iL; a consider-
able distance behind the l»eak and I'lninin;;' in and alony' the inner
hiiijiejiiarjiin : there is also in the ri^ht \'alve a short, indistinct groove
along the end of t he hinue-iiiaryiii in front of the beak. I".\lciiially a
rather shallow, depressed undulation runs from the licak to tiiepos-
tero-ventral mar.iiin; Ixdiind it is a nai'row. l»iit slightly prominent,
I'adial rid.uc running;' to the jiosterior auiile: back of or alio\-e this a
lather slioit lijiamental area projects beyond the marjiiin. 'I'iie snrface
is covered with a t hin, <;r(*enish yell<»w epidermis and is marked i)y
liiu", ]»retty i-ejiular. parallel, raised lines of Liiowth. and also lainl and
rather numerous radiatiiiu lines which are not \isii)le except under a
hi Jill power.

Lenj;th, nearly 1- mm.; height, 1 'i' mm.

One live specimen ( No. l;">(I.St>j, station UIK, N. lat. 40 '.V , W. Ion;;. 7( *
.■Jl', in KM) fathcuns, 1881.

71)8

rnocEi'.hiM.s iiF Tin: y.moy.iL .i/tn/.tu.

Vnl.. \X.

Fjiinily ASTAIMM DJO.

ASTARTP^ NANA (Jeffreys?) Dall.

Antinlr ntuiit Kai.i.. Hull. Miis. ('iiiiii>. /(x'll., \II. ]>. Jill, \A. \ii, lius. (i<(, (i/;, Is.st;;
Hull. r. S. Nil!:. Mils., No. :{7, i). Iti, jil. \ ii, li<rs. i\», tl//, 188!t.

A siri,i;lo valve, wliicli ii}j;n'es pt'i'l'ectly with Dall's lij^iires, (|iiotc(l
above, was Ibmid at station L'."«07, olf Cape Ilatteias, Xoi'tli ( "arolina,
in 43 I'athonis, 18S4. South to Sombiero. in L'2 to I'.KJ fathoms. — Dall.

Family (U\S1MI)ARIILE.

In the classification of tliis fainilv wc have adopted the groups pro-
posed by JNIessrs. \V. 11. Dall and M. A. Smith as dclined by Mr. Dall.'

We, howevei', consider his two siib,i;'eneric groups, Vardiowija and
Jlalonymplia, as distinct jicnera.

CUSPIDARIA UNDATA Verrill.
(I'hitos I.XXIl, lin, 1; LXXVIIl, ligs. :{, 1.)

Xciira uiidaiii \i:i{iai.r,, 'rrims. Cnmi. Acml., VI, ]>\). L'L'.'i, 217, 1S81; Expl. .Hha-
irox.s, tvi'port, r, S. Com. I'inIi and I'islu^i'ics fur ISS;!, p. 'u\, 1XS'>.

Not MjioiHiii iiudatii Dam,, 1*>iiI1. :Miih. Coiiii). Zoni., XII, pp. ^02, 'M\. isHti; Hull.
U. S. Nat. Mils., No. ;37, p. fiS, lSS!t (in i)art).

Three live s))ecimens and two valves wcie found at stations LMIDS and
2r»(>(J, oil' Chesapeake Uay, in LM'L'I and 'l,i\^{) fathoms, 188.'! and 1S8.").

Frafjnients obtained by the lllalc near Havana, Dominica, and St.
A'incent, in ir>() to (111 fathoms, are erj'oneously referred by Mr. Dall to
this species. Our shell is certain!^' n(»t a Mnontrn.

We have a fragment of a left valve from station L*(;5a, N. lat. "21^ 2'J',
W. long. 78" 7' 30", in 338 fathoms, found among l"'oraniinifera, which
belongs to a strongly undulated species, with a, short, angular, sub-
a(;nte rostrum deliiUMl below by a rather deep groove at which the
concentric sculpture changes abruptly. The beak is i)rominent and
turns strongly backward. Tln^ cartilage-plate is strong, deeply eon-
cave, and directed backwar<l; a moderately elevated internal rib runs
backward from the umbonal region [o the posterior uiuscular scar.
The shell is thin and has deep internal grooves corres])onding to tlu^
extei'iial ridges. Judging by the lines ot' growth, the shell was short-
ovate, broadly rounded anteriorly, and having posteriorly a siu)rt,
angular, subacute rostrum; tlu^ escutcheon is concave and well-<l(?(in(ul
by a small, sharp ridge. This fragnu-nt seems to belong to an unde-
scribed s{)ecies of Mjionern. It can, however, hardly be the sann* as
Mr. DalPs species, as he states tluit in his "there is no buttress or
ai ;*earance of an internal rib.*'

Bull. Mils, Coiiip. Zo.ll,, Xir. p. 2!)2, ISSfi; XVIIT, p. Ill, J889.

I

NO. 1139. i)i:i:i'-i\'.rn:i! i/o/./, r>r./- 17; /,7.7/./, .ixn 1:1 s/f. 7119

CUSPIDARIA LAMKLLOSA iM. Sars i Dall.
O'l.itc lAXIV, lii;. 10.)

.\ '<■(()•(/ hiiiiclhiad \i;i;i;il.i.. I'r.ins. Coiiii. Acuil., \', \i. ."idl, ISM'; \ 1, p. ■J~~, pi. x\ \,
liii. '■'>, ISSI; lOxpl. Alhatiosn, Ii'eport l'. 8. ('lUii. I'i^li mid I isluiio loi is.s::,
p. 571, iss:..

('ii>ij)i<liiriii Uihifllimi l>.\i,l,, I'.iill. Mils. Cump. /.(xU., XII, p. L'!U, ISMl; Uiill. U.S.
N:it. Mus., No. ;{?. II. (■>(!, 111. \l.\ , liu. :5, ISS!t.

Coniparativi'ly tew speciiutMis. at twelve .stations, l)et\v('eii X. hit. 4<i
L" li>", W. loiij,'. OS' ]!)', and N. lat. .'57 ' M' ;j(>", W. Ion-. T.'. IS' 10 ',
in ;n!» to ."i.M fathoms, ISSO-ISSO.

A lew specimens occiiiii'd whicii (lilVei' from tlie typical loiin in liav
ing Imt live or si.K eoncentrie lamelhe \isil)le on the antcro venli'al
lioition (if each valve and only conspicuous une(puil lines of <;rowth on
the rest of the surface.

CUSPIDARIA TURGIDA, new species.

(I'latcs I,.\XII. Ii^^ 7; L.X.WII. lii;. I.)

Shell rather l'ar<;e, thin, delicate, translucent, of a pinkish white
color within, lon^-oval, with ]>rominent, posteriorly dir<'ctcd umlios, and
narrow, rather lon<i' jiosteriitr rostrum. The beaks arc central, rather
acute and turned distinctly forward. The antcro dorsal marjiin is
slij.litly convex, formiiiii' a l>roa<l curve; the anterior end is a little
])rolonji»'d in the ndddle l)ut otheiwise ju'ctty evenly rounded; the
veidral marj^in forms a rej;ular. broad curve becomiii,u' stroii<j;ly iiicm Vi'tl
at the base of the rostrum; the postci'o (btrsal mar.irin is strai;;lit at
first, l)iit slij;litiy concave alonjn" the rostrum. Tlie cartilaj^e plate is
small and very obli(jue, and in the riulit \ alve, is separated l>y a dis-
tinct notch from tht> lateral tooth, which is long and low, with a
rounded summit ami a long, gradual, posterior slope; there is no trace
of buttress oi- clavicle. In the lett valve the hinge margin is thin, and
nearly simide both anteriorly and posteriorly. The exterior surface is
<!overed with a thin, yellowish gray ei»idermis and is marked with
irregular, rather conspicuous lines of growth ; on the lostrum there is a
distinct diagonal ridge running iVom the b(»aks to the lower margin.

Length, L*L* mm.; heigid, 1- mm.; breadth, 11 nun.; distance Ironi (^eii
ter (d" beak to end of rosti'um, 115 mm. ; to extreme anterior end, IL' mm.

In <brin, general ai>pearanee, and length of rostrum, this s|>eeie.s is
iidermediat«' between (\ iflarinlis and (\ ro.slrata, but the umbos arc
mote obIi(pie and there are obvious diifcrclu;(^s in the hinge.

One live specimen (No. 7S78!)), station L'7U, N. lat. .'58^ 2L", W. long.
TOO 17/ 30/'^ ill i,.S2.j fathoms, 1S8G.

800

ri:(ifi:i:i)i \':s or rni: \.t rn>.\ u. mi sriM.

\ 111 . \ K.

NO. I

CUSPIDAKIA KOSTRATA (Spengler) Dall.

(Thitr l.Wll. li;;. i\.)

Xviiid ronlralit X'Kiiuii.i.. 'rraiis. Coiiii. Aciil., \'. p. "'ti-. |il. i.viii. Ii,;;.;>!', ISSL>; \T,
p. I'TT, ISSJ; l',\|il. AllKilriins. li'cport I'. S. ('(Hii. I'i>li .iiid I'islunics tor ISM!,
1>. 574. l)^sr>. — S.Mrni, I'.. A., K't-port \'o.\ . (IkiIIi micr. '/.ni'A. I,:iiiicllilir,iiiclii,ita,
X!l. i». ;!."). iis^^r..

CimpidHriarostiatu l».\i.i,. I'liill. Miis. (Oinp. /.o<il.. Ml, p. i.".M. Lssil; Will, p. Ill,
18S!t; Hull. IT. S. Nal. Mils.. Xo.liT. p. •!»'.. ISSM.— l.oi .\1!1). Caiiipii.uiitMlii r«(((/r(//,
.\iiMalcs (Ic ITiiivcisiti' (Ic l.yoii. p. 177. \x'M.

Tliis si)e('ic.s was (»l)tiiiiM'(l iit about filtcen stations between N. Int.
40 (i' .")(>", \V. loni;'. 7(1 :'A' I.">", and X. lat. .".s- ;?]'. W. loiiu'. 7:: 21',
ill (m to {'}(> tathoins, Soutli to r)arl»a(los in ('>'> to l.O,')!! latlioiiis. — Dall.

Til

wl

('1<

liol
ca

(Mil

all

CUSPIDARIA uLACIALIS (G. O. Sarsi Dall.
O'laUvs L.WI. lio. H; J. Will. li-. ."- : l.XW . H;;-. !l.)

Xeiini (ihtridlix G. <). .'<Ai;>. .Molliisca Kcii. Arctica' Norvcuia', [). S.'>v. jil. (>, liuH.
8, a-c, 1S7S. — Viatiai-i.. Trans. Coiiii. Acad.. V. ]i. 5(11.', pi. xi.iv. liiis. 10. n-li,
188-'; \\. \). -77, ISSj; I;n].1. Allxtlroy-^. I.V'port I'. S. Cnin.Fisli and i'islicrie.s
for iss;!. ](. .">7I. l.S.^,'.. — Smith, 1',. .v.. i.'c]Kiri NOy. Challciuiiy. '/.n\\\. LaimJli-
liraiiclii.'ita, .Mil, p. 11.'), ls.'-^.">.

Ciiniiidiirid (ilacidlis Paii. I!ii1I. Miis. ( diiip. /uc'd.. .\I1. jip. L'!tl. ;>();!, iSMfl; jinU,
r. S. Nat. Mu . No. :i7. p. (i(i. issn.

Ciispidaria nrctica \ar. <ihi<\iiVin D.si.i,, liiill. Mils. Comp. Zo.;!., .Will. p. Ill,
1889; Vvw. V. S.Nat. Miis., .Ml. j). I'su, issii.

Ciixit'uhvw iiUtrlallH lUsil. Hull. Mils. Coiiip. VauA.. .\.\111. ji. L'l't;. l.s'i:;.

Not Cnxplddyia arlira (M. S\i;>i.

This very coiiunoii spcM'ics was dnMljicd at many stations from X, lat.
41^ L>»;'. W. loiio-. (i-J- 10', to X. lat. .'!7^ n'', \V. Ion.!--. 74 ;!;5', in (il' to Sl'S
t'athoiiis. ►South to the (Jiilt'of Me.\ic«», in 01 to 1,407 lathoius. — Dall.

CUSPIDARIA MEDIA, new species.
(I'latis 1,.\.M. I'ms. .-.. (1; L.X.MII, ^l^^ t!.^

Shell ol' nioderat(> size, rescniblini;- a mediuui sized (\ f/hiridlis (Sai's),
in fonn, but decidedly more swollen, with tiie rostrum nari'ower and
more distinctly delined by a stron_o<'r ventral emarj:ination. I'mbos
lar^e, prominent, and swollen, with stronj^ly iiienrved and very [)romi-
neiit beaks. The aiitero dorsal margin is a little eonve.x; and .slojies
rii]»idl.\' to the evenly rounded anterior md ; the ventral inarj^in is rejiii-
larly curved and is rather more e(»iive.\; than in ('. (ilddali.s. ;ind shows
a vi'iy deei<le(l emarjiination at the l);ise of tlie rostrum; the postero-
dorsal margin is nearly strai.uht but slopes from the beak to tlio end of
the rostrum which is of moderate len.uth and tapers from the base to
the iiari'ow, subtruiicated end; it has no distinct dia,U()nal ridj^e, but is
separated from the body of the shell by a. stronjuly marlced dei)ression.
The surface is nearlv smooth but is covered with lini' lines of orowlh

NO. 1139.

DEKi'-w ATi:n Moi.uscA—vEinni.i. A.\n iiisji.

801

wliicli are most distinct on the rostrum. The liinjjfe inarjjin is thin.
The riyht valve lias a thin, low. much elongated ]M)sterior lateral tooth
which runs nearly parallel with tlu; dorsal margin, .ibove which it luo-
Jects in a hroad curve; tlie eartila<ie-])late is small, very oblique, and
closely united with the tooth from which it is separated by a faint, curved
notch; no liuttress. In the left valve there is no lateral tooth, and the
cartilam' plate is very small, slightly prominent, with a <'urve(l inner
ed.iie. The inner surface of the shell is smooth and the muscular sears
are faint.

Len<;th of au average specimen, K! mm.; height, 8 mm.; breadth, (J.5
mm.; beak to end of lostrum, S..") mm.; bealc to anterior end, <! mm.

This species is allied to <'. (ihtcialis, from which it differs in its more
swollen foiin, moi'e obli(pie anterior end. more prominent ventral m ir-
gin, more clearly delined rostrum, and striiighter postero dorsal margin.
The hinge shows still more declde<l dilferences; the lateral tooth of 'he
latter is stouti-r, more prominent, and less jn'olonged; the cartilage-
plate is smaller and less distinctly deline<l. From C.fraterna it dilVers
in being less ])rodnced ventrally and in having a longer rostrum with
much straighter dorsal margin and a m;;..ii longer lateral tooth.

This is a cctmmon species olf Marthas Vineyard and has been taken
at about tifteen stations between X, hit. KP 10' 15''. W. long. 70^ I'l;',
and N. hit. a!)^ ">(;'. \V. long. 70^ 51' IS", in 03 to 155 fathoms. 188(>-1,SS4.
A Itroken valve, station ;u;2, X. hit, 12^ 1', W. long. (IK"^ 31', in 10(5
latlioms, 1870, is also referred to this species.

CUSPIDARIA PARVA. new species.

(I'liU.s L.WIV. lin. !): UXWII. lijr. 7.)

Shell small, (ieli(;ate, elongated, inei|uivalved, having a general resem-
blance in form to tin* very young of ('. ohcsn and (\ frntcrna. I'mbos
small, ratliei' prominent; beaks similland incurved. The ant«'ro dorsal
niaigin is moderately t'onvexand slopes regularly to the e\'enly rounded
anterior end; ventral margin very broadly rounded, with a decided
incurvature at the base of the rostrum, corresponding to the marked
dei»ression of the surface; posterodorsal margin slo[)es ra[»idly at
tirst and is usually concave along the rostrum, which is modt'rately
long (the length Naiies in dilferent specimens), narrow, with an obtusely
rounded or subtruiu-ated end. It is crossed by a distinct diagonal
lidge, above which there are several small, raised, ra<lial liiu's; the
surfaite is elsewhere nearly smooth or presents a micr()scoi»ic, faintly
granulose a))pearance. The left valvt; is the larger and considerably
overlai)s the right along the ^'entral margin ami siphonul region; the
right overlaps the left along the jxistero (husal margin; the rostrum
is a little bent toward the left in some specimens. The hinge-margin is
delicate, with the anterior margin a little everted; <'artilage i)late
minute, sunken, in the right valve well separated from the i»rominent,
l*roc. N. M. vol. XX 51

802

rnnciJEDTXas of tui: x.iTrnx.iL museum.

VOL. XX.

rather olonj^atod liitcral tootli ; tlie left viilvc also liiis a small, clonjiatod,
tootli-liki! e\i)iiiision posterior to the eartilaj^e plate.

Len,utli, l.."» iiiMi.; liei.uht, LM'.") iiiiii.; breadth, l..~) imii.

Tliis species may easily be mistalcen for the yoini.y of (J. <>hrs(( and C.
ffdtcnid; the .structure of the hiiiye is, ho\v<'ver. eliaracteiistic.

A eomparatively few specimens, at seven station, between N. hit.
41° 2S' 30", W. lon<;-. (m^ 35' 30", and 350 .j((/ ;;()//^ W. haiy. 71- 31' 45",
in 515 to 1,200 fathoms, 1S83-18S(>.

CUSPIDARIA VENTRICOSA. new species.

(Plates L.WII, live. ■'■■ i.XXVI. ti.>r. (i.)

Shell lar.n(>, rather solid, swollen, with a \«'ntral enlarjicment and a
moderately elon,iiated, tajjered rostrum. Umbos swollen and promi-
nent; beaks incurved. Antero-dorsal maryiii at lirst nearly str a ij;ht,
then broadly rounded with the extreme anterior end a little prominent;
ventral niarjiin decidedly exeurved in the middle, corresponding to the
exterior swellini;'; at the base of the rostrum sliiihtly concave; ]iostero-
dorsal marj^in somewhat concave, the most so at the base of the ros-
trum, which is obtusely ronnded at th(> eiul. Exterior covered Avith very
distinct lines of growth and irri'yular, stronger, concentric jii'ooves.
C : the ]'ostrum there is an obtuse, diaj^onal rid<;e running to the ven-
tr.'. auj^le of the tip; between this and (luMlorsal maryiii there are two
otheis less distinct. Tin; ant<'rior hin^e iMaij.;in is decidedly thickened
in both valves and ])rojects inward with a thick, rounded edj^e, most
eon.spicuous in the iij;ht valve, in whicii it is abru])tly much narrowed
near the cartilage-plate; in this valve t]ie lateral tooth is short, stour,
obtuse, very ])ronunent. and situated close to the beak, its length along
the margin not inuch exceeding its height; cartilage-plate small, rela-
tively wide, obliipie, directed backwanl and downward, and closely
united to the lateral tooth, there being only a slight, i-ountled notch
between.

Length of the larger s])ecimen, 30 mm.; height. L'9 mm.; brea<lth,18
mm.; beak to end of rostrum. 10 mm.; beak to anterior end, 17 mm.
Another specimen is '25 mm. long; 17 mm. high; lU mm. broad.

Four valves, at three station, between N. hit. 10"^ L'O', W. long. (iO^ 1',
and N. hit. 38° 21' 30", W. long. 70° 51' 30", in 340 to 1,700 fathoms,
188L*-188().

This si)ecies has some resemblance to C. (il<(ci<(lis,hut\s a stouter and
liKH'e swollen shell, with a relatively larger rostrnm, much more elon-
gated and less prt)minent lateral tooth, and very different cartilage-
plate. The latter does not have, the swollen ventral region, character-
istic of our speciesj nor the diagonal ril)s on the rostrum.

NO. IKiO.

DEKr-WATKU Mor.Lrsf'A—vEHRir.L jxi) insn.

803

CUSPIDARIA ARCTICA (M. Sars) Dall.

(I'lalcs I.XXI, li-. L'; I, WIN', li;r. 7.)

\((rr(i iirctica Sahs, (i. <>.. MolluMCii R<(^. Anti(;i' NOrvoj^i:!', p. sr>, |il. C. tlrs. 5,
(t-c, l!^78.— S.-Ninir, K. A., K'r])(irt X'oy. CludUiiiicr, /.ik;!. I.;unclli1>r;nicliiatii,

XIII, !>. :;.-., iHsf).

('uspidiiiiii (irrli((t. D.vi.i., Hull. .Mii>. Coiiiip. /.'>"'•, XII. p. -i'l, iNSii.
\i)t Xciira Hrclicd \ i,i;i;iM. Aiiht. .luiirii. .'<imi'M( c, \I. ]i. ltd, |s7;i.

A siii.iilc inii»erl('ft Viil\e IVdiii station 7(», soutli of llaliliix, Xova
Scotia, ill V.Hi fatlioiiKs, is i'el'<Ti'('(l to this sju'cics. Tliou,iiii worn and
slijilitly broken, it a<ire('S(;loSL']y witli Sars' li<;iir(', Itiit it cannot be lully
grown, for it nieiisiires l)nt II mm. in lcn<;tli and II mm. in height.

CUSPIDARIA l-^ORMOSA, new species.
(I'lalfs I.\XI\-, liu-. (5; 1,.\.\1.\. lit;. ;i.)

Slicll short, high, and swdlleii. I'mbos piomincnt; boaics incurved.
Anterior ]toition broadly ronn(hMi. a little produced at tiie end, with the
dorsal maigin conxcx and a little excurved; the vi-ntral margin is
broadly and evenly rounded ; the rostrum is short, bioad at base, much
ta])ered; the ])ostero (b)rsal margin is nearly stiaiglit at lirst, then
slightly concavii and a little u]»turned. The exterior is covered with
uneven lines of gi'owth hetween which the surface is nucroscopically
striated and more or less iridescent. The color of the single specimen
is pale pink, externally and intermilly. The light Nahc has a promi-
nent, triangular lateral tooth with its base prolonged parallel to the
margin of the shell ; it isseparate(l by a decided notch from the cartilage-
plate, which is of moderate size, ovate, somewhat obliipu', with its inner
edge rounded and prominent.

Length, aV)ont ]() mm.: height, 1.! mm.: breadth, l(»mm.; beak to end
of rostrum, about '.> mm.: beak to anterior end, 8 mm.

A single, much broken, specimen (No. 7S;>ll>). station L'TOfJ, N. hit. IP
28', \V. long. (».")' ;>,■)'. in 1,188 fathoms, 188(1.

( 1

CUSPIDARIA FRATERNA, new species.
(IMiitc^ I.XXI. lius. 7. S; l.XXW iij;. <'.^

Shell similar to ('iisjtidKria obaui (liovt'iij, moderately large, consider-
ably swollen, rather tiiick and lirm for the genus, with a moderately
long, tapered rostrum. The umbos are jather prominent and swollen,
with the strongly incurved beaks nearly in contact. The anterior end
is broadly rounded with a regularly curved. coii\('\ dorsal ('A\xi' which
rises nearly to the height of the umbos; tiie ventral margin is a little
protuberant. 'J'he i)ostero-dorsal line slopes with a slightly concave
ontliiu^ to the end of the rostrum ; on the \ entral margin there is a (lis-
tiuct incurvature corresponding to a wave-like depression on the surface,

804

rRnrr-rnixcs or rni: s \rinx.\r. visff^f.

vol, XX.

(U'liiiiiin tlif Icisc of the lost luiii. The siiirjicc is iicafly siiioot li and
sdiiicwliiil flossy. coNrnMl with line liin-s ol" ••tow th w hicli hccdiiic iiiuri'
proiiiiiiciil and iri«',i:uhii' on (he lostruni. which lias no distinct diauonal
line. The liini-c niaij^-in is somewhat thickened: thi! iii;lit \al\'e lias ii
I'at her short, prominent, ohtnse, friiui.ynlar lateral tooth only slij^htly
se])Jirated from tiic <'art ilajic-iihite by a concave margin: tlie cartilaj^e-
plati' is snnili. \ ciy oidi(|ne, with the innci' ediic curved and not at all
nn.iinlated. Muscular scars and pallial line indistinct ; no buttress.

I>en<ith, !."> mm.: height, !* mm. : breadth. «I inm. : from beak to end
of rostiiim. S mm.; from beak to anterior end. 7 nun.

l'"onnd at about thirty stations between N. hit. 10 i" 4!»", W. lonjj^.
dS" 1!»', and X. lat. .".T L'.".'. W. Ion-'. T.T' XV. in AU'J to US I fatlionis.

This species rescnd)les ('. ulnsK (Lovt'-n) in form; it is, however, a
larj^er species with a liiiuerand more swollen shell: the ventral uuiriiiu
is more prominent, so that it has a relatively hi,iiher form and is broader
at the base of the rostrum, 'i'he liiii.ue shows more decide<l dil1'ereiu*es,
for in ('. oJicsd the lateral tooth is smallei', shorter, and closely approxi-
mated to the cartilage plate which is distinctly an^iilated. the inner
end licin.o- acute and separated from the tooth i)y a small angular
notch.

CUSPIDARIA OBESA Lovf Dall.

(I'l;itr i.XW. li.i;. 7.)

h

Xciira olivxa I.oxi'n, lud. Moll. Sciuitl. Occitl., ji. IS, 1S16. — \'kui!Ii.i,, 'I'nniH.
Coini. Ai:ni.. N, p. ;".(;;{, ]i I. \ [,i\ , li^, Idc, 1SS2: ^■l. ]>. L'TT. I.SSI (iiiiiMit): llx].!.
.Ilhfitruxx, K'l'porl 1'. S. Coin. I'isli iiiid l-'isiicrics fof 1SS;{, |). "iTI, ISS") (in
part). — SMrrn, K. A., i>fiiort \'o> . Chdlldnji r, '/ah'A. Laiiiclliljiaiii'liiata. XIII,

]). r.i, \xs:>.

Ciixpidiirid (till sti \K\l.l.. ISiill. .Mus. (diiip. /oiil.. \1I, p. !.';».">( not pi. Ill, fig. 1 ),

is8(i: Hull. I'. S. Nat. .Mu.s., No. ;>", )>. (IC (not pi, iii. W'^. 1), ISMl.
Not Xt'ii rti iivlliicidd SriMl'soN.

This species has been found at about twenty-four stations between N.
lat. 4;P2;}', W. louo-,(;8 ;?()', and N. lat. .{o IL" 10", W. long. TPoT'l.V,
in !M;to.Sll fathoms, 1S7;5-1SS7.

it is recorded by ^Mr. Dall from off Barbados in 1(10 fathoms and off
tlu! coast of Calitbrnia in 1(! fathoms.

After a ci'reful stmly ami (Munparison ot" the numerous species
belonomg to the family Cuspidarida- mc have been able to satisfac-
torily prove that the form des(;ribed by Stimj)son as Xcant jtvUiiciiUi is
<|uite distinct from that described by Loven as ^V. obcua, with which it
has been so lono- confounded.

If

No. ii:m

ui:i:i'-n.\ri:i! Moi.i.rsc.i—vF.inui.i. .i\n i:i sn.

SO."

XIII,

c. 1),

,

CUSPIDARIA PELLUCIDA (Stimpson).
n'li.trs l,.\w. I'm-, s: i.xwi. liii. s.i
Xtirni pcnnciilii SiiMi'SDS. Imcrt. <iImii(1 M:iii;m. ]>. 'Jl. jil. i. ti;;;. i;;, ]sy.',. —

(iol'I.K, Iint'lt. Mas>;;i(liiisct Is il'il cd. 1, p. (il. \\\x. '.'>~S, IS7t>,--\'i:i;K(|,l.,

Clieck-list, 11. L'l, IMIi.
.V((;)(( sp. \'i:i;l!il,l.. l"-\|il. .Illiiilrnsn, K'rpoil I'.S. ('diii. I'Kli Mini I'i^lnrics lor

iss:;, p. r.Tl. iss:,.

Not .\V(M(/ ohrmi L()\ I's'.

Shell small, imicli s\V(»llt'ii, witli a strongly taiM-rcd. soiiicw lial pro
(liK't'd rostnini. I'liiltos iclatixcly laij^c ami proiuiiiciil. licalxs iiiiniitc,
stroiijily incurved, 'i'lie anterior port ion is lo'oadly and evenly loiinded,
tlic iiiai\uin lorinin;;' lu'arly a seniieirele. w itii the dorsal margin utronj^ly
eoiivex and cxenrved, risinu' nearly as hi^h as the und)()s: tlic ventral
iiiar.uin is lu'oadly rounded i»iit distinctly incurved at the base of I In-
rostrum which is rather inurow distally, obtusely lounded at thetiii
and slightly uptuiiuMl: the posteri* dorsal iiiai<iin slopes considerably,
is nearly straiju'ht at. lirst but becomes slight ly couca\('on the rostrum.
l"'xternal surface uearlx' smooth but usually showin^u' more or less prom-
iiH'ut lines ot' orowth, most distinct on the distal part of the rostrum
which is destitute of il distinct dia,L:()nal line. The ri,L;ht \ alve has a
short, ver,\' ])rominent. stioii^ly curved lateral tootli risiui; close to the
beak, the most prominent part Iteing' near the proximal end wliicli rises
rather al>ruptly IVoui the very minute cartilaj^e jdate from which it is
not separated by a notch; Just in front of the beak, the hinjic-marj^iii
is distinctly thickened, sinuous, and a little ])rominent. forming a sort
of tooth, separated from the lateral tooth only by the minute sunken
cartila'''e-i)late: the lett valve also has a slight, sinuous tliickeniiig ot
the margin in I'ront of the cartilage ])lale.

Length (d" one of tlii' largest s]»ecimeus, 1.5 mm.; height, ."> mm.:
breadth, .'> mm.; beak to end of rostrum. .'! mm.; beak to anterior end,
2..") mm.

This spe<'ies has been taken at I'astport Harbor; Hay of I''und\-, near
(Irand INlanan Island: ami at about twenty one stations l»et\veen N.
hit. 47^-1(1', W. long. 17 ;;.")';;(►'. an<l N. lat. :\r> ll'i'O , \V. long.
74" nO' 10", in r>2 to .".Kl fathoms, ISdS-ls.Sd.

The specimens here described are from the r»ay of I'un<ly, wo-.n
drand Manan Island and ICastport Ilailtor, very near the locality
where Doctor Stimpson's tyi)es were obtained. In formei' ai tides we
have united this species with C. ohcsd (Lo\(''n). A careful reexani
ination of a large series of sitecimens of both forms has convinced us
that they are distinct but closely related species. In (', ohcsa the
anterior portion is more i)roduced, giving the shell a more ovate out
line; the rostrum is broader and latlier moic upturned; the cartilage-
])late is relativ(dy much larger, moie jtrondnent. and angular at the
edge, and in the right valve is separated from the lateral tooth by iin

8on

ri;i>(j:i:i)i\(is or riir: x.rnox.ir. vrx/v ^r.

It.. \s.

iiii;.;iil;ii' iMttcli; wiiilr tlic toolli itself i.s rt'lutivclv .--iiiiillcr. .slioitcr,
less proiiiiiM'iit. and mort! distinctly ti!;tnyiiliir in Ibi ni,

CUSPIDARIA SUBTORTA fSars).

(I'l.iic.'* L.WIII, li-. 1: l.X.MV, tius. I. :..)

\f<ir(i niihli>rlii i^M;^, (i. i>., ,Miillii>(;i K'ci;. Arctici' \i>r\ o;;iii', ]». ST. ]>]. (i, lius.
(),«-(', 187S. — .Iki KitKvs, Ann. .M:i,u-. Nat. Hist.. ]>. UIM, Soiitcniln'r, ls77: I'lnc.
Zo(>l. Sor.. L()n('<in. ]). !t;i7. XovcnibiT. liSSl. — Smith, E. A.. IJeport ^'oy. (hal-
Ifuijiv, Zoi'il. I.ani(>lli)ii':in('1iiiitii. XI IT, p. )>.">, ISS.".

Shell ino(|iiivalv<', ratlior short, relatively hi<;h. niiich swollen in the
middle, with liiiiiid umbos and a short, tapered, somewhat upturned
rostrum. The anterior ])ortion is broadly lounded, the mar.uin Ibrnnnii'
nearly a semicircle; the antero doisal marji'in is st roii.^ly coiix'cx and
sliji'htly excurved; the ventral margin is e\tMily rounded, except at
the base of the rostrum wlu're it is distinctly incurxcd, especially in
the riiiht \alve5 the ])ostei'o dorsal margin is \'ery strongly conca\e in
the lel't valve an<l less so in the riiilit. The rostrum is sei)araled from
the body of the shell by a sinuous depression and has a ])0(»rly deline(l
diaji'onal ridu'c: it is a lit tie bent to the left and. wheu viewed from al)ove,
ai)i»ears slightly twisted. The surface of the shell is neaily smooth,
but shows distinct liiu's ol* urowtli anteriorly, and especially on the
supei'ior jiart (tf the rostrum; the epidei'mis is very thin, yellowish
white, more or less wrinkled on the rostrum; the hinjie-marjiin is rather
stronji': the lateral tooth in the ri.!.:ht valve is larji'e, rather elon<;ate(l,
rather ])rominent, obtusely triaiijiular. and not .separated from the very
snuill, narrow, obli(iue, sunken cartilage plate by a uotch: in the left
valve there is a small, short, prondneut tooth arising from the ])oste-
rior mariniu of the cartila,n(^-plate and separated from the posteiior
hin^('-mar<iin by a distinct an.iiular uotch.

Len<;tli, S mm.; hei,nht, 0 uim.; breadth, about ~> mm.

One live specimen (No. ."ilT)!.".), station LM!»'.), >;. hit. Iio l(i' .!(> ", VV.
]onj>-. r.l)^ r>.V 4r.", in i;5() fathoms, ISSo.

This species api)ears to be identical with the l'".uro])ean sithinrttt. It
differs from all of our other sjtecies in having a distinct tooth-like
tubercle behind the cartilas't'phite in the lettvahc. Tlu^ inequality
of the valves and the twisted rostrum <ii\e tlu^ shell a ])eculiar aspect.

ik

CARDIOMYA ABYSSICOLA. new species.
(I'latcs I.XXIll. liii. .1: 1,\MV, li;;. 1; LXX\'II, lij;-. H.)

Shell ratluM'lariiC. sw(dl(Mi. with tumid und)os; outline elonji'ate-ovate,
with a uarrow, rather eloii.uated, ta])ered, slightly excurved jjosterior
rostrum, the tips divergent and j;ai)inj;': Mu' anterior end is broadly
round, w ith the dorsal and ventral mar<;ins <'onvex, the latter uarrow-
inji" j«radually posteriorly with a slight sinus at the base of the rostrum ;
the i)08tcro-dorsal margin is concave, so that the end of the rostrum is

If

Nf). IKiO.

iu:nr-ir.nr:n M(>i.rusr.t—it:i!i:n.i. i v/) /;/>//.

807

.sonuMvliiit uptmnrd. 'I'lic eiitiic body <»l' (lie slirll is ('((vcifd \\i(li
iiuiiierons narrow, elovjitctL radiatin;;' ribs, separated \)y imirli uicb'i-
coiiciivc iiilcrspaces, some of tlie widest of wliieli liave a small second-
ary I'ib in tlu^ center toward tlie mariiin; the ribs increase in elevation
and strength i)osterioily, toward the l)ase of t]\^y rosd-iiin. bnt never
become bi'oad; for a short distance on the base of the roslriini tlie ribs
are nearly obsolete but Ix'como promiiM'nt aj^ain on its <lorsal and ter-
minal jxtrtions; this part is also crossed by iire};iilar raised lines of
•growth which cross the. ribs obliiniely; the inner snrface is covered
with lonnded j;i'oo\ cs corres|)ondin<i' to tiie external ribs, separated
by convex ribs of abonf the samewidtli; the>e l»ccome obsolete aiite-
rioily and posteriorly. The hiniie iinirj;in in the leftvalxe is only a
littl(5 thickened and sli.uhtly excnrved, the cartilage-plate is central,
stont, le^ndarly ovate in Ibrm, with a thickoiu'd inner marj^in; in tiie
right valve there is a. proiinnent, rather stont, elon-iiited j)osterior
tooth, the anterior end of which Joins closely the (tartila.m- plate, leav-
ing scai'cely any notch between; tin; highest i)art of the tooth is near
the middle, the slo])e, however, is ii little steepci- anteriorly: a deep
grooves separates the tooth from the thin, slightly excnr\ed dorsal mai-
gin; anterioi'ly the nnirgin is but slightly thickem'd, and shows a very
narrow, beveled edge externally (or the attachment (»f the thin liga-
ment: a similar but nior(^ distinct ligamenlal gro(>ve extends from the
beak to the base of the rostrum; there is a short, lather stout, rib like
(daA'iide or buttress running from beneath tlu^ nuddic of the tcxUli
obliijuely baidcward and downward in the direction of the base of tln^
rostrum: a less pronunent buttress is also present in the left valve.

Length of one of the largest specimens, L*.~» mm.; ! ight, 15 mm.;
thickness, 1 1 mm.; from beak to end of rostrum, li> mm.; to antero-
ventral margin, 1- mm. One badly broken valve is considerably larger
than this. There are also two young live specimens which measure
about (• nun. in length and .>.") mm. in height. Their form is sonu'what
narrower and longer than in the adult, and the rostrum appears rather
longer and narrower; the ])()stero-dorsal margin is ueaily straight; the
ventral margin is decidedly concave at tlu^ base of thc! rostrum; the
shells are very thin, somewhat transparent and glossy, and have about
twenty six sliai'j)ly delined, considerably eh'vated, nearly equal, nar-
row ribs on the body of the shell, separated by much wider spaces;
the edge of the left valve overlaps that of the right. esi)ecially along
the Ttase of the rostiuni.

In general apiH>araiu;e this species greatly resembles (\ iindticostdta
Verrill and Smith. It <lilt'ers, however, in having a regularly more ovat«^
form with the anterior region somewhat narrower and more prolonged
and the postero-vential margin less incurved at the base of the ros
trum, so that the latter is broader and less differentiated. Tin; exter-
nal eosta' diller in being narrow and sharp, separated by broad concave
inters])aces, and of nearly uniform size, there being no marUed contrast
between those on the anteri(U' and posterior portions of the shell,

808

i'i!>>(i:/:i>i\<;>i or riii: s.iriox.u i/rx/.r.u.

\i'\..\K.

illtlioujili tlic clcviitioii and (listaiicc Ix'twciMi tliciii ^iiaiiiially increase
posteriorly, while in tlie loiiner fliey are broadly ronnded and se|»iira(ed
loi' the most i)art by narrow inlt-rstiees. The hinjic also diflers <'onsid
erably; tho eaitila;^e jdate is less prominent and broader than that of
mulUcostdtd, and the. t<K)tli in the ri.^ht valve is lonjicr and n()t s(»
prominent and scarcely forms a iiotcdi at its Junction with the cartilaj^o-
phit«'; anteriorly the marjiiii is very thin and simple with a veiy nai-
row, linear, li.namental jiroove alon^ its outer ed<;(', while in tlie former
the groove is broader and its inner edj;e is raised almost in the Ibrni of
a lateral tooth.

It also iesend)h's ('. rostdhda \iu. corpiilciitu Dull in the character
of tho costa', but the bittei' is much shorter and hi<;her in lorni and has
a vi'ry short, ill delined roslrun).

Two youni:' live sjx'cimens, two separate vahes, and some. (Vaj^inents
were taken at three stations, between N. hit. td ' L.'!>'. \V. lon^i'. <!(» * 14',
and N. lat.;UP47', W. hmjjf.T.'^o W .!(»", in l,(;sr) t(»l,Sl'5 fathoms, ISSri-SG.

CARDIOMYA MULTICOSTATA Vcrrill anil Smith.

<

i

I

(I'liito I. Will, liu'. :{.)

Xe<vnt muHicoslitla \'ki!Uii.i,. 'I'raiiH. Conii. Aciul.. \, ])..">!», jd. i.viii, (1;;. 10. I.sS2;

VI. ]). 277, ISSl; V.\\)\. Alliiili<it<K, liciioit I'. S, Coin. I'IhIi aiitl I'isliciics lor

188;{, 1>1. xxx, iijf. iL'it, ISSn.— SMini. i:. A., K'eport \oy. ChnJlniiicr. /.oiW.

Laiii«>llil)r,iiiiliijitii, XIII, p. liO. 18«."..
Not Cardlomjin striata Dam., Hull. Mus. ('oini>. Zoid., \1I, ]>. L'iis, jil. in, li;;. 10,

18S6; Hull. r. .s. Niit. Mils.. No. :!7, p. Oti, 1>1. iir, liy. 10, ISSii; I'n.f. T. 8.

Nat. Mus., XII, ]>. 281, 188!t.
Cardiimija striata Dai.i., r.iill. U. S. Nat. Mn.s., No. :{7, i)l. i.xv, lij?. 1L'!», ISSit.
Not ('ardUtiiijia coslellata (Desuayes) var. ciirta l>AM,. Uiill. Miis. I'oni]). Zoiil.,

XII. ]). 2!I7, ISSfJ.
Xe<rra muUiivstata var. carta \'i.:i{iiii,i., Traii.s. C'oiiii. Ac'id., X, ))..")(!(), 1S82.

This coini)aratively rare species was found at but ei<iht stations off
Marthas Vineyard, in 80 to l."»S fathoms, 1SS()-1SSl>.

Although this species resembles ('(irdionii/a sfrinta (detfreys) in the
character of its sculpture, the marked dilferenee in outline, espetjially
in its clearly detined rostrum, render it advisable to keep the two forms
separate until a careful comparison of the hinyes can satisfactorily
deeide the question of their identity.

The two valves desi,u,'nated as variety (•urt(( have the radiating- ribs
rounded and not angular, but fewer in nund)er than the tyi)ical form,
and must be distinct from oiria of Jelfreys, which Mr. Dall makes a
xaviaty of costcUata oi Deshayes.

I

N.).ti:ii). i)i:i:i'-\y.\Ti I! Mi>i.i.rs< a~\ rinni.t. .t\i> nr.^ii. 80!)

CARDIOMYA PKHHOSTRATA Dull.

iri.iirs I, will, li- J: i,\\iv, iiK. :i.i

.\iii Id j)rrn»'lnilii N'l'.iiltii i, Ti :iiim. ( iniii. Aciid., \,|i.."itil, Issj; \'l,|i.J77, |SS|.
Card'iomjia jirrt'iiHlniUi I>m,i., liiill. Miih. ('oiiip. /oill,, X II, p. I'iMl, pi. ii, li^^s. ;!(i, H/i
ISSd; jliijl. I'. S. r.:\\. MiiM,. No. :!7. ji. (Iti. pi. II, lios. Wn, :',},. iSHll.

Only ;i It'w s|(«'('iiiiciis wrre obtained from scvrii statiun.s Ix'twccii N.
lat. 10 ' 1.*)' ;!0", VV. loii^-. 7<r L'7', iiiMl N. lat. ;{'.• 1(1' ;;(»", \V. Innn. 7(» >
T)!', in ."iS to ;!L;."i f'atlioin.s. ISSO-ISSK

Sontli to (iianada, in .').'>'.) to I Ki t'atlionis. -I )all.

I

I

CARDIOMYA GliMMA, new species.
(I'l.il.M L.WI. ti>,'s. ;!, I : lA.MV, (iu. II. i

Xf(iv<t jianristridlii llrsii, Tniiis. Cuiiii. Acnil., \'i. p. ITU. 1NH.">.

Xot Miioiivra piuirislrhtln i»Ai.i,. Mull. Miin. Cnmp. Zin'll.. Ml. p. UOL', issti; Kiiij.

r.S. N.it. .MiiH.,Xo. :<7, p. (IX. \SS[); I'roc. If. S. Niir. Mils. .MI. p. !.';;;!. pi. .\m,li},'.

IL'. ISS!I.
<'arilli»tnin s]i. Krsii, Hull, Mns. ( 'oiiij). /.im"i1., X.MIl. |>. 'JJ7. is;);!.

Shell small, iiuM|ni\alvt'<l, tliin, Iraj^ilc. tianslnccnt, l>lnisli wliito,
sonu'wlnif ovafe, with a well (Idincd lo.struin. I inl>«»s smooth, alitllo
]>roniiiient : the beaks small, ine<»nsj)ieuous. Tiie antero dorsal mai'j;in
is (convex and vises distinctly above tiic^ l>eaks so tlnit tlu^ greatest
heijiht of the shell is in front of them; thence it slopes lapidly to
the somewhat ]»rominent anterior end; the ventral martinis broadly
ronmled with a slight angle at the termination ol" each radial rib,
deciih'dly incnrved at the base of the rostrnm which is a little elon-
gated, nearly sti'aight, somewhat tapered, and rather nplnrncd distally;
the postero (loisal margin is depres.sed and somewhat eoncave. lOacli
valvo has three conspicuous, ])rominent, thin, elevated, distant, radial
ribs on the i)osterior half and a fourth less distin(!t <»iu> at about the
middle; this is rudimentary in the left valve; none of tlieni reach the
umbos. The surface is also covered with very (lelicate lines of growth;
the rostrum does not have a diagonal ridge. The hinge-margin is thin
and delicate; the right valve has a small but prominent, nuxlerately
long lateral tooth separated (Vom the v«'ry nunnte cartilage-plate by a
distinct notch. The lateral tooth is supported by a small buttress.

J.ength, 5 mm.; lieight. .'{ mm.

A few specimens olf (lape llatteras, North Carolina, in Kl and 17
fathoms, 1884.

'- k

sio

i'i;n(i:i:iu\(;s or nil': \.itj<i\ ii >//>/;/ u.

VHf,. \x.

NO. li:i'.i.

i>i:k

CARDIOMYA OLYPTA Hush.

(I'Int.s I.XM. liu'. 1: LX.WI. ti-M. It. 7.)

.V(</)(j lOKidlii III >ii. I r.iii>. ( iiiiM. Aciul., \l. |i. l7-\ |il \i\. i'\<i. '2\. \>*H'>; \'.\\,\.
tlliiilroH^. I.'t'porl r. S. ('(iin. I'ImIi ntiil T isliii ifs lor IHS!!. p. "iST, ISsr>; iioi

Sowcrliv , IMS I.
('(trdloiiiijn oriiiilixn'nuii 1)ai,i.. Itiill. \(ii>. ( Onip. /oiil.. X II, p. 2!tt!, IHH)!; Hull. I'. S.

Xiil. Mii^.. No. :t7. p. (•.(;. i>l. Ml, Ho. L'l. iss!i.

A fVw H|i«M*iiii<'iis wen' tniiiid ill two stiitioiis ulV Ciipc lliittniis. Noifh
Ciiroliiiii. ill 4S f'iitlioiiis. Soiilli to ( iuiidiiloiipr. in 1' to ll'4 Ciitlioiiis. —
Diill.

Ill iidditioii to flic piihlislicd di'scriptioii it slioiild \)v stated tlial tiic
aiilcro dui'sal iiiiii<;iii of t lie liylit valve iis«'.s into a distinct, pidiiiiiicnt,
obtuse lobe in front of the tootli: tliis lobe ovei'Iaps the iiiai',uiii ol tiie
left valve wlieii the shell is closed. 'I'herc is a small luittri'ss beneath
the ])ost«'rioi' lateral tooth. ( )ne broken valve, considerably larger than
tlu^ tyjie. has in the intervals between the three primary ribs two or
three small secondary ones; on the anterior end six ribs arc \isible, of
which one or two are larucr than the rest, so that altogether about thir-
teen or fourteen ribs can be <'()unte<l: some of these are, liowe\er, \»'r\
small and extend only part way to the umbo; even the larj^cst do not
extend over the extreme ]iart of the uiiilio.

Mr. Dall considers this species to be identical with l)'()rbi<;iiy"s oniu-
tissiiiKi, l)iit we see no sunicient reason for uniting the two forms.

'J'lic name cosiaia was used by Sowerby in ls;u.

HALONYMPHA STRIATELLA. new species.

(I'lnt.'s I. XXII, liK-8. 2. \\\ T-?xX\II, Ii-. 10.)

Shell small, thin, broadly and obli((uely ovate, with a narrow, shoi't
rostrum. IJmlto swollen. I'.eak behind the middle. The antero-dorsal
niarjiin is liroadly and nearly evenly convex ; the anterior end is evenly
rounded; the ventral marjii?) i • broadly convex with a slijjht incurva-
ture at the base of the rostrum, which is short, narrow, and obtuse at
tlie end; the ]»ostero-dor.>ai mar^^'iii is stronf.(ly concave and slopes
rai)idly. In the rej2,iou of the umbo the surface is lustrous and nearly
smooth, but marked with faint, parallel lines; elsewhere it is closely
covered with very regular, line, raised cimcentric lines separated by
incised lines of about the same width or narrower; on the rostrum
there is a faint diajional ridf>e posterior to which the concentric lines
are irregular. The interior surface is smooth and lustrous but the
exteriuil lines show through by transparency. In the right valve there
is a small, sharp, ti'iaiigular tooth ])rojecting inward with a very small
cartilage-i)it in front of and contlueiit with it ; slightly farther forward
there is another small, slender tooth rising nearly parallel with the

maigin; extern:

nu'iit occupying:

extending to tl

and prominent

projecting dow

upper siirlaie

near the beak t

thickened ridg<

licngth, <) mi

One valvi', st

78^ 7' .'.()", in ;'.

This sjjecies

the latter is mi

broaib'i" rostri

shelf like clavi<

able distance i

sliell described

be a distinct

nearly the sam

The figure of f

theoiiiission ol

of tlie left val

Xitirn (j'uinn

Three imjie
between N. 1;
VV.long. 7(P

Si'tiVd riiiiii
Ikt, \X>
XIII.i>

Shell snial
gaping, obliii
swollen; be;i
anterior por
dorsal niarg
and evenly i
nous and in*

' Report Vo

N.i.u.m. i>i:i:r-]y.\i I i; vni i.rs<A yr.inni i. .\\i> insii. Hll

iiiiir;;iii; oxtmiiil to tliis tlicn- ;in' i«'iiiii;iiils (»!' a sinall iUiU'iioi' lij,M
iiH'iit nc(ii|iyiii>; ;i slicirt fiiirow. < 'omiiiciiciii;; lM'liiii(l t In- l)ciik iiiul
fXtfiKliiiji' to tlic Icisc <tl the rostnilil, tlicic is :i coiiipiii ;iti\ ely l;ir;;»'
aii'l pioiniiu'iit liiinrllituiiu iuocch.s lisinu IVoiii briiriitli tiu' inai'^^iii atiil
projt'ctiiiy- (lowiiwanl. w itli tlic facr |tortioii Iiroadly roiuidcd, and its
upper snrl'iU'c (•nncavr. Above tiic base ul" tins, and cxtciidiii;;' tVoiii
near tlie beak to about tlie middle of the rostrum, is a iiiinow, sli;iiitly
thickened iidj;e separated Irom tiie <h»rsal miiri:iii by a nari'ow l'urr(»\v.

Len^tii, (I mm.: hei>;iit. I..") mm.; brradt h. about .! mm.

Ono valve, station L*(!;V"t, aiuon;;' l''oraminit'era, N. hit. -7 ' 2li', W . hm;;-.
78"' 7' .".()", in :i;{S fathoms. ISSi;.

'IMiis s|)eeies lias eonsiih'rable lesembhinee to If. rliirinihihi |)a!l,])Mt
the lattei' is more rej;ulaily o\ate in form, and lias a murh siiorter and
broaib'i' rostiiim, and somewiiat coarser scnlptnre. The posterior
shelf like cla\iele also dilfers in form, iteinu (juite mtrrow for a consider-
able distan<(' ne\t the cartilaitc pit. and more expamled distally. 'I'he
shell (h'seribed and li;;iir»Ml b> Snnth' undei' the same name a|)pears to
be a distinct species, and amy l>e identical with our shell, for it has
n«'arly the same Ibi in and auiees closely in the. narrow tapered ro>trum.
The tifi'ure of the interior, liowe\ cr, in that case, is incorrect, owin^' to
the omission of the clavicle, and appaiently the substitution of the hinye

MYONERA GIGANTKA Verrill.

(I'liilr lA.W I. ti-s. I, ."■).)

Nfivrn ij'Kjatitiit X'l.uitir.i.. 'I'nms. ('oim. Acad., VI, pji. L'L';!, L'TT, 1SS4; Exjil. AUm-
tronn. I'fpoit I'. S. Cnin. I'isli and ["jhIh rir-< fiir iss;;, ^i. .",71, iss.'i.

Three iini)erfeet, (b'ad s])eciinens have been found at three stations
between N. hit. 'AS"^ L*L", W. lonj-'. 70' 17' •".(►". and N. hit. ;!7 .")(;' L'O",
W. lony. 70'^ 57' .;()", in l,SL>r) to 1,!>17 fathoms, IS.S.I and ISSO.

MYONERA RUGINOSA (Jeffreys) Verrill and Bush.

(I'latfs I.XXil, lin. I; L.\\I\-, li--. 2.)

yeiira riiiiiiiosd ,li:i i 1!i:ys, i'mc. '/.niil. Soc. London, p. MIL', jd. i.wi. li.n'. 7, Xovtiii-
ber, 1881. — .Smi rii. M. A.. Iv'rpoit \'oy. Cli(iUeii;i<i\ Zoi'd. Lainellilniini liiala.

Ml I. p. :!.'>, iss.-).

Shell small, short, broad-ovate, Jiot juueh swollen, with a short, wide,
j:a pin ji', obliquely tinncatc rostrum. I'mbos small. prominent, not nnudi
swollen; beaks small. ])rominent. incurved, smooth and shininj;'. The
anterior portion is evenly rounded, nearly semieircniar; the antero-
dorsal margin is convex and i)romineiit : the ventral inaryin is broadly
and eveidy rounded, exee])t at the base of the rostium when; it is sin-
uous and iiuiurved; the jwstero-dorsal margin is nearly straight to the

II

' Report Xoy. Challeiiijir Zoc'd. I,:iiii ■llihrancli ata. XIII. p. 52. pi. ix, liys. H-Hh, 1885.

SI -2

i'i:(i(i:ri>i\t:s <>/• ////• \ iiios ti mi siim.

nul III' t lit' short rosi luiii w liifli lias a ilisi iiitM. iiuMliaii. diamMial litli;*' or
a 1 1, mi la t ion aii'.i aiiolhcr less tlisi iiicl our a I ils Uasc. Tlir si if la cr of t lie
mIm'II is thickl\ covciril willi vcrv iiiiiiu'roii^'. ami cidwilitl, roiicfiil rir.
inoic or ifss iiit'ijiilai , raised litii's ol' lii o\\ t ii u iiicli L;i\ c it a liiiclv lam
ollost' appoaranc*' wlit'ii vii'ucil iimlcr a Umis. I'Ih'sc linos hi'ci.iiic iiioro
cfowdt'il, moro proiiiiiiciil. and lorm iwo sinuous \\a\<'> in i-rossiiiL; tlu-
iDstiiim. Color, in alcohol, w into liiiLit'ii with n'ddish Im'owii. liic
li!ii>;»' inarji'iii is (h'iicaic; iho li^hl \al\t' lia.s no lattual tooth l>iit
sliows a slight ihicUoiiinu <»r I he posituiof niaruin; iho cait ii.iiio phitt*
is small, ovalt'. diii-clfd l)a<k\\ard.

I.tMii^tli, <■> mm. ; hci-ihl. I.omm.; lucadt li. o iiini.

One li\t' spcciii fii ^ No. oL'ol h, station LTiTO. N.lal..;i» .".I. W . loiii;.
r.7 r> ;{(• , m l.Sl.; lathoms, 1SS,"».

" I'l'iiKpiiK l''i\pt'diti(Ui, ISTti," oil ('a|it' Miuidt'i:o, in .'Id to l.o;>,"i
tat lioiiis. — .IflVrcvs.

I

$

M. II

MYDNl.KA 1 IMA fill A n.iU.
J'lal,' I \\l\ . ll-.S.i

Sfiiiii liiiiiliilii l>\ii, Hull. Mil-. ( ..iu|i /.>..!. , l\, |> tl'.', issi. Smiiii. \ \..

Id'lio'l \ i>\ . I liiilli iK/i r. /oiil I ..iiiii'llilu .iiirhl.il .1. \l!, p il.', ISS,">.
Mili>li<->it liiiiitlulii I'M I, iillll Mils. ('i>lii|i. /iiol., \ 1 I. |i. IliU ]il. 111. li;;. ,"i. l^.si;;

I ill II. 1. S. \;il Mils., No ST, p. dS, |il 111, I'il; Ti. lss;i.

.\ siiij^lo li\i' spoiMiiuMi ^^No. .'lS17h was taken at stalioii '..'OIS. N. lui.
•10 - , W . I»»iij4, (IS :.(» ;;(l . in .M7 I'alhoiiis, iss.;.

IVlYONl'.l'iA ^ > IM^l' riOSA, n< w nihh ics.
, I'l.ilr l.\\\ II. I'm. :.. 1

Shell small, \riv thin aiul I'la^ilc iit'.iily t lanspaiont . coinprovsid.
•doiij;att' o\ al with a w ell doliiu'd. si)iuo\\ hal t'loiiLialt'd rostiiim. I inlio
prtuniiicnt, sea ice ly td)li(pu' and ncarlN .siiioot h. I'lif aiittMo dorsal mar
^iii is iMUiv i'\. anlci'ior end e\«Mily nuiinU'd: \entral iiiaii:in broadly
ron\r\, l»»'etuiiiiiji' inciir\ed at the base of the rostriim; |>ostero diusal
iiuifi^in nearly St raiuht. The anloro doisal reuioii is distineily e\e,i
\ att'd in front ot' t lu> beaks. The bod\ it\' the shell is oi iianitMiied \\ ii h
ttMi (U iii(U«' thin, distinct, sIil;Ii|I\ raised, concentric ribU'ts separated
by iiiucli wider intiuspaccs. On the ntstriim there are two well marked
minutely spiiiiiloiis keels belween which are delicate lines ol" i^rowth;
the lirst runs tVom the beak ipiite I'lose to and parallel w il h t he dius.il
murjjin ; w liile t he seciuid t'xii'iids tnuii I he umbo di,ij;(Uiall\ across i he
rostum to its low ei edj^'e,

l.eiifitli, (! mm.; heij;lit. o mm.; bre:idth. ;iboul '_' mm.

IMiis shell has no very clost' n'si'mbkiiice lo any hitluMto described.

Oue vah e, st;itioii •_'(;;»,">, N, bit. -7 L"-' , W . h»n>;. 7S 7 oO , in .hk;
latlioins. ainoufi' l'\M;imiiiilera. iSStl.

.\s but ;i U'lt \;il\e was l(Uind. the true positiiui of this sjiciies c;in
not be decided.

7

^^Pn

Mill ;si.

l>lli:u I III: \i(>! I ISC I iiin.iii i\i> i:i sii

Sllj

I'l'

he
If.
Ill
'I ('
lie
he
lilt
lie

I

I

l';imil\ I'OK'OMN Ih.i;.

I'OKt^MYA SUIU.I-'.VIS Vni ill, v.ii u-i v MU'KtUHlN I'A U.ill.
i I'Lilr.s I AW I. li--.. 1, •-'; I.WW II, li-. 1.1

/■(i;Mmi/ii •iiililiiis \ I i;i;ni, I'laM-' ( iviiii. Aful., \ 1. |>|>. 'J'.M. "JTT, |il, \\\u. lij;'.
'Jl, IS^l; r.\(>l. Ilhitlrt''<i. Ii'i'poit 1 S, t'uni, l''i-,li and liMlu'iu-- loi' ISS!?,
|i. ."i7l, pi. \ \ \ . liu r."<, l>^^i l>Ml,l!iill. Mils. Idilili /.oul . \ I I. |,|i, :'S1,
•-'SL', ISMi; Will, |. Il>, l^^!^ , \.m. I> .M; lliill. 1. S. Nal, M il> , \... :17, |..
lis. |,1. 1 \\ , lij;. r_',s, l,s>il,

I'liiiiiiiilil iiliiiiHliiiihi |l\li, run', r, S. \al. Mm'..\I1. p. -.'!NI, |)|. \ 111 , lis;, li. ISS'.t
, \aiii'ly M.

Shell liillifi laii^i'. Iliii-k. w ell :(>iiii(1»mI. ((udiilf, iiif(iiii\ ;il\ cil, \ ciy
liiiiiiil, w il li \t'i\ hilut', intiiniiifiil iiiiiliiis wliifh arc .s| loiiiils ciiixril
loiwanl siiiiall\: bcalv^ lai'ur; liiiiult' siiiall. i't>nlatf, (iHcii iioi m-iv
(li^iiiitl. I'Ih' slu'll \ aril's ciiii^iilcialilv ni i>ul line and m/c and clcva
I lull (iC I lie iiinlxis; in imi>t spi-tiiiiciis llic lici^lit «'(|iiaK or >lii;lilly
»'\ctt'ds I ill' It'iiul li ; llu' oiilliiu' ot' liic ia\il.\ of llic slicll is iiMially
soincw lial flii|il icai, llu> lt'iii;lli dccidt'dlv t'scri'diiiL; liu' ln'ii;lit, luit
.soiiict iiiit';> il i> iu',iil\ (ii'iiiiai. riit' aiiici lor and jklsI ci lor iiiai^iiis aic
iiMiall\ iucKn cNciily Kiiindctl; 1 lir \ nit lal inaiijiii usually inoifcls a
litlli' in tilt' iiiidillt'; tilt' Iti'al^ is .sHuatrd in Iroiit t»l llic incdiaii line.
I '. \lt'i nails tlir shell Is nearly siiiiMiih and i.s cuNered with a thin,
el(isel\ adheieiil. In ow iiish veUow e|ndeiiiiis ; uiidei' a leiis (lie sin-
t'aee shows iniiiiile laised [loinls or l;i aniiles w liie' are ananueil in
radial rows ihat Iteeoine iiioie distinet and eiowded |ioslerioil\ Itiit
loi llieniosi |>irl disappear on the most proiniiieiit part ol' I he miilxis.
I'liese grannie liUe points aie variable iii iiiiinln'r and distmet ne.ss, in
some speciiuens liein^ iiearl.\ ohsolele and in tdliers dislim-t and re^ii
la.rly airanu'e*! ; t he epideiiiiis ol'teii also shows line lines ol' ;:iowtli;
the beaks aie sinoolh and shiiiiiii;. The lell \al\e has a p 'sterior,
wa\('like. radial depression, and ludiind this a low. rounded riilf>o
proieel inu at the inaruiii as a sliL;li' siphoiial lolie: in the iij^iit \al\«',
the eon-espondiiii; lobe and depression are oiilv laintly marked in most
cases, liicriuh; \ al\ »' is larger I liaii I he Icl't and o\ cilaps it eonsidei-
abl', alo,..: the \eiitial inaii^in and boili in I'roiit ot and behind tlio
be; k. . riie interior IS pearlv and olteii shows radial siriatioiis, I'ne
liil.m' inaif^in is eoiisiderably tliiek«'netl and strongly eiirxed; the ri^lit
\al\e las .i huiLie. I hiek, somewhat rounded tooth jiist lieiieat'.i he
beak and adiiatc to the inner siii't'aee ol' the shell, t'oi- >ome disiaiiee
w itliin t he ea\ ity ol the beak and to the Ihiekeiied eilL;t' btdiind the
beak, bill separated t'roiii I he anterior maruiii by a deep. iiir\ ed lui row
in 1 1 u' I una la r area ; I he liiniil.ii inaryin is eoii\a'\ ami so mew hat e\ eitt'il,
a»Miili'at«'d I'ldiu ilu' rest td" the anterior iii.iri;iii 1>> a sli;;lit !n;t«h. 'IMu^
liji'ament isratln'r loiij.', and well romided and its moove extends tor
waidiii a curved I'lirrow under the beak: it extends backward in a
i'iir\cd liuc paralU'l w ilh .In- margin ol the slioll I'or some ilistaiU'O

wmmm

814

f'nnri:!:nr\(;s or riii: vr/vovi/, i/r.s7;ri/.

^■ln.. XX.

NO inn

behind the tootli. Ilxteriiiil to tlic jiostcrior ]tiiil ol'tlir Iiu;iiiifiil there
is a suhniaiij^iiiMl thiekeiiin.ii' or tbhl, cspeciiillx in the riy;lit valve, in
the left Viilv(> the central tooth is K'prescMited l»y an irreunlai'. l)ilol»t'il.
or soinewliat V shaped lliiekeninj;' of the niarjiin. of which (lie anteiim
part, sitnated Just in IVont of the beak, is themore ])roininent: bntthi>
varies in form in dilferent specimens. Tlie poster«»-(h)rsal mar^uin aluii^'
the liyainental i'e<;ion is less tlii<d<ened bnt has a. distinct rounded
rid.ye inside the lijiament.

Len.Lith of one of the larjicst spe-'inens. Iti mm.: total heiiiht, Hi mm.:
height of cavity. iL' mm.; breadth. KI mm, in a more romided speci
men the lenixth is 1.") mm.: total height. l»i mm,: hei.t;ht of cavity,
13.5 mm,; breadth. 11mm,

A few dead specimens of the tyjjical form {nKhlrris) have been taken at
live stations between N. hit, .V.r 15'. ^^^ hdiji". (is^ S'. and X. hit.
37^ ."it;' LM", \V. lonji-. 7()o ."iT' .'5(1'. in l,.V.il to I,!»l 7 fathoms, 188;>-LS8(;.

Se^•eral live and dead s))ecimensof the varietal form (uiicrothntta) ]ia\e
been taken at eij^ht stations between N. hit. .■5!>" '-'(»'. W, lonu'. (iS-^ .",' ai>",
and X, hit. 3(P 17', W, loiij;-, 7.! ' !)' ;;(»", in l,»i;n to I.Solt fatlumis.

issr»-iss(;,

Mr. Dall exteiuls the ran,ue south to l*at;if,''oiiia. in IL'I' i> H>'.\'>
fathoms.

Our specimens show coiisid(Mable \ariation in form as w.'ii .is •,., ilic
])rominenee of the cardinal tooth in the rij^ht Mihc. and thus unite the
extreme forms I\ .siihh ris \'errili. and /'. itiicrinloitta Dall.

I

CETOCONCHA ATYPHA, new s^- jcies.

Slndl short -ovate, nearly (M|iiil;iteral. ;ind nearly e(|ually rounded at
both ends, jiidii'iuj;' t'rom the lines of j^rowth, I 'mhos lather prominent.
but less so than in several allied speiiies. Ueaks rather prominent and
curved strongly forward, but not spiial. Surface stuiiewhat shiniii!.',
and slij^htly iridescent whei<> rubbed. co\erod with a very thin, yellow
ish epidermis with very muneroiis, minute, jiianuleliki' elevations which
are ari'anjzed in rciiular radiatiuji' lines, aiid aie much the most numer-
ous on the posterior end where tlie ladial rows are closely crowded ami
the j;rannles in each are also near to^^ether; on the center the row sand
granules are moic distant, so that the number is only about half ;'s
j;reat in the same sjjace; on the anterior end tlie\ are so scattered :nat
the radial rows are indistinct and the uraunles ar«Mi little larger: oii
the luimliir area they are nearly obsolete. The anterior end and lunii-
lar area are marked by rather cons|)icuous lines of growth which, near
the dorsal marjiin, take the form of distinct, raised, coneentrie rid<;'es.
The antero-dorsal margin is nearly horizontal iind rises np, in a side
view, in an acute edjic, a little hijuhei' than tlu' level of the bi'ak, so a.-.
to j.roduce a broad, compressed, lunular margin. When viewed froa;
above, this ])art of the marnin forms a very marked <»btuse anj^le with
the i»osterior liingtMnaryin, The postero dorsal marj!;'i.i is also nearh

*

r

'IC

1^

NO 1139.

DF.i:r-n'ATi:n MoLLmrA—vFuiuri Axn nusn.

815

f.

%

I

liori/ontal. sli<;lilly coiivcx or nearly stiiiij;lit; tli«' liuaiiiciit is v<'ry
prominent hcliind tlic beak, exlendini;' haekwiird in a ♦•(>iis|ti<'U(»ns
i;r(>()\(' nearly to tlie posterior end. and terminates anteriorly in a deep
narrow yrooNc directly under the beak. In the left \alv«' the inner
ed,i;t' of the [)osterior hin<;e niar.uin is somewhat sinnons; just behind
the beaks, opposite the most prominent part of the und»<)s, it is thick-
ened and sonunvhat revolute, decreasin.u botii in thickness and ele\a-
tion to a shallow indentation of the nnirjiin ; back of this, it increases
rejinlarly in thickness and jn'ondnence and is ayain revolute aloiij;- the
posterior ]>art of the Ii<iamental furrow. There is no central tooth nor
any distinct resilium. In the ri^ht valve the posterior hinii'e-maruin is
even nuae thickened and rc\olute Just back of the beaks, and tlu> in
dented, thinner portion, at the end of the prondnent part of the liiia-
ment, is more marked. Tlie lijiamental groove is consetpUMitly less
conspicuous, bein<r i)artially concealed by tlu' revolute marj;in. The
antero-dorsal marj^iin is., compressed and projects strongly upwanl,
I'isinu" distinctly above the umbos in a side view and is inoi-e convex
tlian in the left \ alve. There is also a sliuht elevation within flu' dor-
sal niarjiin directly below the beaks, which inij;ht be considered the
rudiments of a tooth.

Till' laryest specinuMi. when perfect, would be about 15 mm. lonj^'.

Two very much broken valves, station L'L'lii). N. hit. 37° 38' 40",\V. lony.
73^ K;' 30", in 1.12;; fathoms, issi.

This species somewhat resembles Cetorhoiicd iilfhln (^'errill)' Dall.'
It is however more oblonj^-, with the umbos miudi smaller and less
j'rominent and the bi'aks less spiral and nearer toj^ether. The j;ranu-
lation of the snrtace is somewhat stronjicr and more jienerally distrib-
uted. The liji'amental jiroove is longer, deeper, and the li.iiament itself
is more prominent behind the beaks. The angulation of the hin<;einar-
gin of the lett valve in a horizontal i)laiie is a peculiar feature not fouiul
in the other related species and indicates that the \alves are decidedly
unlik(> in foini. but the rij;ht valve is too much broken to show the
anterior margin.

CETOMYA species.

A broken left valve ( No. r»i.'(>13) from station LMSl, N. hit. 4P T 30",
\V. long. .-»7 10' ir»", in IKI fathoms, resembles I'oronii/a [('i(<niii/(()
(■l(nip(i((( l>all. from the West Imlies and l)arba«b)s, in lOd to II!) lath
oms. It is, however, too incomplete for determination without direct
comparison v.ith authentic specimens.

It is larger and more strongly truiuMte posteriorly than roioiHi/d
jiraniilafit (Nyst) l-'orbes and llanh'y. and the granules are coarser and
not so numerous. It ditfers, more tvei', \ cry strongly in thc^ hinge
characters, for the hinge-plate is much thinner and the large tooth in
the l(^ft valve is wanting in our species.

I ThiiKia iiiliil,! Vfiiill. I'iMiis. Coiiii. .\«a(l.. \ I. )>. L'L'l. ]>!. \ wii. lii,'. L'L', 1881.

■fitorhoiini lliliilu l>all, I'.lill. Mils, Coiilli. ZoipI,. .\11, j>. L'Sl. l,S,S(i.

if

Hlfi

rROCEI'JDIXGS or THE NATIONAL Ml'SEVM. vol.x.x.

Fumilv VHKTICOIIDID.E.

VERTICORDIA GRANULIFKRA ( Verrill ) Dall.

(Plates LXXXVIl. li-r. 2; \('V. li.us. :', 3. I.)

PccrhioUa graniilij'od \'fiu{1i.i., Trans. Conn. Aiad.. \ I. pji. i:!l. IIS, l,">(), lx8r>.
rcrticorilia <irii>iij'ir(i I)Ai.r., I'.ull. Miis. ('innj). '/.<>n\.. \I1. p. L'Sti, 1SX(!.
I'crticorilia (/ruiniliferK Dai.i.. Uiill. 1'. S. Nat. Mns.. No. :?7. i). tili. IXS'i.

In addition to the publislu'd doscrii)tioii, it .should be stated tliat in
the type-specimen (No. 4 IS'JS), the liuiiihir area is small, deeply sunken,
witli the correspondiu}.' internal margin very much thickened, tWrmini;
a stronji, curved, tooth like projection having' a rounded summit, reach-
ing strongly above the margin of the shell when seen in a protile view;
behind this, directly under the beak and beneath the overlninging
margin, there is a triangulai- space or notch for the reception of the
l)rominent tooth of the opi)osite valve; this in followed posteriorly by
a short, triangular, shelf like projection, a little beneath the margin,
which ha^ i depressicai on its upi)er surface for the rccei»tion of its
ligament b t s, in this speciuuMi, no notch or scar corresponding

to the ossicle. -irectly under the strongly incurxcd beak there is a
slight, thin groove in which the front ])artof tlu^ ligament was attached.
The ])ostero-dorsal edf^e is a little thickened and ]»rojects inward beyond
the general line of the margin ; its outer surface has a smooth, slightly
excavated groove, extending ])aiallel with the edge. I'or .some distance;
this portion was overlai)ped by the projecting edge of the opposite
valve.

A very large specimen (No. 78G79) from station L*71.), which measures
LM mm. in length, 22.] mm. in height, and H» nun. in thickness, has, in
the right valve, directly beneath the bi'ak. a very strong, high, curved,
pointed, angular tooth attached by a very broad, thick base, a con-
siderable distance within the iiiargin. llchind the ossicle, well within
and nearly i)arallel with tlu' margin f(M' its ennre length, is a conspicu-
ous shelf like ridge against which the projecting edge of the oi»i)osite
valve rests. The (issi(di' is strong, sonu'what rectilinear in outline,
with the posterior end deeply forked, the inner surface strongly con-
vex, the outei' strongly concave, with thick, somewhat beveled edges,
to which the ligament is attached. Interior surlace somewhat pearly.
Scars ami pallial line not very clearly delined.

l)Ut four s{)ecimens, beside the tyiie. have been found at four stations
between N. lat. Id !)' IW, \V. long. <!7 ^ »', and N. lat. .id- 17', W. long.
7;) U' 'M", in i;6r>{i to 1,6.V.» hithoms, LS8 1-1880.

Ni>. ii:i9.

ui:i:i'-]y.\ TEit M()i.i.rsc.\—vi:in;iLi. t\i> nisii.

S17

t

Family LVONiSlKLLIDJ-:.

LYONSIELLA SUBQUADRATA (Jeffreys.)

(I'hitf I. WWII, liu. ;{. I

I'l fcliiolio siiliiiiiililnilK .1 Kl' l'l!l•;^ S, I'Iik. /niil.Soc. Luinlnii. |i. l:;iL.'. |

NuM'iiilirr, ISSl. Not l).\i.i., r.iill. Mils, ('oiiiii. /.n<;i.. Ml, |). i'

:«,

()iir s|M'('iiii('ii seems to an'icc in t'Ncr.N' respect, exeept si/e. witli I lie
oi'iyiiial (lesriii)tioii and liyiire as j;i\'eii l»y -lellVeyiS, uiirs beiii^- e((nsi(|
erahly larger.

'riie iimlid is prominent and t lie beak is enrved sti'niiyjy forward, pro-
diU'in^' a deep lumilar area which is defined neitlier hy a fiiooNc nor
a lid.ye. The surface is excrywheie covered with small Init prominent
{grannies wliicli are numerous, pretty evenly spaced, and arranged
somew hat dist iiictly in radiatiii.Lf rows whi(di, under the microsciope. are
defined by slight radial ridyts unitinji' those of the same row. The
granulations aie easily visible with sli<;lit (Milar.iiement. I'nder tlu;
compound microscope they liavo the form of elevated, acute cones and
blunt tubercles, their heij.!]it usually j^reater than their diameter, except
oil the umbo, wlieic they aic low and rounded. Internally the surface
is everywhere^ marked with small, deep pits looking:' like punctures
made l>y a fine needle, and correspond in;U' to the external j;faniiles.
The liinjic margin is ihickened and entirtdy edentulous, as desciibed by
.lelfrins. Posterior to the beak there is a distinct .mrooxc in Hie thick-
ness of the niarnin for the recei)tion of a li,i;ament. Ueneath the beak
then' is a sliiiht. (tbli(|ue. marji'inal notch or slit for the reception of the
resilinm, runnin,i;' back within and underneath the dorsal margin, so
that it is scarcely \isibh' in a direct front view.

This shell ajjiiearsto be identical with the species oriiiiually described
and liyiiicd by -letVreys under tlu' name of Peccltiolin nnlxiuddratd.
Mi: Dall has evidently ibiiiid an entirely dilVereiit s])ecies in the Jef-
frey's collection under this name, which he has referred to the ;L;enus
('((llm'(iiili(( and subgenus Wsivoiniiii. belon/^iiij^- to an entirely ditlerent
family from our shell. In order to avoid confusion the shell examined
and described by Mr. Dall should receive a distinct specilic name; we
theiefoie propos«> ('((ll<)c(irili(( ( \'i:si(<nnj/(i) ilalli. Mr. Dall states that
"the sj»ar.sely set, microscopic tubercles can only be obser\('(l with a
maniiilier; to the eye tlu' surface looks sliiniun' and smooth," which
shows the surface to be (jiiile dilfereiit from that of our shell. In his
shell there are also two cardinal teeth in each valve.

One val\e iNo. TSSOO), statiim 2711, X. lat. .".S 21", W. lon.y. Tn 17'
;{0". in I.SlT) fathoms, ISSC.

North of the Hebrides, in r»l2 fathoms: and oil' Cape Mondeuo in
\'ij;() Ua.N. in 7!<t to LO!)."* fathoms. '• I'Drviijtinc Mxiieditiou, ls»i!»-7()." —
Jeffrey;-.

I'roc. N. y\. V(d. XX — yi

W.

818

■Hlilililili

ruocEEDixas of the xatiosm. museem.

vor,. XX.

LYONSIEe-LA CORDATA. new species.

1 l'l:it.' XCW tii-s. 7. S.)

Slioll I'iitluM' lar^e iiiid linn lor llir ^ciius. soincwliaf Iriiiislnccnt
bluisli wliiU'. swolk'ii, ('(»r<l;ite. with ;i itostorior <)l>tiis(' ])r<)iiiiiiciicc,
I 'mhos ])roniiiiciit, tiinicil forward .spirally; beaks small, stron^ls
iiicnr\('(l. Ijiiiiiik' small, cordate, deliiUMi only by one of the (M'dinaiy
line radial rid.u'es; the jtart that lies immediately undei' the l)ealc is
deeply sunken with the edj^c pinched up int(» a prominent keel. 'I'lic
anterodorsal marjj;in is stronj^ly convex and prominent in the lunu'
lar region, but not so hi,uh as the lunbos; the anterior nuu'^in is l)nt
slij^htly convex and nearly ])erpendieidar to the axis of the shell: the
ventral nnirj;in is stronji'ly convex and somewhat pro(bieed in tiu' nuM
die. farther ba<k it is but sli>:htly convex ; the ])Osterior <'nd is obtusely
I'ounded, decidedly ])rominent l)ut not angular: the posteiodorsal mar-
jiin is a little convex and slopes j^iadually. The surface is co\ ercd
with ai>ont sixty «lelicate. radiatinji, raised lines or liblets which are
crossed by line lines of j^i'owth. the thin, brownish or ui'ayish yieen
epidernus often risin<;- into small points at their intersection, especially
anteriorly and posteriorly: thesi' rililets become coaiser and more (lis
taut anteriorly, and are lackinji' on the lunule. The ligament is thin
and stionjr and exteinis backward alon<i" nearly the whole of the dorsal
mar^iiin ami ciir\ .'s spirall\ under and around the beak in the re_i>i(ni of
tli«' resilium, so that the two come ahnost in contact, 'i'he hin<;e nnir
jLiin, in front ol the beak and lunular ar<'a, is stronjily convex and ino
tuberant. rising- nearly to the heij-ht of the umbo: posteiiorly it is
convex and thin in i)oth \alves: in the left one it is stren<>thened by a
slij^ht marju'inal rib within the li.uamental fuirow; both of these are less
cNideiit in the riuht \iil\e. There are no teeth in eitlu'i' valve. The
ossicle is relatiNcly lar<ie, oblon,ii', somewhat saddle-shaped, narrowest
ami tium-ated anteiioily, broa(b\st and forked posteriorly, the divisions
acute. The resilium beneath the ossieb' is well developed, dark brown,
ami extemls tbrward ami upward to the mari^in, beneath the beak.

Len<itli of the largest s])ecimen. 11 mm.; hei.yht, iL'mm. Another is
11 mm. lonu: ll.."> mm. high: !* mm. broajl.

Two living specimens and one valve, at three stations betwe'.>.'i X. hit.
;J«» b-)', W. long. (;s S', and N. hit. .'JT' .W Ki", W. long. 7;; UV :!()", in
1,41';? to l,Si',') fathoms, 1.S8 l-]S,S(i.

r

7f

Family LVONSII ).!•:.

LYONSIA GRANULIFERA, new .species.

iVh\U' \V\ , \\)x. 1.1

Shell oblong, truncated jxtsteriorly, imrrowed and r(tun(b'd anteriorly.
Tin bo rather prominent with (he beak in front of the middle and cnr\ed
forwartlj lunular area considerably sunken. Anterior end evenly

N<i. li:;!).

i>t:i:i>-n'.rn;i; moij.i srA~ri:i;i;n.r, .i\i> ursii.

Sl!l

III

rounded witli the dorsul iiiarjiiii riii)idly sloped ; ventral miirt;in l»roadl\
and evenly nninded: posterior end soinewluit ohliijuely tnineated witli
out any delinite l>oiindary, hnt witli a distinct dei>ressioiie\teiidin,L; fro.,
under the l)eak to al»oiir the middle ol' the ])o.sterior inar;4iii: postero
dorsal inar^in nearly strai<ilit. loii,u<'r, and sloping;- less rajiidly than tlie
anieiior. The entire snrt'ac.'c is covered with ininute. iirej-'iilai'. raised,
j^raniiles and pretty distinct, l»ui irrejj^iilar. lines of growth and sli;,fhily
raised, distant, thin, radiatin.i; lines riiniiin<;' IVoin the iinilio to tlie
niar.ii'in, except on the posteiior end where the lines of jirowfli become
more pioiiiinent ; these radial lines are however, in many places, rat her
faint and seem to consist mainly of the thin, brownish e|tiderinis. which
is laciiin,i;' in certain |)arts. Minute {i'l'ains of sand and shells of foram-
inifera ar<* lirinly adhen'iit to the surface, mainly aloiii^' the radial
lilies, and especially posteriorly. The interior i< white, lustrous and
but slijihtly nacreous. Miiscuhir and pallial scais indistinct. Tlie
liiii<ie-marj;iii is thin; in the left \iilve the anterior IxMch'r is somewhat
thickened in the Innular area and terminates abruptly in a loiinded,
toothdike shoulder Just under the beak ; the posterior niarjiin shows a
slightly raised elon.uated, rou«iliened area for the attachment (d" tiie
resdium. commencing'' under (he beak iind runniii,i;' back for some dis
taiice within the marji'ln. on its nearly ViU'tical inner surface, so that it
is scarc<dy visible in a front \iew. Ossicle not (»l)ser\ed. I.i.uament
very thin, occupying' a urooxc alon^' the posterior inai <^in.

Len.uth, l!>mm.: heijiht. l.'> mm.: bread! h, '.> mm. ; from the beak to
the anterct dorsal anule, 7 mm.: tt> the postero-d(usal aiiule, IL' mm.

One valve (No. ol'otll ), station litlili. N. lat. -to' L'L", W. ion-;-. :.S^
l.'>' lo", in 7"» fathoms, lS8a.

'i'his species is allied to /.. (ir<ii<>f<(i (Moller) with which it ajirees very
closely ill the character <d' the external surface and structure of the
hiiiii'e. It differs in its lon<i;'er, more ovate form, in its nuue jiroduced
anterior end, ami in its less sw(dlen umbo.

Faniilv i'ANI)OKI]).,i:.

CLIDIOPHORA INORNATA, new species.

. I'lillr \('\'. liiiS. r., (J.I

Shell small, much compressed, very ine(|iiilateral, posterior end nar
rowed, somewhat accmiiinate, the riulit \'alv(; Hat oi- slij^litly convex
and the lell vahe a lit tie swollen. I'liilios not iiromineiit : beaks small
and apiiressed. The anterodorsal margin is slij^htly convex and
slopes rapidly to tlu' bluntly roundeil anterior end; the \ (Mitral luariuin
is broadly rounded and slif>htly prominent, consi<lerably behind the
middle, beyond which it is iiicur\ed to meet tiui posterior rostral
aiiunlation: the posterior end is produced into a short, narrow, sui)
truncated. slii:ljtly upturned rostrum, its lower aiiiile formed by a siuiie
what [irominent, radial rib or lidye, extending fnuu the beak (oii the

t i

s-jo

r'i;i>ri/:i)i\<;s or rtir .v i //o.vj/, Mrsr:r\i.

vol.. \X

It'l't \;i1\(m: the pustno (lor.'^nl iM;ii\uiii is ii.>>ii;illy slightly coiicaNr, liiil
is .soinct iiiics iit';iily stiaijilit. :iim1 in some cusps decidedly coiiciiN c. mikI
slo])*'- uiiiilii:ill\ l<i tlif siipcridi' hiil;ii1;i1 ion of (lie ntstnnii; tlic li^a-
iiu'IiIm! aira is narrow, <l('c|>. and lon^. cxtiMKliiiji' lor ncaily tlif cniiic
l«'ii<:tli (iT llif doisai niar,i;in. and is dearly dctincd hy a niai'^inal iid,ii('
wliicli i^ .vli;ir|»t r on tlic Icl'f \ai\«'. In most spccinit'ns tliis \al\r is
inaikfd l>y a slii;iit. ill (h-lincd ^rooxc rnniiin^' IVoiii tin' ltral( toijn'
ant«'ro Ncniral Miar<iin. wlinf it oltcii loi ins a sliyld cniarjiination. hut
is oricn scaifcly disccrnil)!*'. cNccpt by tin' cliiin.ac in the direction of tlic
lines of 'growth and cliaractcr of tlic cpidcrnds. 'I'lic sni'l'acc of tlic
Icit \al\c is co\-crcd witii irrciiiilar coneciitiic riducs and rallicr iiiic\ en
liiic> of L^i'owtli: I lie riulit vahc usually shows rather rcyiilar. coiiecn
trie nndidations on which arc nnincroiis line, pretty re,<iiilar. lines of
growth: this vahe is also usually marked lt\ faint, and rather indis-
tinct. ladiatinii'. impressed lines which aic more or less broken and
often branched or forked: these are scarcel\- visible without a lens.
l'!pi<lerniis thin, biownish yellow, usually mostly jiecled oil in dry speci
mens, inil on tlic anterior end. in front of the radial . 54 roo\-e. it is a
little more ])ersisteiit. In the lelt \al\«' the anterior tooth is strong'
and prominent, with the ])id\imal end the thicker, more ele\alcd,
rounded or clavate: distally it is ciiived and diverges considerbly
from the aiilero doi'sal mai.^in; between this tooth and tlii' resilial pit,
there is a small central tooth onl\- a little elcxatcd. 'IMie icsilial pit
is (iii'cctod obliipiely backwai'd. and its ca\ity is obiiiiuely ui)tuincd.
formiii.u a distinct c\ca\'ation 011 the inner surface of the posterior
tooth with which it is coiillncnt: this posterior tooth is simjily a dis-
tinctly thickened ,iiid slij^htly elevated ])ortion of the postero-doi'sal
margin, which forms the boundary of the lit^'amental area, it is often.
but iiol alwa\s, o])])osite the position of t-he resilial ]»it. In the ri-^ht
vahc the anterior tooth is a slijihtly raised, somewhat curved ridnc on
the inner suit'ac*' <d' the shell, ruiiiiin<;' to the nuddle of the anteiior
muscular scar; the central tooth is shorter and uuich more ele\alcd,
most prominent at its inner end; between these two teeth there is an
additional, sli^litly raised, tooth-like ri(l<;e: the jjosterior tooth is about
as lou^ as the anterior, and uiueli more elevated and stouter, its distal
end bein^ the thicker and hij^iier. with a distinc^t aniiuhir summit; the
oblique resilial pit is e\(!a\ated out of its anterior surface. The ossicle
is s<Mnewhat elonuated, curved or crescent shaped. The interi<»!'of the
shell is only sli^htl\- lustrous and shows but litth' iridescence.

Leujith of one of the larj^'est specinuMis, 1!) mm.; liei<>ht. II iiiiii.:
thickness, about .'i mm.

l''ouiid in (Muisiderable uund)ers at twenty-three stations, n<iiili of
t'ape Cod. oil' tStellwa.ueiis Dank, and off Chatham, iu JO to i-'J fathoms,
187"J-lSvSl.

Tliis species, which is common in the \icinity of ('a{)e ( "od. has proli
ably been contbunded. hitherto, with <\ tritiiualu Say, and C //"»/-
(liaiKi Da II. From the latter, which oecairs abundantly in the same

I

T

i

I

r

N .. ii;i».

iu:i:r-ir.t ri.i: Mnij.i si \—\ i:i;i:ii i. .\si> lusii.

^■1 1

icuioii. it (lilVt'is ill its imirli siiialltT si/c. miicli less iiidorcnt iniriini'.
str;!i.uliln- imstcrndnrMil iii;ii«;iii, l«'ss iiittiinird I'dstniiii. :iiii| luirniw.
(»!• iiiiiif Mcciiiiiiiiiitc. |)Ostfrior liiilt' nl' tlu'slicll. 'I'lir Iniij^f iilsu li jiit'i-s
ill sfVi'iiil icsprcts.

T

C ,T3

KENNERLIA BRF.VIS, new species.

1 I'l.ltr I.WWIII. lius. 7. .(. /'.I

l\(llllirli(l(,'(iri(lHn \i:i!l!II.I, Nolle !■ (il Iv'rrcnl Aiiil. In M.ll. IliViTl.. I't.L'. I'loc,
1. S. Nill. Mils., 111. |l. :!1I7, iS>i; TlMlls. ((IIIM. .\linl., \', |). :,t\-, j.SKl'; \|,

|i. L'7T. is,v|, — i)Ai,i,. IJiill. r. s. N;it. Mils.. No. :;7. |i.t'.s. i,s,»^ii i in ],,.|ii i.

Slu'll si Kill, siihliiiiiilc. vciy iiic<|ilil;itcr;il. iililiisciit I'otli ciiiis. sliiilitlv
iiiiri'owcd aiilcriorly. I'lic iiiitcio doisal mariiiii is siiur! and slopes
ratlu'i' ia|iidi,\ lo tlir anterior end. wlieie it .onus an oi»t ii>e aii^le w il li
tlie \eii1ial niaruiii wliieli is !iro;idl\ and neai 1\ e\ enl\ idiinded. and
passes into the rounded p<)>terior iiiar<;iii w itliont anuiiiation. hut .some-
tiiiies witli il sli^litly siiMioiis eiir\e helow; then- is also, .sometimes, a
\ (■: y sli^lit sinuosity anteriorly : tlie postero doi'sal niaruiii is nearly
straiu'lit. The lelt vahc is ratliei eon\t'\. iiiodei alely t liicU. nearly
sniootli. with a distinct, narrow ladial rid^e rmniiii;.;' IVoiii the heak to
the posterior end. The lij^lit vahc is smaller, eonca\t' or nearly tiat,
lunate, widest behind tiic middle. rcLiuiaily eiiiNcd \iMitrally or faintly
sinuate anteriorly ; its siirl'aee is markeil Ity lines of growth and crossed
l)y ladial grooves, of whieli aboul ten are \ ery distinct, while many
others, mueli liner, can he seen with a lens. In I he ii;..;lil val\e the
liinue consists of two small, diverjit'iit teeth, hoth of wliicli are directed
posteriorly. The rather thin, elongated posterior one. in a piotile view,
isoht"se]y trianjiiilar. its hi,iihest p(»int ilistal to the middle: the slender
resilinm is attacdied to this, nearly the whole leiij^tii of its anterior side,
and carries a. loiiy, narrow ossicle. The cardinal tooth directly under the
beak, is much sliorter and somewhat tliicker, with its Iiiji'hest point
near the proximal end which is close to the dorsal mar<;in. There is
also a sliiihtly elevated, rather indistinct, anterior subinaruinal ridiic
parallel with the mariiin, whicli supports a slender lijiamental <iroo\e.
In tlie lelt valve the liinji'e consists of ii siibmaruinal, thickened,
bbint anterior tooth, runninjn' forward subparallel with the marjiin, and
a posterior submai'j'inal thickening or ridjie havinj;- 1 he resilinm attached
to its anterior side; the V-shaped space is relatively very wide and is
not divided by any distinct intermediate li lues, such as occur in tyjiical
I'tiiKliira. The resilinm appears to be simple, not divided in a V shaped
form as in the latter yenns.

LeiijLitli of one of the largest specimens, ll.-l mm.; height. 7 mm.:
thickness, .'> mm.

Found in small numbers at about ten stations between N. hit. 10' 1")'
30", \V. long. 70 l!7 ,and N. lat. :\rr 10' 10". W. long. 70 0' 10". in 08
to 100 fathoms, ISSO-IS.SO.

This species, which is southern in its range, is closely lelated to the

H'22

ri;in i:i:niM;s of tiii: \ trios ii. mi si:im.

Vol. \\.

noitliciii A'. f/l)(i'iiilis iliCiicli) witli wliicli it was rMimcily i(l<'nlilit'(|.
It is a sinallri'. sli((itei', and iiioic iiillatcd species, witli a slKtilcr ami
more slnpiiij; aiitCMo-doi'sal iiiaryiii aii<l a uutvv cn ciily <'iii\ cd \ cut ml
niai'uiii. wit lidut the distinct antcrovcnti'a! indentation seen in ihal
species. 'I'iic convex valve lias a distinct, posterior railial lidnc wliidi
is I'aiiil Of lackijiji' in A', iilacitilis. 'i'liere are also ditl'ercnces in tlic
iiinyc, in tiie ri;;lit vaheol' the latter tlic te«'tli are nioredivcr<;cr» . etc.
Doctor Oarpcntt'P, wlio estahlisliecl tlie ^I'oni) lunnnliii. {\v\\\\v\\ ii as
«lil1'ci'in^' iVoni typical I'ainlorn in lia\in^' an ossicle on tlic <"irt ila;;(' ur
resijinin. aiui radial j^rooves on tlu' rijilil valve. Teiiiaps the simple
]iiie;ir tbrni of the rcsilinin in Kcintcrlia and its forked or V-slmped
form in triU' /Vn/'/f*r</ i type /'. rostata I-amarcK i may !«' of more iinpur-
taiiee. The intermediate rid^e in the lelt xahc of I'diulura tits hetween
the two divisions of tlie V-sliaped resilium. There is also in h'nniirliK
a small. Imttress-like projection within the margin, under the lieak.
which siippdi'ls an inward projectiiij;' ]>ortioii of the lif;umeiit. dai kep
ill (Milor t hail 1 he rcsilinin.

Faniilv PKRIPLOMID.K.

PEIRIPI.OMA AI^'FINIS, new species.
I I '1.1 1. • l.W.WII, liy. I.)

Shell thin, fragile, broad ovate, with the beaks behind tlie iiiiddh-
and with a short, narrowed p(»sterior end. The antero dorsal mariiin
is broadly coiincx: anterior end nearly evenly roiind«'d, but slightly
produced in tlic^ middle: ventral marjiin evenly convex to the base of
the rostral re,i;ion where it becomes slightly incurved; posteiior end
iiuicli nanow(Ml. com})ressed and produced into a short, blunt rostnini
with the edj.ies <iapin<;' slij^litly at the end; postei'o-dorsal iiiai'inin
nearly stiai.iiht. sloping rapidly to tli<' anj^le of the rostrum: a faint
diauonai iidi;e extends to the low<'r rostral anj^le, ]>osteii(ii' to which
the shell is smoother t han elsewhere and marked with several faint.
radial riblets. The j;eneral surl'ace is covered with irrejiular. uneven
and otteii rather faint, concentric undulations, sejiarated by rather w ide
concave intervals which, like the elevations, are covered liy tiiin,
elevated lines (»!" <;rowtli. The undulations ai'c most regular on the
umbos and become less distinct and more irrejiiilar toward the inaivLi'in
and anteii(trly. and show by transparency on the interior of the shell.
Tlu^ chondrophore is small, but very prominent, spoon-shaped, naridw
at the ba.se and i^xitanded distally, with a nearly ronad icsilial pit.
The ossicle is well develo])ed, bent into a crescent shape, and so Ibiincd
as to lit into the small rounded notch in the shell marjiin in front of
the cliondro])hoies. A somewhat elevated submariiinal ridiic extends
forward from the notch and serves to support the thin liuainent: a
similai' but less i)rominent ridye extends baidcwai'd from th«' choiidro-
phores and delinesa distinct liganiental groove.

a^'K

i

Nm. 11:;!i,

i)i:i:i'-i\ A I i:i; Mni.i.rsi\i—\ i:i;i:ii.i. i\i, i;i sii.

S23

l,cii;;tli ot till' liU'^lisI s|)(Tiiii('ii>, l.lliilil.; lici^lil. Kliiiiii.: tnca ll li.
S mill.

'I'liiTc spcciiiiriis were IniiiMl ;if tlin'c stiitioiis. (ill' M ;n'l has \' iiicyani,
ill KMI to 1 I.', tiitlioiiis, ISSO-Sl.

I his species reseiiiMes /'. iiiiili(liit<i in seiilptiii'e. 1)nt the latter is
iiaii'ower and loiijicr in lonii.aiMi lias a more decidedly longer rostiiim;
its chi<indi(>pii()i'e is siidrter and broader, and not so <Iistinet ly spoon-
shaped distall.\, wiiile I lie niarj^iiial notch in iVoiil of it is relatively
lunch smaller.

^K

S

PERIPLOMA UNDULATA VerriU.
(I'lllt.'S I.XXIX, liH. 1; I, WW II, Wii.-,.)
I'lrijiloiihi iiiiiliihiid N'i'.KiMii, Ir.iiiH. Cniiii. Aiad.. \'l, i)[). 111;!, lis, iss,").

.\ few specimens were I'oiind at six stations botwoen N. hit. .">!> !>',
\\ . lon<;. T.'. ;?' ir»", and N. hit. :W> IL", \V. lony. 71 M)', in .111 to ,sl(»
tiithoms, 1S>S1-1S.S7.

Family LIMP) J<:.

LIMATULA REGULARIS. new species.

Shell small, tliiii, nearly e(piilateral, mncli lii,i;lier than lon^'. with
the liinye line straifilit and rather lony. rinhos and median part of
the shell swollen. l>eaks rather prominent, directly iiicur\('d. Li,ua
mental area relatively laij>e. elonj;ated. diamond shaped, witli the
pointed end exteiidiiij;' nearly to the aii.ule.s of tlie hinyiMiiarjiin, with
a central, more sunken, short, rliomboidal ligament pit which, on ii
separate valve, forms nearly an eiiuilateral triangle. The anterior and
]iosterior ends are nearly e(|inilly curved, a little convex, but slij;litly
nairowe<l where they join the hinj;e niarjiin and form a distinct obtuse
an.ule; on one side, sui)posed to be anterior, below the aii<;Ie the mar-
jiin is sliniilly incurved for a short distance, inakin,u' tliis an.ule less
obtuse than the (»tlier. I'he Neutral mar<.;in is nearly evenly rounded,
formin.u' nearly rlie segment of a cir<de. The surface is covered with
small, elevated, radial ridges sei)arated by concave grooves of greater
breadth; in the middle of the shell between ten and twehc of the
ridges are distinctly higher and thicker; on each side their si/e diiiiin-
islies outwardly, so that near the angV f ^ue hinge they become
nearly or (piite obsolete, the last ones being mere raised, microscopic
threads: in some cases smaller ones alternate with tlie larger ones, so
that the total number can not l»e delini<^ely (letermine<l, but titty or
more can often be counted. There is olten no very evident median
external sulcus, such as occurs in seveial related species, but the two
or three central radii are often, but not always, distinctly larger than
the rest. The radii are crossed by very line lines of growth not sutll-
ciently strong to render them at all nodulose. The inner margin is

'> !

'"Wif

«J1

rj{nrr:r:i)r\<;s ar riir \ iTii>\.\i. }rrsnrM.

\i>].. \\.

(listiiiftly frniiiliilt'd aloii;; llic pnniiiin'iit Ncniral cili^i'. tln' cn'mihi
tioiis corn'spoiidiiiy to tlic «'Xt('riiiil jjmovj's iiixl ridges. Itiii ;it I lu' cimIs
it is sinootii. There is ofti'ii a distinct, nuHliaii iiit«'nial yr()o\«', cxiciid
iiijn iVdiii iM'ai" tlu' ln'ak to tlio middle of tlie Neutral iiiiii'j:iii, hnrdcicd
on eaeli side liy a distinct raised i id^'e, sonietinies lia\in;^'an addiiioiuil
j;roove on I lieir ontiT sides. Tin' liiiij-e niar^^in is ratliei' thin, in-ariy
sfrai;:hl, and a little e\cavate(l or incairved alonj; t he liya mental pit; on
eacli side and considerably within the nnir^in there is a small trian<>'Mlar
biittiess or shelClike process extenilinji' to the anterioi' and posterior
margins as in the allied species, hnt rather larjicr than usual.

Lenyth of one of the lar.ues* :Mecies, (» mm.; height. !>.<• mu' • thii^k
ness, about ."> mm.; length <<f hin^e inar<4in. ■">.<> mm.

A niHuber of separate \iUves, station L'L'(!."», N. hit. M ' 7' l(»", VV.
Ion-. 71 ^ .".5' 4(»", in 70 fathoms, ISSI.

'I'his species is allied to LinnititUt siihoiuitn (Jelfreys) Smith.' which
is distinj^uished by its sh(»rtci' hinj^e niar<>in, more contractc(l I'diiii.
wit h strcmjicr and hijiher radial ril»s and well niarked median sulcus.
It also hudis the incnrvatuic of the margins below tlu' an;;les <il' (lie
hinjjc.

LIMATULA NODULOSA, new species.

Shell sundl. nearly e(|uilaleral, vertically ovate. luirrowed al»ove. with
ii comparatively short, strai.uht, hinye niarj;in. I'mbos prominent, n
little ('(Mupresscd. r>eaks snnill. a little prt)minent, directly ii 'ii\<'d.
Surface coxcicd with ladial ribs which are very fine and ev( ' tiic
iintciior and posierio!' ends, but in the middle rej^ion, becoi.. .uu<h
sti'onj^cr and aie rendered nodulose by strongly marked, raised, eoncen
trie lines and .urooves. The two median ones are much stronycr than
the others and are separated by a distinct median sulcus. The inner
surface is nuirked by radial rid{i,es and yrooNcs of which th(^ median ones
are much the stronger: inner margin crenulate<l \entrally by the ends
of the ribs and grooves. Iagam<'ntal area diamond shape with a small,
short, rlioud)oidal ligiimeut pit in th<> middle. 'I'hc hinge margin forms
an obtuse angle at ca<'h end. the two nearly or «piiie e(|ual ; internal
buttress well developed with tlu inner margin ri'gularly curved and
continuous across the nuddie. so as to thicken the hinge in this part.

Length. !.."> mm.; height. 7 mm.: thickness, about I mm.; length of
the hinge-margin, L' mm.

A single valve, among Fora»ninifera, at station 2385, N. hit. L'S- rt\',
W. long. S8"^ IS', in 7:{() fathoms, ISS."),

This species agrees with />. .suhorafa (Jelfreys) Smith almost com-
l)letely in si/e aiul form, but differs very de(!idedly in the strong, nodu
lose, radial ribs which cover the middle i)orti()n of the shell.

f

T

i

' Limwa niihorafd Ycrrill, Notice of Keceut Acid, to M:ir. Iiivoit., J't. L', I'roi
Nat. Mu8., Ill, p. 402, 1881.

T

NU. 11:10.

liKEVnATiu Miu.i.vsr.\-vi:ni;ii.i. .ixi> /;/■>//.

•)r.

1

i

LIMA rUI.A HYALINA. ni-vv spccie«.

Shell siiiiill, tliiii. tiiiiisliict'iil. vt'il icuHy oviito, soiiicwh il .hli(|ii(»,
;iii(l pi'odiKH'd |M»sltMo v<'iilri«ll\. I liriur-linc strjii;;iil, lathcr shttit,
ruriiiinji' ii wt'll-iiniiki'd aiijilr :ir cim'Im'IkI owiiij;' t»> tlic outliiic oC curh
niiu'j;iii iM'comiiij;- soiiiowhnt (concave hclow. lieaks smsill, ariiti', in
curved. I 'mhos proniiiiciit, smooth, hryoiid which the >\\v\\ is ciisi leil
with iiiimcioiis, ch'iirly ddiiH'd. ratlicr sharji radial ridycs. scparalod
by wider concave iiiter\als; iVom twenty li» t wen t> live oT the radii can
be easily counted; toward tlu' jMistcrior marijin they become liiint and
indi.slinct, wliil«> the extreme marfiin. on l)olh siiles. is snntotli. 'l'\\o
anterior marj^^in is broadly i(»nnde<l ;ind slopes ba(!l<ward l)elow tin-
miiblle; the posterior margin is nearly strai^iit <m' e\ en a little inenrxcd
in its u])per half, but becomes sb<ihtly (ionvex ix'low : t he veiiiral mar
jfin is cNcnly rouiub'd and tlie edi^e is slightly scalloped by the radial
ribs and furrows. There is no distinct median sulcus or larger ribs.
'I'hc lij^ainental area is rather short and Inoad with a r(datively lar<;e
and thick central lijisiment which occupies a distinctly excavated pit in
the hinj^e nnirjiin.

Length of one of tlie larucst specinuMis, l.r»mm.; lieii;lil. 7..") mm.;
thickness, .! mm.

A nund)er of live s]»ecim(Mis. amonj;' I'oraminifera, stations L'.'ldT to
2MI, X. lat. !'!» +, W. loiiu. S-. +. ill LT, to 21 fathoms. ISS,').

This species somewhat resemldes LiiiKituhi ctni/'iisii Smitii. which was
alsit taken in the north Atlantic and West Indian areas, in ir»(i to l,l."t(i
fatlH)ms. Our sp«'c,ies is, however, more compressed and more ol)li(pn',
and the radial ribs do not extend to the extreme mai'Liins as in ihe hit
ter. 'i'lic hinjic inar.i:in i also relatively shorter and the iiuamcnlal
area lar,!-'!'!', so that the beaks aic more sei)arated.

i

82n

I'Hoci'.i'inscs or Tin: xtrmxti. mi.<i:im.

Vnl,. \\.

I'ECTEN MuIUm', I77('..

/'(■(7(» ( Isf- s<M'(i(ni 1 Ki.KiN, I7.">;{ -j- /((/((.

I'lctvt) Ml I. IKK. I'roil. /(m"iI. Diiii.. 177(1 { fxo-.i]. -I>\('<)>|\. 177S. • Itoi .ii-x, 17:1s

(irsti i(;tc(l I, ('i\ ii:ii, 17'.iH. I.amai;< k.SvsI., IsdI. N I'Mikii 1 . I'laiis. ( (inn.

\i-.u\.. . PI), nil. S'l. ill, |S!)7.
.Iiiiiiru >i III MAiin-i;. ISI7. -I>AI,1,. ISSi; (iKirfi). h'l-i in;!;. I,ss7.
loiii II..1111I A. \iiAM^ (allir K 1 i;iN ». l,sr>S. — Sidi n vk \, Mnn. 1 iculu^. >iiiw\ ..i

liiili;!. ( 'ii't;i(((ins I'l'lcix |mmI I'.iiin.i. 1 1 1, p. I.T,. I,s7l . - /i 1 1 1 1,. jwi
/ iilii I- .lanird CliKNT. I.SIIL'.

Ti/pc. — I'fclrti iHii.riiinis ( LiinM'Us).

Since I'.oltcii. ill 17!is, (Iciiiiitciy rt'slriclcd Mic iimiu' I'rctni lo tins
^^iniiii, liis icsdictioii lias itivcodciu'c <»vt'r thai mC S(liiimarli(>r.

Tilt' slit'll.s aiT i^ciicrally larj^c and heavy, and thr \al\('s aic vciy
nin>(|iial, even when xery yoiiii.u'. 'IMn' ri<;li(" \al\t' is slrnn-ly cohm-s
wilh a hir<ic and iiiiich incurxcd iiiiihn and hcak, whih- the h'll \al\t'
is Mat or cvrii ('((iicavc. It is nsiially siiiallrr than tin- rifiiit. and >hiit>
<d(»s('ly inside of its scalhjpcd mar,<;iii. and its luiilio is nearly 01 i|iiiic
obsolete, 'riic aui icles are of iiKxIerale size and not ol)li(|iie. anil in the
ri,ulit \alve they are stroii<;-ly convex or <'\ciir\ed in the middle. This
vm1\(>. lias a simioiis. t'xcurved l»yssal notch, with obsolete jx'ctiiiiijiiii
tet'tli. The surface of both valves has sti'oiij;- radial ribs interlocking;
at the margin. Intenially there an> anj^iihii', thickened, and tinted
radial ribs opposite the external grooves: these ribs become mure
proiiiincnt and biearinate or llnt«Ml near the niaruins.

■^

AM USI IJ M Holt.Mi, I7M8.

.imnsidm l!ni.ii;\, I71*s. - M ini.i ki di. 1M 1 .— Si iir i ai iikk. 1s17. Wi hhiu vi;i>,
iSdC. — I >Ai,i . ISSi',.--- \ i;iaai.i , finii.-. ('nun. .\iacl.. .\. pp. r>7, im. 111*. Is:i7.

.ImiiKsiiim 11. .111(1 A. .\i>A\is. IS.'iS 1 //(((x).- Si(ii K VK A. Mem. (icdioii. Sni\.\ ni'
iiKJia, Crclaccdii.s I'c1(H',vi>oiI I'iimia, III, p. iL'd. Is71. — l'i-(iiii;, l.>>7.—
ZrrrKi.. 18SI.

I'ldii-Diiiriiii Swain. is|n. -('iii;Nr. 1S()2.

I'Hln'. — AiiiKslinn phiinmccfr.s ( Lininciis).

Ill this \eiy distinct yeiiiis the shell is round, thin, neai'ly siikioI li.
and strongly compressed. The surface is often polished, somciimcs
lightly radially striated, iiexcr sti'on<;ly ribbed. The niarjiius aic sim
pie and thin. 'I'lie val\es may be a little uiiejjual in coii\e\ii\ and
usually dilfer in color and somewiiat in .seiil|»tiire. The \ ah es niiiie
toj^etlier venti'ally. but usually ^ape at both ends, 'j'lie am icle> ;ire
small, syiiiinetrical. neat ly eiinilateral, often with lateral crui;i : ilie
byssal notch is small or ab.sent. pectinidial teeth nearly or ipiilc ;iiior-
tive. Theadiill pmbably has uo byssiis, llinj^'e-plale simple. Iiilciiur
of valves sti'en},nlieiied by a number <d' raisetl di\erg'eiit ribs. 01 lira',
iiidepeiideut of any external sculpture.

IC.

J

^" "■"' iii:i:i'-ii .111:1; M(>ij.rsc.i—iri,'i;i/.i, .i\7> /;/ .s//.

S27

CHLAM YS H..I1..11, 17'.>S.

Cliliiiinis l!i.iri:N, Mil-. Hull., l-i cl., |>. \t;:,. I7;is, ir-i 1 irtol. — I'is( ii|,:i;, |,s.s7

jliU n).

fii Ini Sriii MACiii'.i., 1M7 ( Kisi 1 irirrl 1.— \ i;i:i;i 1,1., I raiis. ( cim. .\<a.l.. \. |.|.. r.S,

S!t. HI, IM>7.
I'ifliii I iiiirs ■.\\\t\ I'liliiniii^ I pdi-s \ II. MMil .\. .\li,\Ms, jS.'iS, ('iiiM. I.si'.'j. /ii

ii:r,. \y-s\.

I'lilrii > 1 1 i|,|c /l\ A. JSTI I l(v-l riclcil I.

7'///yr. — ('liliDinis ishnitlicd (Miilh'ri,

Tlic ori.uiiial typrol' tin's ,y<'mis is identical witli /*. ishnnlinis ( Mi\]]vy).
'riicrclun' this sliniild Itf iiddptcd. witlioiii ijiK'stioii. as (lie hue tv|t<'. as
lias iiccii done liy l''isciici' and otlicis.

T'lic tyjiical spcrics o\' ('lihiim/s aft- iiiuh. rounded, smnewliat ()l>ii(|ne,
(leail.v e.|Uival\<' shells, with lar.^c in<'(|uilaterai and (>l»li(|iie auii( les,
a liii.ize i».\S'-al notch, and several peel inidial teeth. The sinl'ai'e
is stronulv railially sculptured, with both jiriniary and nniiieioiis
interpolated iil)s. increasin.u in inirnl>er \vit!i aj^e. 'Die rihs are jiener-
ally crossed l)y concentric sciil]»l nie, olten fbiiidii-; i-ouiih. scale like
projections. The mar-ins are scalloped and liie shell closes rather
tightly (>\cept at the hyssal area. The inner surface has ribs and
double tliitiii;;s, eorrespoiidiii!.: to the external .grooves and radii. The
hin.uephile has y-enerally two slii^htly di\ crycnt ril)s on ea<'h end.

ter^

J

PALLIUM S<liiiin:wli(M', IS17.

I'lilliiiiii S( iri MA( nil;. |si7. ll.anij \. Ai>am>. ls.')S.— Ciii \ r. |si;-_' _ s im k /k a
ISTI.- Zii iKi . l.ssi. I'i-( III 1:. l)ss7.~-\ i.ioai.i., Ir.-in-. Cumi. .\..mI., .\, |i|i.

r.!l. Sil, ill. |,1. \\|. ;i;ir. i, |,S!I7,

lu iiiijiiri, I, i,'i I'i'ii.. is;!").

V)//»c. — rdlliinn plica (Liiiiia iisi.

'I'lie special leutiire of tiiis Ncry distinct lii'oiij) is th<' development of
several iiisiially threei well-marked, nearly traiis\eise. blunt lecth.
alteniatin.u' with distinct jiils on eacii end of the hin.u-e-plate. The
shell is elevated, rather thick, with exiernal, larjic obtii,-,e or rounded
ra'iial rii»s or co; nidations, and witli intenial. angular, double or bicaii
nate rilis opposite the cMeriial -looves. near the iiiariiin. The auricles
are small, but liiiih. The hin.-e teeth are marked vitli distincl cross
lines.

HINNITEZS noCr'aiue, 1 82 I.

Iliiiiiihs \i;i;iaii,. ri.in-^. ('nun. .\i .111.. \. ii)>. .'.li, >!i. ill, ]S!i7.

Tfipr. — /liiniih.s i-<irh.ssi Defiance.

Shell free and much like ('hidim/.s. when yonii^. but later m life it
be(!(tnies attiudied by tiie riuhi vaLc and irreyulai.

IHMIIMI

828

vnocKKinxcs (IF Tin: x.iriox.ir lAr.s/:/ ,u.

Vdi,. XX.

HEMIF^ECTEN Adams nnd Reeve, 1849.
Ifrmii>iil< II \Ki;i!li.i.. 1 raiiH. Coiin. A<;i(l., \. pp. (U), .'>;!l. !M. lS!t7.

Tj/jK'. — lit iiiijXilin J'i>rlK'si(i>iuH Adinii.s aiid K'ccvc.
This iiroii]) incliides species witli thin, irvcuular sliclls nttiiflicd l»y
(h(> riiLjlit \alv«'. like lliiniifcs, but the al tarhiiu'iil is cncctod iiiaialy
by a |i»'riiiaii»'ii1 iiio(lihi>d l)yssiis. The postci'ior aiirich's arc iicai'jy
()))S()lctc. 'I'hc byssal iiotcii becomes irrej^idar and nearly inclosed, as
in .1 noniiii.

PSEUDAMUSIUlVl H. nnd A. Adams, l858.
rnriiiliiniiinii()n { iKirn) II. and A . Adams, i.^.^s ( ,i ftcr Ivi.i.in i. Cmknt. 18(12. — sro-

IK/.KA. lS71."-/aTlKl,. ISMl. -l"l-(IIF.l!. 1SS7. — I )A I.I., ISSC (;)(((•••*). -\' i;i!l; 1 1.!..

Trail--. Conn. Acail., .\. i>|i. iH'. W. !•-!. |il. w ii. ti^■s. S. Sa. ISHT i rcstricti'd ).

'l'i/}» . — lsci(il(()iii(fii>i)ii r.,()ti<-i(iii (ClMMiinit/,. Ijaniarck).

Tho tyi)i('al species ol" this jiroup ha\e nearb -"nooth, round, syni
metii<'al, closed siiells with well delined, small, . tij^ht, obtiis<'an,L;lcd
amiides. The valves are nearly e(iujil and have nearly simple.
even inarj;ins. The external sculpture consists of small radial stria' or
ribk'ts. without stronj; auiiular ribs and grooves, and it may ditVcr
on the two vahcs. Some oi' I lie s|)ecies show the line diveryiMit
'■camptonectes sculpture" on one or l)otli valves, especially when
youn.u. The mariiin is nol scalloped, or but faintly .so. and there are
no deliuite iiitciiial rib.s. The hinfjeplat*' has usually but one iuni^i
ludinal fold on each end which is feeble and nearly i)arallel with the
niarjiinal liuanu'utal <iroo\(' and is usually cross lined. The b^s^al
notch is small and the pectinidial teeth vary from one up to live in
nun»ber, or sometimes nniy be iackiu};'.

CAMPTONECTES Moo!<, 1804.

f '(/m/)/i)M('c/»'.s Mkek, istil. — Sroi.ic/.KA, ISTl. — /aiTia,. ISSl (typf, airiitilny {iit\i\
I'n-H). - \ laaaii.. 'Irans. Conn. Acad., .\. pp. d2, !tO, !tl, IS'.IT.

'/'///>'. — ('(imi>ti>it(cli's IciK (Sowerby'i.

Shell siiboxaic. plain, not corrujiiited. and without strouiv I'adial
ribs: marjjiii nearly plain, \iil\es snbeipial. Auricles unequal; byssal
notch well dcNcloped. Surface ol'the shell cover(Ml with line, obli(pu'l\
diver;Li«'nl. curved, creiiulated or vermiculated riiilets with inti'rvenin;;.
iianow, ]»unctatc •:i'o()ves.

'I'lie curious vermictdaled seulpturi^ is not i»eculiar to this division,
but is more or less ol',\ ious on the shells of s(»me species of I'si mhi
iinisiinii. ami (»n s|)ecies of se\eral other jjronps, both with and without
ladial ribs, li is a struciural feature that runs obliquely across the
rtbs and .!.'.roo\es. Most of the species are Meso/.oie fossils.

The recent I'rcfru filriatiai and /'. tujr'nnis Lanuirck, (d' llurope.
apparently belonji' ti> this j>r<tui», and /'. tvsi(V miy^ht als(t well be
referred to it. The latter is one of the types of I'ttlliolion which
ndjiht w«'ll be reoarded as a 8e«-lion ol this genus.

Nc. II :!'.».

iii:i:r-\\ A ii:n moi.u sc.\~i i:ni;ii.i. ixn /;/>//.

X-J\)

LYROF^ECTEN Coiitnd, IS(i7.

I.iviijii vU'ii (d' si\ iTiil 1,1 tcr aiillims.

I.iinifici l( II (liMtAii. lS(t7. — \ i:i:i;ii.i , I' ran-. Cunn. Aiaii.. \, pp. c:;, .S'.t. Ml. |S!tT

/'///". --l.!/rojK'chii iiodosiis ( I.iiiiiii'us).

Shell lai-.m' and strong-, corni^i-iitcd. w itli lar^c, lliitcd, and ii.siiall.\-
nodose, priniary radia.l ril).s, wliieli do not increase in nundiei'. and
witli coarsely scalloped niar<iins. N'ahcs somcwliat unc'iual. Ami
clcs of niediuni si/e. nnc(inal. I lin^^c |»larc wiili scvei'al, usually tli (■(•.
«>l>li«iuc. divcrueiit I'ihs on cacli end. This is one of rlic hesi delined
.m'onps. and may he re.uiU'ded as of y-eneric value, it is allied to
/'till ill III.

PROPEAMUSI II M (ii'tHjoiMo, 1,SS3.

l'ii>ii<itiiiiisiinii ( sllliiji'lius I D.M.I., r.lill. Mils. ('uui|>. /iKil.. \\\, )i. JIO. ISKll.—

i"i--( HKi!. ISsT. — i.ycmiH) \ki!1U1.i„ I'imuh. Colli). .Vcad., X. ii|i. i;i, !t(), i»2, pi
\\, \\\i^. r.-ii, is;i7.

7'///>c. — I'ntjxiiniHsinin iiicijiiisciiliitit ('rilteri) = Proiiatiiitiisiinii J'nics-
Initiiiii ( I'^orltes).

This uToup is allied fo A iiinnii(i)t. It in<'ludes small, mostly deep sea
species, with thin, louuded shells, havin,^ the \al\es nne(|nal in si/e
and sculpture; the lower and tlatter one is couc«'ntricaIly <>roo\-ed, and
usually turns up at rlietliin niar.uinto meet the upper \idve, as in ('i/cln
jintiii. The iippei' valve may he cam-ellated or radiall) scul|)tured.
When lull ,ur(»wn there are several well Idrnicd. laised. internal rihs;
these may be absent in the youny.

'I'his division dil'lers tVom AiiiKsiinn in the sculpture of the vahcs and
in ha\in<;- the auricles and byssal notch well developed.

The species closely resemlile those of ('iifli>jii<'lvn : the {\\\\\ olivious
ditl'en'uce in the shells is in the j»resence of inti'rnal ribs.

PALLI0LU1« Monterosato, 1884

I'liHiiiliiiii ( .--iiliut'iHiw HI >(<lii)iii \ i;i!iai,i., Trails, (nun. .Vfad.. X, pp. 115, '.Mi, lU,
pi. \\ III, li^s. (I I I, ISMT.

ri/jiis (■itnl.—riillioliiiii /r.s7rf' ( liivona) and I'nUinhiin rilrrinii (('hem
nit/, I.

This yionp is separated IVom l^stinhimnsiiini II. and \. ,\dams. and
<'an scarcely be distin;;uislied trom (Jitiiiiitoncchs by any i;nowii cliar
acters.

The two species named by its autlnu' as types a^i'ce in ha\ iny thin,
rounded, nearly e(|iiival\((i shells, with the post«'rior aiirid.' poorly
de\<'loped. au<l with fine camptoneetes sculpture on both vahes. with
small radial liblets. and usiiall.\ with rows (d' small scales. The mar
uins are |)lain and come evenl.\ together, without tlattenin.!.;-.

■^ tJ

■IMM

S.'iO

i'i;()ci:i:i)f.\(is OF Tin: .v.r/vo.v.i/. mi skcm.

\iii,. \\.

JEQUIPECTEN Fischer, 1887.
.I:il,iil„ri,„ (siil.-.'iiii-. ..I r/W„//(//.si \i:iii:iii,, Timiis. ((inn. .\<-ii.l.. X, |.|'. •'.'.'. il?. .^'.i,

'.M. i>i. w I. lijjs.c-i I : |ii. \\, lius. I-:;. r,. ti./. ismt.

hlfu. — .Vlijtiipicii II iijii iiidiirix I liimiiftisi.

siicll Itriiiidly icmiidcd. witli tlic valves iicinly <'«iii:il ami synrnK'trical.
Auricles well tiiriiM'd.aiijiular; hyssal notch well-developed. Tliescnlp-
tim- consists of a inodei-ate luiiiiber (d" lar,ue and nearly ('(pial primary
nulial ril)s, wliicli increase in si/.e, l»nl arc not mucli increa.scd in nnin-
ber with a,u('. l»y tiie interpolation of \\v\\ ones. Inteinal rii)s oi-
tlutinjAs correspond to external grooves, hut each one is hicai inate or
aou\)le, csju'cially near the mar-ins. Ilin-c plate with one or two
sli-litly di\erj;ent ribs at ea(di end. often cros.sed by siron<i' transveisc
iiK isioiis. i'ectiiddial teeth abortive in the type, but present in most
spe<-ies. The foot of t lie type species is subeylindrical. well(lc\ t'lopcd.
with a byssal lissure and a terminal, deeply bilohed •' .scooped sliaped "
disk, which can be expanded. In ./•.'. irr<i<li(iiis ^ the foot has a similar
structuie. bnt tiie ternunal disk appears to be smaller.

f^ECTlNELLA V.'imm 11, 1 <S97.
/•,,/;»-//„ \ i:im;ii.i. liMns. Cnnn. \,a>\.. \. pj.. (is. !Mi. !t2, IMtT.

riijH. — rrriiiii Hii sUisIki (Daih.

Shell small, thin, swollen, nearly smootli. with convex and slightly
unequal vahes. Auricles vci'y uneuual. oblique, the anterior hir-cr.
with a <lccp byssal notch in tlie riiiht vahe. but without pectiindial
teeth: jiosterior auricle small. 'I'lie surface is smooth except for line
lines of jjrowth. ( 'aini)t()iu'cte.s sculpture is not present. The texture

is not hyaline.

The only known species is I'nflnrlhi si(iNhci (DallV whi<'li was taken
by the lihd.i' Mxi)e(lition in the \\'est Indies, in \r,S fathoms.

LISSOPECTEN Verrill, 1897.

/.;.^^f>/((r/(»; (Mil.jit iin> of (hliiiiiiis, \ i;!:i:i 1,1.. I'liiii.'^. ('cnin. A.M.l., X.jil'.f.S, '.m. HI.
IS! 17.

Tflpr. — Lissiiprrtni lii/oliuiis < Tolii.

Shell sli<ilitly iiMMpiivalve. broadly rountled. not ultli(|Ue, ihin. trans
liU'cnt, nearly smooth. The external sculpt nre consists of fain!, nearly
ol».s(d..|c radial rid.^cs and obscur*^ I'iblcls. init one or both anriclcs may
have a more or less cancellated sculpt nre. The intericu' .sculpture con
sislsof very distinct, sinijde. raise<l ribs, .\uricles au,unlai-. wcll-dcvel
ojied. r.ys.sal notch deep. I'ectinidial teeth pnuninent, Mar,yin not
scallopetl, nearly plain ami sirni»le.

• i'.idi. .Mns. loiiip. /••<"'l.. XII. !>. 21';!. \>\. i\. liy. -', l?<'^"i-

*^

Vc J

NO. 11 :'.!».

i>i:i:i'-]v.\ri:i; mollisca-] Eintu.L asd hi sii.

H'M

Alrlioiiuli tliis jjfrfMip iiyrccs witli Aniirnhni/ in Imxin^ intfrnnl ribs
willioiit ('((iTcspoiKliiiii- cxrcnial ^roovos. it seems to "he nilied r;iilier to
Clildiiti/.^. il may l».e icyarded as a (li\isioii of tlie latter in wliicli tlie
external radial lihs lia\e (leiiciieratt'd.

W^

^

LEPTOPECTEN Vorrill, 1897

•.rjiliipi (7. /( 1 ^iili'^ciiii- ttl' Clihiiiiils \ \ I a; i; 1 1,1,, 'l'r:nis, ( diili. A(;Mi ., \, |i|), li',!, S!l, ;i|
IMI7.

Tjljif.- I.< ptojK ilcii iiioiioli iinris (('oiirad .

Siiell ti:iii. 1 1 aiisliict'iit. ol>li(|iie. hiuailly rounded, with siron"'
rounded radial lid^es or folds, like eorrn.i^at ions, wliieli apiieai in
reverse on the interior snri'aee. Tlie internal ribs are not ani^idated by
a deposit of shell. m>r dislinetlN thickened. Mar,i:iii w it h bioad sea!
lojt-. The exterior snrla<'<' is covered with line (li\-eioent cainiitonectes
,sciii|ttnie. both on the ril)s ami inter\als. The ribs do not increase in
ninnbei' with aye but bee(»ine broadei' ami more tlalteiied. .\iiricles
lar-cand In'oad. t hin. corrugated. Ityssal notch laruc and deep. I'ee-
tinidial teeth prominent. I linj^c plate thin and but little dil'ferent iated.
Cardinal ridji'c thin and snndl. elose to the ligament, ciossed i>y tine,
incisions.

\fc.i-j

PLACOPECTEN Verrill, 1897.
/'/,(,,(/)( ( Il II i ->iiliuriiii- 111 < 'III dill /i-i \ \'i:iaai,i,. rr.iiiM. ( iiiin. \i ,i(i,. .\. |i|i. il'.t. s:i, ;)|

|il. \ \ Ml, ll^is. I ~7 : |p1. \ \. lii;H. 7. S. S(( ; |il. \ \l, liii.s, t !'((, |S!I7,

Tiflx'. — /'hii-ojifcli II cliiiloiiiiis (Say).

Shell lar^e, compi'essed. broa<]ly rounded. ratluM' thin, with simple
sharji ediics. meetiiifj: eveidy veiitrally. but .yajiinji- c(Misi(lerably at
both ends. es|»ecially when adult, \ alxcs oidy slightly nnetjUal in
form, the ri-ht one beiiij^' a little Hatter, but t hey dilli-r in c(tlor and
somewhat in sculpture, the ri-ht one beinn- smoother and paler. Txttli
ha\e tine radial lines or rildets. and they ha\f vei miciilaled diver.ueni
riblets when yoiiiit;. .\uri(des small, symmetrical, nearly eipial.
Hyssal notch ^;mall. sim])le. I'eclinidial teelli .uenerally obsolete, except
when yomii:-. No internal rilis. Inner surface often with more or less
pearl) luster and a cr> stallin*' sirncriire. Iliiiye-platc wit h t w(» leeble.
slii;lilly di\-er'4eiit rilis on ea<'h end. crossed by line transxcrse inci
sioiis. The foot is well develop«'d. obliijue. sliL^lilly narrowed distally
ami enlaii^ed at th«' end. wlu're it is divided into two l<d)es by a rather
deep, oblitpu'. lon.uiludinal lissuie, so that the lobes can be sprea<l
ai»art ()!• closed at will, thus resembling somewhat the foot of I.clidii.
Tow ard the base, on the atiteiior side, there is also a -hort. deep byssal
slit, termiiiatiii,^ at a prominent tubercle about the middle of t he front
side.

I'lMiis, ( iiiiii, Aciil,, .\, pi. \ \, lig. s.

s;;2

BS9B

ri;n(i:i:iiiMis or rnr. satiosal miskim.

V(II.. xx.

CYCLOPECTEN VciiMll, 1897.

Cij,h>ii<iti II \i;i;i;ii.i.. I'laii^. ('.piiii. Ai;iii.. X. i>)i. 7n, IM), ML', pi. .\ \ i, lii;. 1; jil.
\i\. lius. 1-1, isitT.

'I'lljus. —Cjiclopi cttii jitisl iiloKiis NCi'iill MiMl Cyrlo/tcfhii inilirij'cr
{ L(»\i'ii).

Slit'll.^; tliiii, iomikUmI. scaiccly ()l)li([iu', with syiiiiiiotrical auricles and
siiiiitic iiiai.uiiis. 'i'lic two valves ai't^ unlike in s<'n]]»ture. The i'i>;iit
vahe is a lihle liattened and n[)turne(l at liie lie.xihk'. niar|L;in, so as to
tit ti.niill\- against tlie upper \alv('. Tiu; tliin h)\ver valv«? has, in the
typical spcci(>s. rc_i;iilar. tliin. ch'vated, concentric lanu'lhe, wliich aid
in tlic adaptation ot the edjie. to that of the upper valve; the maruin is
usually liattened or bevelled. The upper i lel't i \alve is radially scidp
tuicd, larely smooth; it usually has radi.il lows of arched scales,
l)nsiiiies. or points, and also coneentri(^ raised lines: it is sometimes
cancellated. Ni> radial rii)s. nor iuterlnckiu<;' points at the margin.
Anri( Ics well developed, subeiiual, annulated and well deliiu'd at l)oth
ends; hyssal notch welldelined: lew or in» pectinidial teeth, Cardinal
folds sin.ule, ratliei' feebly developed, often cross-lined. Myes few,
l>yssus small, aiul of few threads.

This ucnns includes a larjuc nnndier of small species, mostly ironi
<leep-water.

HYALOPECTEN Vcr-iMll, IS<)7.

Ihiiihijii ill II \'i i;iai I.. Tiaiis. (niin. Ar.ul.. \, |i|). 71, !Mi, ;il', pi. wm. liu. 5, |sii7

Tj/in. — Jhi(il<)ji<<-ti II iniddliis Verrill.

Shell compressed, thin, hyaline. N'alves nearly etpuil, with concen-
tric undulations or con'u.uatious, atl'ectinj;' the <'ntire thickness; niar-
ji'ins simple; sculpture iu)ne. or consisting' of tine radial lines on one or
both vahcs. without canii>toiu'ctes sculpture. Ilinj^e-plate thin and
nearly plain: auricles wcll-dexclopcd, nne(jual; bys.sal notch distinct.

I'or the possible relation.s of this j^rou]) to the Mesozoic f;enus. Si/nci/-
cUntcmn. see the orii^inal article.

The species recorded are as follows: //. ilihctiis N'errill and liush,
fiom I. Si;; fathoms, off .Marthas N'ineyard: //. /)vf/////.s (.leffreys,, fiom
northern Murope and the Arctic Ocean, and off the I'nited Stales
coast, in '>'!^ to \ .~)'2'> fathoms; //. iinihitii.s N'ei'rill, oil' the liiiled
States coast, in l,l'J.> fathoms; and U. pudiiiix (Smith), olV .Marion
Island, in l,.'>7o fatli(nus.

PAK'AMUSIUM Vt>fnll, 1897.
I'liiiiiniisiiiDi \KHiai.i.. rr;ni>. Cuiir,. Aiad., .\, pp. 72. 1M>. '.I'J, 1H!)7.

'/'///«'. — PdniiiiK.siiiiii thilli (Smith).'

Shell thin, roiinded, much eonii)resse(l: valves nearly equal; sculp
ture Ui'aily ol>Noh'te, dilferent on the two valves; the lower vahe with
eoiu'cntric undnlafions. Aui'icles \«'ry snndl, e(|ual. Uyssal notch and

1'. iliilli raiiuis t'nmi tln^ (oilf af Mcxicii to I'.arltailus. in 21S to 1,.">'J1 futlioiim.

\

«.,■*•
1

!i

1

Nil. II. ■111.

i>Fj:r-n A ri.u Moj.r.rs(A~]-i:i!i!ii.L .ixn nu.sji.

S.-^S

|)0<'tilii(liul fct'tli obsolete. Tlie sliell lius ii ]»ii,siii;itie s| iiietuit'. Iiitcr-
iiiil lii'je iiiid aiirieiiliir <Turie \vell<Ie\("l(»pe(l.

'I'lie struelure (tf the iiiiiinal was descrilxMl by Mr. Dull as \(>i\ dif-
ferent iVoiii that of rypical .h//».s//////. Acfordinii tn his description it
lias ii single pair of jiills, with Ioii<;-. siinplc, scpaiale lilaiiieiils. 'fhe
fool is sh'iider, with ji byssal jiroove: tlie end is iniicli enlai.yed. with
an obli(|iie, exjjanded, concave terminal disk, striati'd within. N(»
hibia! i)alpi. OceHi without pij^inent.

A specimen, well preserved in alcohol, exandncd by us, had ! w u lows
of lonj;', slender, retlected uill-lilameniN, as usual in this lanuly. They
were attached to a broad basal mend)raiie, with a free, limcolate. pos-
terior portion. Two pairs of 1)road, luliaceous, incnived palpi, linked
with dark biown. Those of the anterior \nu\ aie united into a hood
over the mouth; the otlun'S are smaller, curved inward, somewhat lan-
ceolate at the tips. No ocelli coidd lie found. The jiallial tentacles are
all in one row, numerous, <d" various sizes: from four to si.\ larue ((ues,
with as many alternatinj;' small ones, correspond to each larger undu-
lation or scallop of the inantle-nmrfiin. Xo yuard tentacles. Muscular
pallial border is broad, thickened, radially stiiated. forndn<;- a lidnc,
as i)reservcd, but m)t tentaculated. I'ree portion of rectum loni; ami
slender.

A .syno])sis of th(} iV^ctinid.e was recently published by l)r. I'rcderico
Sacco.'

He recognized three, <;enera : ChUvmjix. Amiissiinn, and I'rilnt. with the
same types oiven by Verrill. I'nder ('hlinuj/s he giv<'S nine subj^cnera.
Of these, I'our — r///((/Mj/,s' (restricted), lliniiitix, .h'tjidpt elm, nui] I'aH'io-
hnn — cori'cspond with the j^roups of the same name liiveii by Nerrill;
Friipc.s Locard (type, prsj'clis L.), I'cplum Buc(|Uoy, l)ant/.enl»er,<;. and
DoUfus, 1889 (type, inji'xum Poll), MavroclKilmix Sacco, 1S!>7 (tyi»e, lat'iN-
siiiKi IJrocchi), FIcroitccHn Sacco, 1897 (type, //r,///o.s/(.s' I'oli), Lissoclihinii.s
Sacco, 1897 (type, ^'.rc/.sv( l>ronn), are additional to those <j;ivcnby N'eriill.

Under ^l/«M.s',s'Mr»i he has, besides the typical yrou[), tour suhi;t'nera.
Of these, two are new — l*ar ram nasi u»t Sacco, 1897 (tyi)e, (luotleciuihain I-
Utfum lirouii), Varinmii.sxium Sacco, 1897 (typi', cnncrlhilinn Si^hnddt).
The two others are I'ropeainiiNsiuin and I'.s( ii(}<iini(s.siinn.

The three new subgenei'a of rrrttn are Aiiiussioixricn Sacco, 1897
{ty \)V, hurdii/alriisiN Lauuirck); Oopvcten Sacco, 1897 (type, ntfiniddfus
Lanuirck); and Fluhclliprrtcn Sacco, 1897 {ty\H'', Jhihi'lll/'onnis Iboechi).

' Holletiin) ilci Mum. Zool. od Aniit. ( 'oiiip..
iijipanMitiy issiuMl nt alioiit tlio saiiir liiiit^
ahstriittfil.

i'roc. 2s'. .M. vol. XX ~y<i

'iii\ . (li 'rnrinii. Ml, p. Idl . Ii \v;is
a.s ilial 1)\ I'rul'is.Mii- \t'riill. Iii'it)

H

I

s:vt

rni>('i:i:i>i\r,s or riw xtrroxtL }frsi:r)f.

VOL. XX.

CHLAMYS BENEDICTI Verrill and Bush.
,Pl;iIr L.\.\\I\ . liKS, ],'2.)

CliUntnin 111 iiiili' li \ i;i;i;ii t. mill llr-ii. in \' i Kiii i.r . rriiii^;. < 'iniii. Ar;iil.. \. ii|i. 71,
;M, iSiiT.

Shell .siiiall. lii,i;lici' tliaii Imi;!;"; ;iiil» rior uiiriclc iiiiicli liirj;ri- tliaii tlu'
posterior, witli a <le('|> l)ys.siil iioteli in the lower or ri;;hl viilxe. 'I'hc
<loi sal iii;iruiii is sti'aiii'ht ami la it sli^ihOy oblifpie: t he |»osleiiof auricle
ill the ri.uht \al\c is decidedly aiij;iilar, witli its outer end sliylitly
in(Mir\('d and seriated l>y the teriniiiation ol' tlie radial ribs: tin' ante
rior auricle is c<)iisi(leral)ly prolonitcd. anj,nilated at I lu' upper comer,
obtusely rcamded at tlie end and deeply iiotclied wliere it joins the
main shell: it has four strongly marked radiating ribs, iiesides (he
dorso marginal Ibid; below llies«' tlii-re is a s]ij;litly concave space eor
respondiiii:' to tlie l>yssal notch: on the liody of tlie shell there are
iVoiii lour to seven sharp serrations aloiiu IIm^ lower margin of the
notch. Ill the upper valve the anterior auricle is broad and decidedly
;infiular. the dorsal ami outer mar.uins fonniiij.;' less than a rinht auulc;
its surface is eoNered with li\(' or six sti'<tiiL; radiating' rii»s deciissaletl
l)y more nuiueroiis. liner, concentric raised lines. The anterior a!iil
l)osierioi- mai'.uins ol' the body ol the shell >lope ab(»iit etpially and (briii
an acute aii.uli': the ventral iimi'.iiin forms a leiiulai' semicircular cur\e.
Tlu' entire surface in both valves is crossed by stroiiuly raised, ratlici
close, radiating' ribs separated by latliei' wide, deep y'rooves and are
decussated by rejiulai'. raised, concent ric lines, which are scarcely appai
cut on the ribs, except on vei'y yoiiiij;' shells, but there are latlici
strong;', elevated, spine-like iioiiits arranu'ed aloni:' the ribs in prcti\
reuulai', coiuentric lines, especially near the marjiins; these itecoiiir
lii<ihei and more ])ointed anteriorly and are freipiently nearly obsolete
in the ii'iddle portion of the lower \al\«': the ribs project at the iiiir-
gin as blunt ])oints or serrations; cm the inner surface there are laiiial
grooves corresponding to the external I'ibs. The hiiige-margin is tdiii.
with a slender ligameiital, submargimil groove and a small, tiiangiilar
resilial pit in the center. The coloi' is variable; the siiigh> valve I'loiii
station 1*571 is unilbrm lemon yellow: those from the otiiei' localitv are
ehestnut or reddish brown and variegated with paler and soiiHinnes
white blotches.

Length of the largest specimen, ."i.o mm.; Iwiglit, »> mm.; leiiLiili of
doi'sal margin, I mm.

A few live young specimens, among l''oraminifera, .stations I'-iti'.' to
2."i7-l, in L*r» to L'T fathoms, and a single valve, station ifo'l, in I. •>">'>
fathoms, ISS.'t.

This species is ii typical ChUnni/N, allied to C. rnria of iCuropc, but
when t omparod with young of that species of the same size the radial
ribs are found to be fewer and coa.rser. and there are other dilit leiiceH
which r<'nde!' it piobably that they are distinct. It dilVers I'lii I lie
young of ('. islainlicd in the number of ribs and slia[)e of tlit aiiritdes.

«.^

r

NO. li:i!l.

iii:/:i'.ir I ri:i; y<i/ rjs(j—ri:in;ir.r. im> ursii.

S3;

.')

M
\

ic
tc

k

r

It is i)r()l)iil)h', liowever, tlijit it grows t<» ii iiiiifli liiigt'i' si/c ilum an.N
ot" tlic siK'ciiiu'iis obtsiiiH'd.

it is iiiuimmI ill honor ol" 3Ii'. J-iincs V.. Hcucdict. lor sfNcral vcars
/oiilojiist ill cliiirjii' on tlic steiiincr Alhnlross^ tliioiinii w iiosc carr ;iini
jiii'iil interest so iiiiiiiy sinall spftirs urrc hrou^lit to liulil.

CHLAMYS COSTELLATA Vcirill and Bush

(I'lalc I, WW I, li--. (!.)

CliUimiin lonlilliihi Viaaiii.i, iind Hrsn, in \ i;i!iai.i.. Tunis, ('uim. A( ••hI., N . |i|.. T.".,
ill, 18!t7.

Slicll small, tliiii. transliiconr. blnish white, covered on hotli viihcs
witii cuiitiniioiis, elevat<'(l and soiiiewliat tliickeni'd. well-separated,
riidi!itiii.u' riltlets, of wliicli tiiere are more than thirty in the lett valve
of tlie larp'st example. lAMi^th (d" the sludl eoiisi«lerahly less tiian its
heijiht. Dorsal hin^e-inaryin (donjiated. especially on tiie anteiior end.
In the rijilit valve the anterior auricle is consideraldy elongated,
obtusely rounded or suUt runeated at the end, with a wide, an^idar
byssal noteli beneath it,ha\ino- two or three ))eetiiiidial teeth; it has
a broad, smooth, anj^ular area ne.xt the body of the sliell, abo\-e wiiieli
there ai'e three well-marked, aiifjiilar, ladial ridj-es, separated by wider
eonea\<' interspaces; theimsterior aiiriide is small, triani^ular. the outer
corner formiiifi^ a little more than a rij^lit anjile. and the p(»steriui mar-
,i;in iK'arly straight, without any distinct notch. The dorsal mariiinsnf
the l>o<ly uf the shell are nearly straijiht and diverj^e at less ilian a
rijilit an.i^le: the \entral mar.uin is i)retty evenly rounded, a little
]»ro<luc«'(l in the middh\ The beak is small, acute, ajjpressed, and does
not project beyond the marjiin. The radial ribsaic very distinct, elean
cut, thickened, rounded at the sumndt. separated by nearly smooth
intervals, two (»r threes times as broad as the rit»s themselves: the ribs
increase rejiularly in width from near the umbo to the maij.rin; a few
intermediate ritlges comnu'iice near the nuirj;in. The left \al\(' is
badly broken: it is, however, somewhat more convex than the oilier,
and tlh' I'adial ribs are crossed by nunn'rous concentric striations yiviu};'
tlu'iii a liiudy crenulated or beaded appearance: the aiitciior auricle is
broad, trianj^ular, the outer end slij^litly roiinde<l, with a slif>hl incurved
notch below; it is crossed by about six small, radial ribs, similar to
those on the body of the shell; raised lines of jiiowth also occur at
irii'iiular intervals. Inner surfa(!e smooth and lustrous. sliowin<: the
grooves correspondin<i' to the external ribs and also a very distinct
microscoi>ic structure, but it is destituti' (d' radial hr.e. Internally, the
hiii<;('-mai'!nin is thin and narrow, with a sharjily imjtressed, sul>!iiar-
ginal groove on each side; the resilial pit is excavated in the margin
of the hinge itself: the anteriiu- auricle has int<'rnal grooves coitcs) rind-
ing to the external ribs.

Length ui' the largest specimen, <> mm.: height, it,~> mm.

Tlii'ce live specimens, at two stations, olf the (irand r>anks. in (17 to
72 fathoms, 188.J-8G.

lil

83r;

ri:oti:i:iu\(;s or riii: smiosm. miseim.

Viit. XX.

HYALOPECTEN DILECTUS Vcrrill ami Bush.

( I'liiti' \CVII, lin.!l.')
Ililiil<>iif<ti II ilihiliiK \ I'.uiiii.i, ^iml l!i->ii. ill N'l'iuiit.i,, ri'iiii>. < 'oiiii. AcMil., \, )i)i,

SIm'II siiiiill, lliiii. iVaj^ilf, stronj-ly iiiKliilatcd, sli^-litlv ohliijiu', with
(lie \»'iiti;il iiiiii'uin hroiully roiiiHlcd, dorsal marjiin slruijilit. In tin*
liulit \iil\f till- iiiitt'rim' auricle is ratlicr narrow, (don,nat»'d. witii a
deep anji'idar notcii beneatli; (lie posterior auricle is sliortcr. with a
prominent doisal anjile which is less than a lij^ht anjjle. owinj;' to tini
cnnir.uination ol' the posterior end. In the left valve the anterior auri
cle is Itroad. wiili its posterior end nearly rectilinear, and forms a ri;;lit
allele with the dorsal margin; the posteri<tr auricle has a slightly
jMoinincnt dorsal aiijile ami posterior enuirj^iiuition as in theri<;ht valve.
The heaks ar«' a little pronuuent and project somewhat above the dor-
sal mari^in. more in the ui)per or U'ft valve. Tlu' surtac*' in both vahcs
isco\('red with broad and rather regular undulations, which are most
prominent in tlie left \al\'e, and are crossed by rej;ular, well spaced,
thin. laistMl. ladial lines, which become line and more i-rowded at the
ends of the valve; they are nearly obsolete \\\ the x\\f\\\ valve, beiii'-'
repr«'sented by micioscopic stria-. In both valves the anterioi- auricle
is markid ^\< several fine, roujih, radial rid<>es which are stronger and
more numerous in the lelt valve. The interi(U' is strongly undulated,
and the lett \alve is marked by distinct, radial grooves. Kesilium
small, (-entral. Color yellow, or dirty white.

Len.uth, S mm.: heiyht, the same.

One live, impel feet specinu'u (Ko. .jL'oiJ!)), station L'oTO. off Marl has
\ i^ieyaid. in l.Sl.) fathoms, ISS.'i.

This <necii's is closely allied to /fi/olopecteii frdtjilh (.lelVreysj and
resembles very nearly his lifjure,' which probably represents a species
distim-t from the ori;.>im«l type described by him, and may be identical
with oui' sliell. The latter dilVers decidt'dly from the ori<;imd descrip
ticHi of //. l'i-n(iUis. Moreover, we have obtaiiu'd from several stations
a shell of similar size which appears to be the true _//v(/////.v,' as it a,yrees
closely with 1 he description. Uj/Kloitccfcii />»f//c*/.s' (Suutli) from east of
Marion Island, in 1,.'{7."» fathoms, is a closely related species, as is also
Ilj/ttli)jn(irii iniddlKs Vcrrill.

These four species a^ree in havino' the valves thin an<l ti'anslucent
ami sculptured with distinct c(uu'entric umlulations, while the radial
sculpture does not form stronjj' ribs. They seem to be related to the
j>enus or subjicnus Si/iirycloiicma INIeek, which was based on a cix'ta-
i'cous sjiecies and has not hitherto been reported as still livinj-'. Mat
theexact characters of the typical fossil species are not yet known.

' I'rnc. /oiil. Soc. Loiulon. pi. \l.v, lig. 1, .liiiio. 1S7!(.
The I rill' lliiiilopcrli II I'raij'ilix (,lcll'i'c,\s) was takt'ii :it tivn stations Ix'twccn N. lat.
Id (; . W . loiij;. t;s I 'My ,:iml N. lat.3:> l!> ;{()", W. long. 71 :il IT. , in 578 to l,r.jr>
lat bonis. ]"8a-18><(i.

I

(Kj'S

T

f

NO. 113it.

i)i:i:i'-}y.\ri:i: moli.i sr.t- i i:i;i:iij. am, itisii.

83:

CAMPTONKCTKS GRCENLANDICA , Sowrrby i Vt-rrill.

(I'lMlr L.W.W . li«. 7.)

P(r<<// /yr(i»(/flH(/i'»/» Sowi :i{m , TliisMiiniH ' (mcli.N liornin. I't.ii,)>. nv.pl. \iii, lijf.

1(1, IHI'J. - Il.\vi.i:v. l.'.( iiil SliilU. p. L'Tl, IML* In is.-.d.— .1 ki i iji;\ >, Ann. mimI

M.iji. Nal. lli^lnrv. )>. L':;i. IS77.
I'iclfli iiiiiiiUlUiliiiin (i. (). SaI!S, Mull. licj;. .\l<l. Nol'Vc;^., |i. L'!!, |il. J. liii^. |,

a-i , 1H7S.
I'ecleii firii iildiiiliriis ,Ii;ki'I!I.Y>, I'nic. Zinll. .*>«)i-. Lonilitn. p. ."••id, IsT'.t. — \'i;i;i:il,l.,

Clifck-list, i». M, \H1\K
I'lrldi tjviiiihindiciiH \'i:i!i!ii.i., 'i'liins. ('nini. Acini., \', p. ."si, Issi.'.
I'viliii lira iiliuxliiHx l.oc.MJD, ('.imp.iniir (III I'aiithui, .Viiniilis do I'l niMisiti dr

Lv<>n. p. 217, \XW>.
( (tiniihiiiiilcH i/ro iihinilicii \'i:i;itii,i,, 'rriiiis. Conn. .\('ail., \. ]>]>. si'. ;il. I>ii7.

Tlu' .slicll is r(nm(l«'<l. incqniviilvi'd, very tliiii. li\ ulinc. ncjirly siiiootli,
ofti'ii with ii violft iridescence wiieii IVesli. Tlie left valve i.s cdvered,
even iVoiii tlie niKdeus. with line iniero.scopie caniptoneetes .seid|itnre. iu
the loiin of tliin, raised, discr^ent iil)lets, more or h'ss ii reunhii an<l
\va\ y, most visible by transbieeney. Tlie h'ft val\ »• soun-tinies lias. also,
line railial stria- and delicate lines of ^lowlh. The mar.<iins ate lliiii and
smooth, tiiat (»r tlie rij-ht vahe turns up a little ajiainst the other, whicli
is larfi'er. and Hie valves close \ery tiyhtly, so that anterior!\ theic is
scarcely any visible yape, even nt the byssal not<h or at tlie end of ilie
auricle. The byssal notch is well-marked and the pectiiiidial tcetli are
small and few. The byssiis is i)robably very slender. The auricles are
not obli(|ue and are nearly equal. The hiti}i<'i»late is ver,\' thin : the
siiij;le loiiiiitiidinal lidjie is scarcely visible.

A row of six or seven ocelli ean be seen through the shell in alcolntlic
speeimens.

A f«'W live speeimens were «lre(l<;ed by the Ignited States I'Msii Com
mission at four stations, olf Newlbundland Hanks, in i;>(Mo L'2I fallionis,
between N. lat. il^' K)', W. long'. 17 ;>.")' ;J(» ", and N. hit. II 1(1 ;;(•".
W. long. .V.r .V)' 4")", 18SI-18.S(;. It is also known from the Arctie
Ocean and oiY northern lOurope.

il

H

«. 'S

CYCLOPECTEN NANUS Verrill and Bush.

(I'liltr 1,.\X.W, li^s. L'-l.)

('jlilnpcil,,! uiiKHs \i;nu!i.i. aiK. r.rsir. in \r,itiai.i . Tians. ( '<inn. .\im(1.. \. pj). s.">.
Id', pi. x\ I. iif;s. I-J-r_»c, lS!t7.

Shell small, the breadth and height about i'qual. the \alves nearly
equal in size and coiucxity. Dorsal hinge-margin rather long ami
straight; auricles r(datively large and broad, both ends in the left vahe
sid)truncated or a little convex and forming nearly a light angle with
th(! dorsal margin, ami ha\iiig a small incurved not(di. well dilferen
tiated from the body of the shell. In the right valve the anterior
auricle is narrow, somewhat more elongated, obtiisel.y rounded at the

i \

«3S

ri:i>(i:i i>/\(is nr mi: \ irf<>\.ii. ur.v/r.u.

VI It.. XX.

ciid, witli ;i sli:n|i, iiii^iiliir, liyssiil iiotrli 1i(>iu':itli it, scpai :itf<l liuiii \\n>
lioily oT the slicll li\ ii iKiri i»\v ^icuiN c. TluMlorsiil in!ir;;iiis of I In- hody
of tlu' slifll ;iit' iiciirly striii;:lil ;iii<l tonii iii(»r«' tliiiii ;i liyiit ;iii;;lt'; llif
vciiiiiil iiiiiruiii is hnnKlIy ioiiii(U'(l, nciiilN Nt'iiiicii'«iiliir. lunniii^' a vt'iy
olttiisrly roiindcd aii;;I«', wImmc it joins tlic dnisal iiiarj;iiis. C^niliosa
littl(> proMiiiiciit. witli a sniali, sinnoth, latlin' aciitc, itu-iiiNcd Weak,
wliicli piojccts a little aboNc I lie liiiim' iiiiii';;iii. Tlui rturl'iico (d' tlu' Icit
vsilv*' is ('\ ciywiivic t liiclily cov crctl witli line, almost micioscopic, radia-
tin;;' si ria'. whicli hrcniiic a little more distinct on tlie ant»'ii(»i' auricle;
sli<;litly raised lliin lines id" jurowili are »d'len wvy <listinct on some
parts of tlie siiell, especially on t lie antei ior aniiele, w here tliey become
i'loser. inoie re^nlar, and (d'ten pi'odiie«'. in crossinj^' the radial striations,
a quite lei^nlai', ndei'osco|»ie decnssjitiou; thoseulpt ure on t he posterior
auricle is sometimes siiidlar i»nl liner, althonjih in nniny speeinicns the
Mirl'ace is nearly smooth <tr marked only by very tine radial stria-. The
1 ii;lil valve is less convex than tin' let! (its \-entral edj;(^ does not (|ni!(^
I'cach t lial of t he opposite^ n ah e). the und>o is less piom incut, t he beak
less acute, and scar<'ely i)roJects beyoml. and olten tails short ol. *^l,e
hin;;('-mal'^in : the iuetpiality is less marked than in most (d' t he allied
species. The bo<ly of the shtdl in this val\u is Hinooth, except lor \ery
fine. irre};uhir lines of .growth ; (Ui the anterior auricle there are from
three to six, or nutre, distinct radial ridges, rouj;hcued by conspicuous
lines of yi'owth : the marjiin below the byssal uotidi is entire, withoiil
pectiiiidial teeth: the posteiior auricde is uearl.\' suu>(>tli. The internal
hin;je plate is thin in the middle, but ivlatively broad on each auricle,
and is crossed by numerous line, well-marked, transNcise striatioii.>.
these aie mucli moie consi)icuoiis than in any (d' the ridated spei !'s,
whether youii}^' oi' old. The lesilial pit '.■; small, rounded, situated just
under tlM^ beak. The inner surfact^ issmooth and j;lossy. although in
fi'csh s|ieciiiieiis the external •liidiutini: lines sin »\v throu,iih by transpar
ency. There are no internal liiie.

The ground I'olor of the ri.<;ht valve is yellowish or inrayish white,
with more (U' less numerous lij;ht yellowish brown and reddish brown
spotsor l>l(»t(du's, and soinet imes with irri uiilar patches of op;i(|ne white:
the ii<;ht vahe is white, sometimes with a few ..Xilowish brown spots.
Solium specimens are nearly destitute ot" spots.

Len-ith of one of tlu^ larjicst si)eeiuuMis, 7 mm.: heijiht. <> 'miii.: dor-
sal hiuiic iiiaryiii. I mm.

It has been taken in consideial)!e numbers, ^ .. dead, at three

stations between \. lat.;??"^ 7' iU", W. lonj;-. 7i iO",an(l N. r.-'Jo^

•tL', \V. Ion-. 71 or ;}(!", in I.", to 131' fathoms, b

AltluMijuh very snnill, this species .seems to be adult, .i is so distinct
from all ofhei- species of our coast that a detailed comparison isuiuieiv
e.-ssai'y. it resembles the yoiiiiL;' of I', rliiitint'iis nu>re tluiu any other
native species, but a comparison of specimens of the same si/.e shows
nuuketl (lill'erences.

I

K'T

NIP. lira.

in:i:i'-\y\ri:i; \ini.i.rsi .i-\ i:i;ini.i. .i\i> in sii.

s:\\)

*r

CYCLOPKCTEN LKPTALEUS Vcrrill.

ll'hllr I. .WW. li-. I.I

I'lilvH Irpliiliiin \ l.iiiiil.l., Tunis, ('(iiiii. .\(Mil.. \ , |i|i. 'S.'t'J, L'>1, \SX2- lOxpl. lllm-
IroMn, l.'«|i(H't I'.S. Com. FInIi ami lisln'riiM I'nr |nx;i, p. Ti'l. lSS."i. Iiai.i,,
I'.iill. .Mil-. Comp. Zoill., Ml. |.. L'L'i, JSNI.

I'hi iiilnniiiHiiim lijtiiilnit K.vi.i., Hull. 1'. S. Nat. Miih., Ni>. :!7, p. ;!|, IsM'.t.

(Uiiliilifiliii li'fttiih IIS \i itiMi.i., 'I'nin.s. CiMin. Acini.. \, jtp. s.'>. Cl', IS'.iT.

Mr. Dull li;i-^ cxprcKscd it (loiiltl ;is t<> lliis species bein^ disiincf,
I'lulii I'nini iiilliril'ir liMVelU llierelnre ii \eiy miieli eiii;ii;,fe(l liLjiiie ot

llic sliejl is Ihtc introduced lor coiiipai'isdn.

ill iiddJtioii fo llie j)iil>li.^lied deseriptioii, it slioiild be stilled tlnil the
eoiiceiidic IIim's are soiiiewliat tliickeiied and elevated, e\»n w lieio
tliiiiiiesi. and tliat the headed eharaeter is (ptile miliUe aiiytiiini; I'oiind
oil ('. iiiiliril'n\ or allied spetue.s. Tiie heads are closely arraii;;('d,
i'lliptieal in loiiii, and most elevated al llie center, tlu^ elevation l>ein;^-
ot'ten jfreater than tlie <lia meter ; the summit issiiiootli a. id i;lass\ , sn that
w lien vit'wod from aliove. umh'r a lens, they often appear to lia\-e a ecu
tial ea\ity. 'i'lie radial lines are comparatively Ncry thin and delicate,
and not visihie, except wlu'ii coiisidei aldy magnified. The heaUs are
more acute than in C iinlni/'ir, uud die nucleus smaller and smoother.

Two live specimens, station lilO'i. off Caiie ilatteras. North Carolina,
in ML' fathoms, iss;j.

^4

CYCl.OFECTEN PUSTULOSUS Verrill.

(I'l;ilr I.W.W . li^s. .-., ti, 1(1, 11.)

J'icliH iiiiKtiiliiHiiM \'ii:i<ii,i,. AiiMM. .Iiiiiiii. .Scii'iKc, \, p. II, |S7:!; Tiaii.s. ( unii.

Aca.l., 111. p. .".II, 1S7I.
I'lrliti htisLjiiisi \ar. ini.tliilomin N'laa.'ii.i.. Tiaiis. Ciinii. Ai'.ail.. \ , )k .")S1. pj. \i.it.

tiffS. L'l'. L'L'd, IS.sU I not III. \i.i\, lit;. III. .Nut I'lilfii Imshiiiini ti . O. Sai;-.
I'lcliH jiiistiihiNiiH \'i:Kiai.i.. Trans. Conn, .\rail.. \ 1. p. '.'nl i p. 'is\ in [iMii ', lss|;

I'.vpl. .llhtilrosK, 1,'i'port I'.S. Com. I'isli ami I'isliciifs loi Iss;;. ji, "..".T in

jiail ), 111. \\\i. tijis. 1 iL'ff. //, ISK").
I'evtiii imhril'ir I )M.i,, l!iill. .Miis. Ciun]). Zonl., X 11, p. I'l'O j in pain, i mil pi. n ,

tifis. \<i. l/'i, isstl: Knll. 1. S. Nat. .Mns.. No. 'M, \>. :;| i in part), pi. i.\i\.

lil^s. I IJ((, //, ISSil (liol pi. 1\. liii.s. I((, I/),. Not I'eihii iiiihril'cr l.dNi'.N.
Cililiijiictiii (HI M I II I on II n \'i:aKil,i, Tians. ('<iiiu. Acad.. X, jiji. 70, M!, !IL'. pi. \i\.

li^s. :!, 1, I--..;.

This species lias heen refi' red to J'ri'pfidiin.siinn hoshi/nsi hy def-
freys, and to I'cctcn {('i/clo/xclcii) iinhrij'cr hy Dall. It never has the
internal ribs, like the former, wliieli it resemliles in sculpture, from
tli«' lattei', as ori.uiiially de.scrihed hy liO\<'n, and redesciihed and
lijiured hy (I. (). Sars, it: litfers esjiecially in the character of the orna-
meiitiition of the left viihe. The Scandiiia\iaii form, accordiim to
these authors, lias ilie vx'sieles miK-li less crowtled in each radial row
;iud siihcoiiical and miierouute in form; while in ours they arc usually

HAi)

ri!(>ri:i:iu\(is <n' iiii: x.irntx.ii. mi s/:i m.

Vnl.. XX.

closely crowded, nf'ten cxni in coiilju't in tlic liidiiil n)\vs, and in
foini citli*-!- roiintU'd oi ellipticiii witii tlit* lon<^'<'st diaMictcr in tlM>
tlir«'cli(tn <•!' (in; cunccnl lie lines, with llie summit eveidy lonnded,
showing no tendeney lo the .siilieonieal or mneronate lorm. \\ hen
perl'eet (liey resemble small hlisters with the surlae.o i'ou;;hened or
iiiinutely ;;rannlose under the miei'oseope: when brcdveu uv worn olV, as
IVequently happens, t he liasal part remains in the Icuiu of a siMuieireiilar
oi' seiniellipt ieal, ind»rieated, arehed scale, usually considerably ele
vated abo\e the siirl'ace and connej-ted by very delicate concentric
raised lines. The surface of the anterior auricle ol" the left \alveis
roujihencf! by close, elevated, (•ollceu^ric linos, and Irom four to six
well ma: ked radiatiu;^' ridj;es or ribs, ujxm which the concentric lines
form rej^ulai' ele\ ated arehed projections, (dten so crowded as to be
ind)ricated : in some youn;.; examples, like the oim' li]uiired, the coiu'cn
trie lines on t he auricle are less crowded aiul only t wo (»r t iiree ol the
radial rilis arc (b\eIopctl; in such examples tluMOsicles »ui the body
of the shell ate relatively jewel'. Iaij;'er. more rouiuled, and nunli less
crowded in the radial series. In s(tme spe«imens I he posterior mar;iin,
below the auricle, is nearly sm(»otli or marked only by the line lines of
g'rowth, while in other-^. especially lari^cr specimens, this rej^ioii is cov
ered by rather sharp iiianules, .sonu' of whi»di. toward the sciitral
niarjjin. chan;;c to p(»inted scales arranj>ed in crowded radial rows.
The raised concentric lines (»n tne ri;.;lit VJilve are j;eu»'rally more or
less appressed and sonu'times induiitaled ; toward the xcntral margin
.some of them sli<»w \ery tine juicroscopic crenulations. which are much
less distinct than on ('. iinhrif'rr. as liiiured by Sars.

This species is distinct from that lijiiired by Mr. Dall' under the
iismu' of <'. iiiihrih I-. His specimen apparently b«don^s to the follow
inu species.

SoNcral li\e and dead speeinu'us. at eleven stations betwi'en N. hit.
11 .tr, VV. Ion.;;-. Mi 11' lo". and N. hit. :'.'.»' 4S' ;',0". W. huij;-. 70 o 1 ,
in 1t!».i to AIT fathoms, isTi'-lSSo.

I

CYCLOPECTKN SUBIMBRIKKR Verrill ami Hush.

d'l.it.' i,.\\\\ , tiys. H, il. 1
/'<(■/(// /(OS /,(/;/ .si \ I'llUMI.I.. Tr.lllS. ( (III II. .\ii|<l., \ . p. ."(Sl. |il, \I,1\ , lifT. i 1, ISSli. .\<il

I'orlics.
I'irlrii [ !'■•« iiilamiiMiiitii^ tmhril'ir ll.Mi. Itiill. Mum. Coiiip. '/.oi'A., \II. |i. L'L'O liii

liait I. pi. 1\ , li^H. I((, 1*<. I^SH; Hull. r. S. \al, Miih., .No. ;{?, p. :tl i in p.ii'l i, pi.

i\, lij:s. l-(, \l>. ISSJI.
i'llilitftfcli u Kdliiiiihri/if \ latiui.i, ;iii<l llrsii, in \'i;uiiii.i.. Timiih. Conn. ,\(itcl., X,

pp. s|.;ii.'. is;i7.

Shell small. iiie(|uival\ ed. while or .urayish white, translucent. lciii;lli
and liciuht nearly e<|ual. horsal inarj;in sli'ai^lit. Aiit«'rior auricle in
the left \al\e rather larj«e and broad, thocuitor end obtusely rounded,

Ithllvr .MmIIii-im, pi. |\ , li;;N. Id, I//.

NO. ii::!i.

Drii'-WM Fi: Mo/j.rsc.i ^ i i:i:i;iii. t\i> /;/■>■//.

S41

r

covi'ird willi siimll. I'Idsr, iiidial lilis :iii<i ri.iwdi'd coiHTiidii' riducs;
IMislnior Miii'icic iiiiicli sin:dl*'i', w itii iVoiii olio to tlirct- I'liinl. rndiiil
ridm's Mild m;iii\' cMiicfiil ric. raist'd lines, and willi its oultr cud ruriii
inj; It'ss tliaii a ri<;lit aii.ulc. w itii ji .sli<,dil inciiixcd iiotcli hclow . In
til*' li.ulit Nidvc tin- anterior auricle lias a similar radial sculpliii c and
tlie l)\ssal notch is rather deep and narrow. Tiie dorsal lines of the
Itody of the shell I'oriii rather less than a ri.uht alible; the ventral iiiai
^iii t'oiins iieail\' a semicircle with an olitiisi^ an.i;le where if meets i he
d(»isal outline. I initos a little jnoiii incut ; beaks small, acute, smooth,
and project in;; Ix'vond the maruin of the hiii^ic The siirfac(^ id" fin*
left \alve is coverwl with slightly raised coiiceiitric lines, which are
interiiipted or hridien up Ity small arched scales wliicii ai'e sometimes
somieirciilar. l»iit inoi'e fre(|iieiitly somewhat aiiunlatcd or V shaped,
and iisiiall.x are separated by intervals about equal to their l.rea<llli:
these scales \aiy in number, luil aro usnalls arranged in about loity
radial rows, and increase i'e.i;ularly in si/e tVom the iimlxis. where they
are replaced l»y thin, sli^ihtly raised, radial lines (uossin^- ihc stronger.
mole elevated, concentric lines, but not risinj"' into point.-. In some
speciuiens the radial arraiiucmeiit is scai'cely discernible; the scales
appear as irreoiilaiities in the concentric lines. The postero (loisal
area below the auricle is nearly smooth, e\('e])t for the line lines of
;;iov»tli, but sometiiiH'S shows minute ;;raiiules, 'I'he riuhl \al\e. which
is smaller than the lett, is covered by tine, thin, close, concentric,
raised lim\s, which sometimes show microseoide striations. The ante-
lior aiirich^ is decussated by from six to <'i,iiht, or more, small radial
rid^ics. which are ei'os.sed by llu^ raised, coinciitric lines: the latter ris(>
into sharp s<'ales at the doisal n\iir<;iii: the small ]»osteiior auricle has
liner concentric lines and only twn or three fjiiiit. radi il iid;;es.

<'oinparatively few specimens, at three stations, between N. hit. I'J'^
I.-.' ;{»»', W. loii;^-. <'- I '•', and X. hit. .!!» ."■.;!' .!(»'. W. h.ni:. 71 I;; .;(»",
in rJl to ol'J fathoms, iSTT-ls.S,").

('. 1,1 nii(((lir(iisi.s iSmith), from north (d" Kerniadee islands, in ti(Kt
fathoms, is a rehited speeies.

PR0IM-:AMUSIUM THALASSINUM Oall. V.riill.

I I'l.ii. lA.x.w II. li-. i;.)

.liiiiiHHiinii I'fiivxtnilinii \' I'.liuii i., I r.iiis. ( imii. .\i';iil,, \ . j». .">SL', ISM'J.

.Imiisniiiiii s|i. \ I a! in I I . Tniiis. ('(nii. .\<mi1 . \ I. I'li. J(il, L'st. issl.

I'll ten ( /'>('»(/wmi/-M'(/;ii ) tlniliixsiiiiis l».\i.i.. Mull. Mie-. ( (iiii|i. /in'il.. \ll. |i."Jl.'t. iSSi'i;

Mull. r. s. Nut. MiiH.. \<..:!7. i>.:!i. ishh.

I'l'Diiriiniiitiinii llitiliiniiiiiiim N'i'.liKll.l.. 'l'rnii>. ( (inn. \i;iii.. \ , jiji. s7, !'L', |il. \i\,
li-iH. .'.-7. ls<t7.

I'oiind at thirteen stations, between N. hit. I<> .'• .tl) , W . Ioiil;. 70
L';5' r»U", and N. hit. .!:. IL". W . Ion-. 71 :>!' .lO , in 1.'. to .117 fat hours,
IHSO-lHSij. South {it Haibaihts, in L'L' to ;{17 lal horns.- hall.

iiH^...ijuja

sl-J

i'i;<iii:i:hi\>:s or r/u: .v.c/vo.v.)/, \rrsi:f )r.

vol.. XX.

l'}iiiiil\ AIM ID.i:.

i ;ath y a h'( a K..i,<'it,

7'///)^. — lUtthjitircii inctKiiciiloiili s 1 SciHclii .

SIm'II oiildii.u. siiIm>\ iili. (ir Kiiiiiiicil. r;itlur 1 liiii. usually liiitiy rjiii
(•('II.iUmI. willi liiiirv <ii' scaly »'pi<iei mis, more or less I'quilatcral. Im-
<|iM'iiti\' sli^litl> iiin|iiival\ I'fl, witli a slij^ht l)yssa] sinus. Uyssus \fiy
sriiall. Li«:aiii»'iiial area lauci'uiatc, Ioiil;*'!' ansi naciMw ci' hcliind the
Itfaks. witli a sa^iiltatc jtostcrior li^aiucnl. I i iii^«' luarj^'iii Mcail\
straii-lil. usiiall\- narrow ami (mUmiIuIous in tiic niidtllc, willi a scries
oi'sniall. ol>Ii(|Ui'. stiialcd and cicnulatrd icctii <in cacli end, (lu' disial
onis liccondiiu lar.m'r and iiioic oiiliijuc; I liosc of tiie postoiior sciics
usiuilly litni^ci' and more oldiijuc. or divcrffcut. tiian those in liif
antcricM-.

'I'lic aniin.d of /.'. jn it inu-iilo'nh s \ai'. i/rtiinlis, lU'csciA t'd in alroliol. lias
l'>«' niaiuin of tnc inanllr plain uitliout ocelli, with a well-devcloped
niiisrnlar septum. posleiiorl\ : tiie loot lai'ji'c and thick, {i'cnicidatc.
]M)intcd postciioily. witii a strong" hyssal uroox c and a slender, solid,
hyssal stem: t wo ]»aii's <»r rather siiudl, loii.ii", lanceolate palpi; the rec
turn with a tree terminal portion: (wo pairs of ratlmr larji'c jiills, with
the po>tcri(ii' end of the stem free lor some distance, cui'\ed, and
t;iperctl to a point, ami with the rellecte(l p(»rtiou oi'tiie lilamcnt oltlie
sam«' lenjith as the direct; (he lilaineiits are vvvy sleinler. delicate, ami
soft and hiil sl:uhtl.\' at (ached (o each other.

This division, which is jtroliahly of >;eneric \alue. includes a numhci-
oC small and mostly deep water species whltdi ha\e been vai'iously
plai'iMl hy recent autliois. Mr. !•]. A. Smith puts several »d" them in
Sctij>li(ir(ii with a mark ol<louhi. Mi'. Dall ]uits two allied s|)ecies in
(he Jurassic <^cnus .l/(fr>of/r;//,' with which (hey do not seem to amree
veiy closely, ami miMitioiis (he airnii(y of others to linrlxifia.

'i'he last uidiip dili'crs in the stout, rouj;h sliell, strongly .inai)iu.u' ven
(rally for (he hu jic byssus. and in (he chaiairter of the te«'(h and li;;;!
ment. Scdjiliiinti has a thick, st I'oiiyly ribbed, incipiivalvcd shell, a
linn byssus. and con(iuu(Mis. strong, laiice(date liunment. Mdrroilmi
has. on (he postciior hin^cpiate lonji', di\erj;ent lamelhe. nearly paral
lei with (he dorsal margin.

We would refer the followinj;' species to l'n(tlij/(ir<n. — /.'. imlumii

'fill' t \N <> W'l'st Tiiili.'iii s|»('ri(s ilt'scrilird iiy Mr. Dail iis Mairodmi aniicrnhi ami
.1/. sdiiriniiiit, slioiiltl. |it'ili;i|»s, loiin ,i scparati' yi mis, cliai a<(rri/r(l li\ tin' low \i i\
(>lilii|iii'. Niililaiiii ll.ir, |iiisti'ri<ii- tc( lli ami MVcral sinailri , inailx 1 1 aiis\ ithc anldi'ir
uiit's. It may In- <l('sij,fii:i(t'(l as III i:lh<it ca, witli Hi iitlunrn iisjiiriihi a- tlic t\ ]n'.

1 lii'^c arc fliiM'l \ ri'Iatfil in om' ol" t Ih' Moccim lossil s]t{u\fs (I ri<i ml n rsuli n in liiK
wliicli I •i>iia\ c s |ilai 1(1 ill Ills ^;i iiii|i id' •■ ('nriillairt'rt, ' liiit lain w'lilcrs ( Cimr I'i
isi'i'.l, l-'isrlifi, ami «i|lii-rs i liavr taktii lii^ iii>t spticit's (Intiiodoiitn i oT tiial >;riiii|i a>
(lie t\iii' I'f tlic j:;ciiiiH "Citiiilliniii." wliich (litl'ciH in liaviiij; llic aiitfrinr ;>s wi II as
IIh' |his|ci ill! tfilli lotij; and lamt'llitorni ; licinc wo wmiUl assot iato TtTtiaiy siiecicM
liko JlcnlliaiLa inlivniiilviilala with tlio iivin;; th-ep wiitcr Ioiiuh.

1

>

N" li:«'- hEl.r-WM'I'i! MOI l.!'>i(.\~]El:i;ll I. I A 7> /./ n//.

S43

hiitirs I Sciifclii ) ;iii(l its \iiii('t its. (//vu/'//.s \'fi rill. I'n ilt i Ji'Wvoys. si pt< ii
hioilillls S;||'S. rrnnlhltil X'cllill. niliifllldlil 1);|11. tlnin oil" Si. N'illcfllt.

iKiitliWiiid. /•'. ///"'■/V(//.v (( ii'ii\), Arctic Aiiiciicit ;iii(l I'luiopc. I:. Kim
iinilii \ I'll ill and liiisli, ( iiill" <»!' Maiiu'. H, (ihi/ssoniin N'cnill and IJiisli.
<»IV I )rla\vai(' i>ay. /». jminiinHrithi N'cnill. fVnni oil' West Indies, north
ward. I:. iiliiiiiriiilK (Dall), li. poli/riinni I>all . /.'. c/^/' /;rr/(«/.s" (Sinitln,
oil' West Indies, />'. iniiijuist itlptu ;Smitlii. /.', /ihrinssn ! Sniitli i, .\tla nt ic
and racilic. />'. //////^f/^/ i Sniitli ). I'aeilie.

Ill iilliiircti ii.siK riilin\y,\U , :\ii*\ />'. saiirhnita halli.are iVuni the West
Indies, in deej) walei'.

BATHYARCA ABYSSORUIVI. new species.
. I'hil.' I,\\\ 1. liu, !t.

Shell small, short, well ronnded at both ends, swollen. ine(|iiilateral.
sliuht ly (il»ln|ne. with a rather lonu, straight iiinu'' margin. liidMis
lai'.uc, sw(dlen. prominent, ileaks prominent and eiirvcil >tronuly for-
ward, situated considerably in front of the middle. Surface e\ cr^
wliero eo\ ei'cd with nearly eipial. delical*', raise(l. radiatin,n' lines and
small, rather <'\'en. raised lines (d' ;.:ro\\ t h : these together piodnce a
linel\ canceilated ^nrtaee which, when fresh, is co\ered with a thin
Inownish yellow epidermis Idrmiii^' small scalediki' points at the intor-
sectioii (»f till' lines; the surface is also marked with sli^ilil. irrei^nlar,
coiH-eiitrie '..aves or iiiidiiiations.

The anterior margin is shorter than the posterior and torms an
obtuse, rounded an.ule at its jniK-tion with the hini^c margin; ilie \eii
tral niarj4"in is oi)liiiuely <mrved. most prominent behind iheniMldle.
where the curve forms neaily the se«;iuenl <d' a circle: posterior marjiiii
is \ery broadly roiiinled and tbriiis a distinct obtuse aiiji'le where it
joins the dorsal ie.ar.t;iii. The lij:ainental area is laneeolaie. mod-
erately lar^c. decidedly w idei' iiist in front of the beaks. becondiiL; nar
row and pointed posteriorly. Tiie dark lif^ameidal i)atch is .urow
shaped, sit naled l»ehiiid the beaks. The hiii^-e mar.!;in is rather wide
and stronji'. with a small, central edentulous space, mostl.\ beiiind the
beaks. The teeth. whi(di are striated on the sides and crtMiiilaled on
the ed.ne, are eipially and decidedly nblii pie in the two series; the juox-
iiuiil iuies are small and the others increase in si/.e and obliipiiiy to
near the end of the seiit's. where one or two of the oiilermost are
d«'eidcdly smaller and \ery ol»li(|ue. In the larjiest specimen thert; are
about si\ teeth in t he anterior and ei;:lit in the p(»st«Mi(U' series. The
inner siirtaee shows faint r.uiial ;inM)\<'s and ridj,M's, tiiuch coar>er than
the external stiia; there is also a line, imprt-ssetl line, with a linely
creniilattMl edi;e close to the niar;;iii.

Leii^ith of the laifiest specimen. <» mm.: heiuhi. <I.."» nun.: thickness,
A..') mm.; leiiutli of (he hinL:e margin, '>•""• mm.

Three specimens were fuuml at statiiUis L*71.". and JTl I. oil Delaware
JJay, ill l,rtJ.") to l,.s")!t fathoms, isso.

EaKSFaHJ.l-iii!ft'lS"PP'''^^''Wi

sll

I'nociriuM.s OF Till: xatiosm. Mrsi:r.y.

Vdl, \\

'rilis spfcit's is allicil to /.'. iilmiiirnhi l);il!. 'I'lic !iit tcr (lillei's in li;i\
iiiii :i less niiindfd 101111 willi :i loiijicr liiiiinc iii;ir}^iii, inoic (li-liiiiic
tt'i'iiiiiiiil iuiulfs. :iii(i iiiiii-li more luitMcroiis iiiid siiiiiDct' teeth wliicli arc
nearly cunt iniioiis. In our spcciniens of />'. ijUnnmiln of concspondiini'
si/e, tluMc arc altoiit ten Icctliin cacli sci'ics and tlicy aical)()ut one lialf
as lar,ii('. Accord inj;- to Mr. DalTs lij;nres, Mie uud)os oflds species arc
lai'jje!' tiian in tlic more nortlitrn lorni. Imt our specimens ot' Ids species
have tlic iirnhos smaller tlian is in<licatcd by his lij>nr .. The position
ol' the l)caUs and lorin of the liuanicntal area is nearly the same in both
species; bnt the hitter ap])eais to be a little wider in ours and the
ln'aks are a trillc moi'c obliipie. The external sculpture is similar bnt
the ladial lines arc decid«'dly sti'onfiei' and less numerous \u f/hnncniln.
and the si'ulpturc is (piitc ditVer«Mit iu the two vah'cs. while in ours
there is no perc<'ptible dilVci<Mice. />'. inivijuisculpUt (Snuth) is also a
closely allied species which Mr. l>all considers identii-al with ll. ijlomr-
nih(. Mr. Smith's liiiurcs arc »piite dill'erent from tiiose <d' Mr. Dall.
and also from our West Indian specimens of the latter, and still more
dillei'cnt from /.'. <iliiiss<ni(iti.

BATHYARCA PROFUNDICOLA ( Verrill).

1 I'Imi.' i.\.\\ ii:. li-. •_'. )

.lr(<i iirttl'iindiciihi \ I'liKl I.I , I'lMlis. ('oiiii. AiMil., \I, |i. \'.\'.K jii. M.IV, lii^H. LM.

L':!(/. iss.">. - l>.\i I . liiiil. Mii>. Cniiii.. /i),;!.. Ml. |,. L'l:., is8(!.
Mtiiiodoii iinti'iiniliiol(( I>ai.i., liiill. I,', s, Nat. Miis., No. :>?, ii. IJ. pi. \i.\ 1. li;,'H. L';i,
■S.ia. iss'l.

A very few specimens, at three stations, ]>et\veeii N. ii't. MP L'O', \V.
Ion;;. <i»i I, and N.lat.'.T . W . lon.u. 71 ."il. in l,7<tiMo L'.D'JO fathoms,
ISSI and ISS."i, ,\lso anumu l-'orandnifera, station L'.'Wa, N. hit. L'S 51',
VV. loni:-. SS • is . in V.'io fathoms.

BATHYARCA ANOMALA, new species.

ll'llll.' I.\\\ II. li^r. S.)

Sliell snuill. obhui^', ineipiilatt'ral. much swollen with larjce ])rominpnt
umbos, and jioinlcil beaks, curvt tl strongly foiward and cousiderahly
si'parated, owiny to the unusually wide, lanceolate, li^ameidal area,
which is covered behind the Ix'akswith the renuiins of a. daik thick
cned liyanient. Dorsal nmr.uin straight tor nearly its entire length;
anteri(U- and posterior ends broadly and about e(pially rounded, the
posterior a little the im»re swollen behnv and loiiucr; ventral mai'^in
broadly idunded. a little prondnent in the ndddlc. with a sliiiht byssal
indentation in front. Surface everywhere covchmI with line, re;;idar,
raised, radiatin,n lines which are chMMissated by liner lines of growth;
the rathei' thin In own epid«'rmis is scaly or chaiVy on the radii, espe
eially toward the nmriiius, w Iumc it forms nniiiile points. Ilin,i;e niai'yin
considerably thickened, increasing iu stren^'th toward the ends; in the

my-

NO, llilit.

i)i:i:r-\\\i i:i; moi.i.i s< .i- 1 i:i:i;i/.i. i.v/; iiisii.

s4:

middle, wlicii' it is niirrnwcst, if is iiciiily sm(M)tli :iiid ntiiiidcd. with
only sli^iiit iii<li('iiti(»iis dl' (»in' or two tiansvcrsc tcctii on cacli side;
next tlicse tlit'ic arc two oi' tliire soiiK-wliat ol>li!|iic, slii;ii(|y divci'^cnt.
iire;,'ular, loiifiitiidiiial, slij^litly striated and crcniilated folds, sciiaraicii
distally by ratln-r drcii urooxcs m-arly |»aiall«d wiiii the inner niai^in.
'riie iimer edjie of tlie ventral niar.uin is tldn and plain.

Kenj^tli, S..") iiini.; Iieijilit, 7 nun.; tliiekness. <• mm.

( )iie li\in<;' specimen i No. 7 lOSl i was dredged l»y tlic IIikIh \\\ siation
")2. olf Caslies I-ed.ue. in 27 fathoms. !S7I.

As oidy a single specimen has been Ibnnd, it is possildc tiiat it is bnt
an al)noriiial variety, jiltlinn<jli it appears to lia\t' been healthy and
well j;rown in every respect. It is related to /.' iHcliincnloiids ,V\;\\{.\
lA.W II. lif,'. <•), but dilfeis remarkaidy in the character of the hin^^c,
which has the transNcrsc !«M'th scarcely disccrnibh'. and oi»li(|ue. incu
uia»' folds on the distal parts of tiic marj^in. and also in the greater
width ol' the liyaniental ar«'a.

1

Family Id .M( )rsil).i:,

LIIVIOPSIS SULCATA, new species,
il'l.ilcs XCll. liu. L': XCWii-. !•: \( V I. il-. 1. i

Shell \(My (»bli(|nc youiin specimens aic less ohli(|ne and in some
cases ai'c more neaily circnlari. broad ovate, the po>i('i ioi' ventral niar-
juili liinch prodnc'd and obtusely rounded; auricles oidy slightly <lc\cl
(>p»'d. The dorsal mai'jiiin is short and slrai^lit. with a narrow . siimm»i h
area beneath the beaks; the anterior margin is suhtmncate, or very
obtusely rounded: the ventral margin is oblique. l>roadIy rounded,
foi'ininji' an obtusely rounded anylc with the posterior niaiyin, whicli is
stronji'ly sloping and oid.\ a little c(»n\('\. 'i'lie umbos arc small and
somewhat prominent; the b(>aks small, pointed, and curved inward.
The entire surface is coxcrcil with strongly nuirked, concentric i^iooncs
and i»r(iUHnent rouudt'd. naridw ribs; the lattei' are crct-sed by numer
ous line, radiatiui;. incised striations, which divide llieni into beadlike,
or stpmrish, portions, which are most obvious on the middle ami pos
terior parts and become very faint antcrioilv. The liinuf niaruin is
much thickened and bears a curved series of rather laryc, llaitened
teeth, (»f which about eijilit are situated in Inmt of the beaks and ahout
ten behind them; those neaicst the center are small; theresilial pit
extends upward to the ln'ak in the tbini (tl a small lrian,^ular deitrcssion.
The inner surface of the shell is marked by fine, ladiatinj; stria; the
margin is thickened and <'ul avv;iy near the cdjic; no crenulations iiave
lu'cn observed in oui' specimens.

( Ireatest leuiitli. Umm.; jireatest height. I'! mm.: breadth. (1 mm.

A nund»er <»f separate valves, at about ten stations, beiween N. lat.
40 S', \\. lon}>-. (IS ir>', Kud N. lat. ;;7'' 7' 1", W. Ion-. 71 .".r)' 10", in
(M to3H> nulioms, 1S80-1SS1.

h;

I

KlO {•uncEEUJXns OF Till: XATfOXiL VISEIM. v<.i,.xx.

LIMOPSIS MINUTA (Philippi).

Cl'liifrs I.XW. li-. 1; l.XWIll, li^'. 7.)

I.imoiisis nihinia \kijKIIi. riiins. Conn. Acad.. V, p. r>7li, \X'<'2; \\. \i. L'Sd. l.ssi ;
\:\])\. .Ilhiitnt'in. lu]>nrl r. S. Com. r-'ish anil KiHlicrirH for isss, ]i. .")77. IMM."..--
Smuii. I'., a.. Ikoport NDy. ('ItttUinijir. /oi")l. I.aniclliliriinrliiiita. \ I II. p. lTiS,
isx,-,.._|>,vi,i,. r.nll. Mm-. Comii. Zo.ll., MI, \). '2'M\, IWtl; liiill. C.S. Nat. .Mn>..
\... ;!7. p. IL'. ISS(i. l!i sii. I'.iill. Mus.Cninji. ZoCil., .\ \ II I. p. '-M."', pi. I, li^'. M.
l,S!i:i. — I,ii(Alti>. ( ':inipa!iMi' (111 <'itii(l(iii, .Viinali's ilc ITnh fi'sitc dc I,\on. p.
Mt^. IMM'i.

A vt'i\ (•(•iiminii :iii(l iibimdiiiit .^jx'cios. at ciyiity two stations, hctwcon
N. lat. J J 7' ;5(l' , \V. loiiy. :.7 Hi l."i", and N. lal. .T. tlt'.Ut". W. Ion-.
7! ;{l' ir»", in IK! to L'.-iM latlionis, 1880-1SS7. South to lluibados. in
.")(> to L',L'1.M t'atlionis.— Dali.

LIMOPSIS AKFINIS Verrill.
(I'la:r I.XW . liu. L'. 1
I iiiKijisis <iijiiii'< Vi;i!i;ir,i,. Trail-;. < Dull. AiM(l.. \l,p. II'.'. lss.5.
'I'wo live sin'cinit'us. al station L'd'.L'. N. lat. .Mt r>.S' ;{")". W. Inn-. 71
:{(>". in l'.t7 latlionis. JSS.;.

LIMOPSIS PLANA Verrill.

(I'lalr I.XX\', lit;. .".. )

/.(m«/;>(.s Hp. I .'i N'latiai I., 'I'r.nis. Conn. .\ia(l.. \ . p. l.'><0, ISSl.

LiiiKijisis ///(()(r7 VKiaai.i., Trans. ( unii. .\ca(l.. \ I. p. 111. ISSL': I'.xpl. .illiiilniKs.

I>'i port r.S. ( 'oni. I'isli ami I'islicrics for l,ss;!, p. ,".77. iss."*.
l.iiiiii/i.^iH (uirilii, Viir. iiliiiiit 1 1 Ml . I!mII. 1. S. Nat. Mils , No, ;;7. p. 11.'. ISS!'.
liiiioi'^ix phnni i'.l SII, jiiill. Mils. ( oliip. /oiil,, XXI II. pIl.L'lll. ■_'ll. pi. II. Ii-.s. I!l. I'd,

is!i:;.

'riirt'c ii\e spcciiiM'iis and one \al\(', al two ,->talioiis. iK'twccn N. lal.
;5S I'L' . \V. l()n,u. 70 I7';50'\and N. lat.M 10' .'.o . W . loii,u-. 7ti :u :w\
in 1,.S'_'."( loL!,-l-l latlionis, ISS.'I-ISSII. Suiitli to 1 Joiiiinita. NN'i'st Indies,
in l.l;;i to L'.L'iM latlionis.— Dall.

'I'lic largest spiM-inicn. iVoni station 2710, is IS.o mm. lonj:: IS..") mm.
jiioli: liin.uc niafoin. II mm. Ion,"-: 1 ij^a mental area, .'i mm. lono-.

LIMOPSIS AUKIIA > Brocch* i Jeffreys.

(I'lat<' I.XXN . li-i. :;. 1

.' Inn iiiiritit I'.Kot . Ill, Coiirh. loss. Siil)ap.. II. p. IS,"., pi. \i. lij;. !• ( t. .I« Ifrcvs).
/,//i(.;/(.vi,s aiirilii .Ir.i i i:i:v-. nritisli Cnmli,. 1 1, p. Hll. pi, n . liu. :>. I''^t'l : N . pi. n\n.

111,'. I, Isiiil. — SMiiii, I"., .v.. h'l'jiorf Voy. r/((;//( »r/(i , /oiil., l.ainrlliln anclii.i I i.

.\lll,p.L'.")7. ls,s.-,. -Dam.. Hull. .Mns. Comi.. /ool.. XII, j). L':^. issil; Unii. 1. s,

Nat. MllH.. No, ;;7, ]!. I-', ISS!). — I.ocAltn. CaMiice^nr ilii C(n((/<(M. .\iiiiali - ili

i'lnivrrsilc dc Lyon, p. 1!)7. Isim;.
Not l.iiiioi>siH iiiirilii. vaiii'ty, N'l.iaaii . 'Ti.in.s. Conn. ,\i'.i(l., \ 1, p. 1 Id, is.s."..

One valve, ainoiio |m»i aniinil'era. station :.';>sr). N. lal. -JS ."il', W. lonji.
SS IS', in 7.".0 latlioms. Soulli to (iienada, in L'l to l,r>Sli latlionis.—

Dall.

Ni). ii;;ii.

in:i:r-\\.\ n.i! Moi.i.rsa—i i:l'i;u.l .isn in si/.

Si:

The II irlluM'ii s|H»cim('iis (//, pro/iinilicolii) i\)vu\rv]y rrt'ciifii doiiht-
I'lllly tu lliis species pi-ove to he distinct. Tlie siii^^le s|icciiiieii imw
included ii;;rees well with a s[)eciiiieii (•!' the lussil Inriii liom lliiiope.

LIMOPSIS PROI'"UNblCOI.A, new species.

^ I'lairs l,\\\ , li-. I; l.XWIll, li;;. I.)

I iiiiDjixis (dirilii, \.iriit\ ( .' I \'i;ui;i I 1 . Tr.iii'-. ('onii. Acml. \ 1, |i. I Id, \hKk

('(nnpiii)iti\el\ tew >|ieciiiieiis, iit ten stations, liet ween N.lal. il 7',
AV. luni;. <;■. L'(i ;5U".iind N. lat. M 17'. W. hni,-;-. 7;J !>' 30 ', in 1 .:.L'.". in
1,8.V.) I'athoins, ISSl-ISSO.

Fainiiv MVTlMD.i:.

CRKNKI.LA l''RAGII.IS Venill.

i'lalr J.XWIii, lius. I.J.I

<'rniillii I'raiiilix X'KiUtii.r , I r;iM>. ( Oiin. A> ,iil., \' I. p. III. |ss:,._| t mi,, r.iijj. | '. s.
N;it. Mils.. No. :!7. p. in, |ss<i.

One vahe and a lVa.i;iiieiit. slatiini L'L't;,"). N. lat. .'m 7' Kt' , \\ . li>ii<;-.
71 ;>.")' 1(( ', in 70 lathoiiis, l.SSl.

(ll.O.MID.i:. new lainily.

(.Idiii'uiii \ rijiai I, .iikI I'.rsii. Aimi . .lourn. Sci.. 1 1 1 , |i|i. ."iH, ,"ili, .l.inn.ii \ . IM'T.

Siieil shnit, roundish a I hoi h end>. 1 1 intje plate w ii h a low nl' i rans-
veise leelli each side of tiie niiudh-. I,ii;aiiieiit tliick, elonualed,
altaciied for most of its h-n^ith lo tiie inner snrl'ace oi ilie posteiior
hinuepiale and riinninii' forward in a narrow j^rooxe oeiieath the
heaUs, so I hat its anterior port ion is external and its liiickened pos
teiior port ion is partly internal. No pallial .•^iiiiis. Aniinal not known.

Th.s liroiip includes, so far as known, only tlie ;4'enns (ilnnnis .\r\'
freys. w liich has heeii referred by sexcral writers to tin' Arcide. and l»y
others to tiie I. edida-, tVinii both of which it differs widely, lis rela-
tions to tiie Xuenlida' are s(»inewhat uncertain, owinu to our i.'^iioraiice
ol' the solt parts, in tlu; form and position of the lij;ament il ililVers
entirely from all other jienera cd" Nnciilida- and Lediila'.

,\ more niatnre consideration <»f tiiis uroiip. since the publication of
our loriner article, lead.s us to consider it as a family di>liiici from
Nnciilida'.

GLOMUS JollVpys.

f.7<(mH.v.li:Ki l,■I■■,^ , .\mials Miiy. N.il. Hist., |>. i:t:i. .N'ovcmlH'r, tsTf.. - \i i;Rii.i. Mini
I'li-n. Aiiifi'. ,1(111111. Sci.. III. ]>p. .").!. 5;t, ,hinii!iry, \X'M.

T}i}u . — (llnnnis nihus .It'tfrey.s.

Shell thin, smooth. sulK'ipiilateial. rounded at both emis. willi (he
beaks turned forward. No liinnle or esciitciieon. lliii;^e witli two
seiiesof oblitjiiely transverse teeth ; a small lateral toot ii may Ite present.

six

i'i:ini:i:n{\<.s or /'/// vi/vovi/. }nsri}r.

vol.. XX.

Til*' Inildw illy ;iic (lescrilitMl spocics:

(I. nihns .Icllrrys, North AHiuitic (l'!ni'<>i)«M iind IVom oil' Marlliiis
\iiM'y;ir<i soiiili to oil" Ifio <h' la I'lata ( .Kim'iica); d. Jijlrri/Ni Smith;
(i.xinijtii.r Smith, anil (i . 'nuiijuiUtli ralis Smith, West Indies; (i. j((poH
iciiN Smith, oil' 'lapaii.

GLOMUS NITENS Jeffreys.

i.lii

Zoo I.

1 I'liilr \(\!l, liu>. 1,1.'.>

nihii.i .lia'ii!i;\ >. Annals Miii;. Nal. Hist., p. {;!:{, Nnxcnilirr, IsTti; i'mc

.Inni, 1S7!>. — \KUltit.i. Tiaiis. Conn

I.iiikIdii. |i. 5711 pi. \ IS. li

.\iail.. \ I, ji.-;!!. IS.^I; llxpl. .Ilbtilrosx. licpnit, f.S.d'oin. I'isli and I'ishcriis
for ISS;!, p. .">7t!. IHK").— Smith, K. .\., liN'pnrt NO.v. ('hiilhniio-. /on!.. I.anicjii-

III anr

liata. Mil, p. IMS. 1

SN.-). — i»Ai.i,, I •.nil. f.S. Na). .Mns..No. :;7.p. U\, IHSit.—
\'i;i!i!ii.i anil Hi sii. Aiiioi. .loniii. Sci., III. ]i. .Mi, li;;s. 1. L'. .Jannaiy, lsit7.

The siu'cinn'ii.s which wo icl't'i' to this species ajirce closely in size ami
I'oini with .Iert'i'eys''s I i;^!! res. 1 nit thcr«' is in botli \al\('sa small siii)mar
^inal lateral tooth just heyond the posterior series of teeth, and in the
ri.nlit \al\ea similar but less prominent one Just beyond theanleiior
s»'ries. These are not mentioni'd in .TelTreys's description. In thepo.s-
terior series there are fewer te«'th than in his li,i;ure an«l they have an
acute, oiiliipie, V shajx'd outline and are but little raised: in the ante-
rior series there are four lai'o'er, obli<|ue teeth wiiich are not so dis
tinctly V siiape<l, owinj^' to their obli(pie position and l»ecause the sur-
face of the hinjic i»late is turned downward. The i)()sterior lijiament is
stronj;'. lonji". wedii'e-shaped, widest distally where it o(!eupies most of
the width of the hiuju'e plate; the narrow prolonjiarion runs forward
under the beaks in a narrow "i'roove. There is a thickened. »'dentul(»ua
space under the beaks, separiitinj;" the two series of teeth, wliich has,
when highly ma};nilied,a very small, anf^ular notch in the middle of its
lower eilo'e. which in our specinu'ii is tilled with what appears like the
remains of a ri'silium; there is also a very minute, Vshajted notch in
the external margin. The beaks turn forward. The pallial impres-
sion is rather indistinct, but aj)pears entire. Interior somewhat lus-
trous, but not at all nacreous.

Two imperfect s])ecimens, at two stations, otf Marthas V^ineyard and
oir Delaware Ibiy, in l.r»l I and l,r»(KS tathoms, l.SS.'i and 1S.S(!. South to
b'io de la IMata, in :2J)i to 1,000 fathoms.— Dall and Smith.

I.M'.VIKW OF llli; (iKXKli'A ol' IJlDiD.i; AND Nl('i:i,II).i: ol" TIIKATLAN
IK" COAST OF TIIK IINTTHD STATICS.'

Tlu'se famines are often united by modern malacoloyists umlei' a sin-
gle family (XueulidaM, while others regard them as distinct. They are
certainly clo.sely related aimtomieally, as well as by the structure of tho
shell Thus all the uuunbers (►f both families have a single pair of

• An .ilisiiactiit'tlio portion of thia artido n^latiii;-- to thfsc I'aiiiilirH w.is piiUlisiicd
ill llii- Aiiifricaii .loiuiial of Science, III, p. '"'li Jaiiiiaij

l»!t7.

Ni>. ii:i'.).

l>i:i:i' ir.i III: Mni.i i sr.i—i i:ni:ii i. .(.\7» /.tn//.

Silt

1(1
|(i

silllplc '• loliuhliUK'liiilU^"" (or l>lnlnl»i;ilirlii;ih') ^JIIn; Iwo |i;iiis tt\' l;iij;t'
liibiiU piil|»i, tlic oiiUt (UH'S fiuiiislii'd with loiiif cxloiisilr I;ihi;il tciilii-
cles; a liir^r imisriilar loot with an cxpaiidrd. coiitMNr. hi iniiiiil disk,
adapted tor rapid riiotioiis in iiiii)piM<;' and swianiiini:. as \vt-ll as lui'
ciccpiiij;'; and all liavc two scries of traiisv«'rsi' or uldii|ii(' Ici'th on
the liin^ic mar^iiii. 'riic peculiar structiiics ot" lo(»t and <;ills appenr
lojfetlier t'lsewliere oidy in the landly Soleniyida'. wliicli is e\id«'iitl,\ a
lelated jiroiip, tlioiifili it lacks liinjjeteei li and has a \ t'r,\- ditlcrent shell.
As tiiese three families Inivc j^ills of a peeuliaf and siniidc stincture,
eaeh one consistin;;' of two rows of Ihit ianielhc, ;it Inched to a single
stem, they lia\t' recently Itecn regarded as torminj; ;i specini (Miicr
( Protohranchiatai.

This yronp is of special interest because of ils ;;reat iintii|Uily.
liUrj^c numbers ol' fossil forms very closely allied to cxistin^i' ;;en< ra
and species occur even in Silurian and Devoidan Ibrimitions.

Thus the common living' <;enera Xuciihi and Liihi ar(^ repicsented by
numerous !)e\(»niaii s])ecies, many of which can not be sepmated from
the recent tbrms, even as subgenera, by any t;in;iil»le characters. ( )t her
species <»f the same age. referred to Pahroit) ihi, a<;rcc in nearly all css<'n-
tial eliaraeters with the liviiiu' ^cnns Tindarui. 'i'hese fossil shells are
{jeiHTally lar<;er and stron^ei' than the correspond in ji" livinj^' species.
Many Paheo/oic m'uera which aie now extinct were as hiuhly orL;aiii/cd
ami as nuudi speciali/.ed as their livinj'' allies.

The thin shelled, strongly siphonate jj,-ein'ra. such as )i>l(li(i. Ynidi
ilhi, etc., do mtt appear so early in ^eoloyici*' time ami may be reuardcti
as more modern specializations of the beda like forms. They are al>o
the forms that swim and Jump with the ;^rt'atest activity. Theiclbre
the thin and li^ht charaetei- of their shells may l>e regarded as ha\in.<i'
been secondarily ac»|uired. partly in conseciiu'nce ot' theii' active moxc-
ments, in whieh a heavy shell would be disadvantai^cous. and i»aitly
because the development of lonii' siphons enables them to li\ <• concealed
much of the tinu' beneath the surface of the soft mud in which they
generally live. In Solciin/ii the slndl is still lighter and thinner, in
aecordance with more develoju'd swimminj"' habits. <'ond»ined with biii'-
rowing when at rest. Such forms as Xncuhi and '/'iiuldrld. w hich liav(!
no siphon tubes, must live at or neai' the surface of the mud. o\ er which
they ereep with their larye expanded pedal disk. These have, for thcii'
protectiiMi, comparati\eIy solid shells similar to those of Paheo/.tiic spe-
ci*'s. in form, texture, ami sculpture.

The fanuly Nuculida' dilVcrs tVom L«'dida' mainly in having no siphon
tubes, the nnintle edges being coinjdetely disunited. 'I'he Ledida- are
remarkable for the great variations in the strnetui'e of the hinge-teeth,
ligament, cartilage, and mantle, as well as in the form of the shell.
The pallial sinus may be wanting or well develo|ied. Some genera
have long united siphons ( Yitlditi); some have shorter ones, nioic oi' less
sei)arate(l ( Lcdo); while in iiitdnriti there is no true siphon, but only aii
i*roc. N. ^1. vol. XX oi

8r)0

fi:nri:rnry<is or riir. \.\rio\M. .]frsi:r)!.

vol,. XX.

cIIj'IciiI oiilici' dillVmitiatcd. 'i'lir li;;;iiiiriit iii;i\ In- wliolly cxtniiijl,
as ill Mdlhllii. TiiiiliiriK, rtc, or it niiiy 1»«' nidiriuMitaiy and irplactMl
hy an inlcriial cart ilauc or " rcsilimn." ni- Ixitli may coexist in vaiNJnj,'
devices ur(lc\clo)»nicnt and d(';;('ncration, 'I'lic liin^c tcctli may l>c very
numerous ami leunlaily V sha|>ed in each series, or tlicy may I»e com-
paratively few and iirejiular. sometimes becoming; ol)Ii(|ne and lamelli-
form {SilifKla). 'I'lie beaks yeneiaily tnni baekwanl i Vnhlia, Lviln^
\i(ci(lt(). but in Mdlhtlfi, 'iixtlitt'in. and some otlier ;;eiieia tliey turn
forward. (Mi this ac(!onnt, when theic is neithei' pallial sinus noi'
external Ii;;ament, it is often dilliciilt. if not impossilijc. to tell which is
the anterior end of the shell without the soft parts. Hence nnmy fos-
sil and some recent species have i»rol)aidy been reverx'd in the descrip
tions. Thus many of the fala-o/oic specit's referred to \ inula are
<lescribed as ha\in;,' the beaks turned forward, the Inuj^er end of th(^
shell I;, inj;' cmisidei'ed ]>()sterior, Itnt in niodiMii Xxiiiln the beaks turn
backward an<l the shorter end is posteiior. .Many of the deep sea
species with small, thin shells show no distinct muscular nor pallial
sears, which increa.ses this dilliculty. When a .litlerentiate*! «'.\teinal
lij;ament is piesent, we have assumed that it is posterior to the heaks
(opisthodelic). tliou{j;h a narrow extension usually runs under and for-
ward of the beaks in a j^roove. When the shell of a diinyarian bivalve
ji'apes posteriorly, the existence of a siphon may ^enei-ally be assumed;
for otherwise the internal soft parts would beexposetl to enemies. The
existence of a posterior I'ostrnm or a protrusion of the posterior nuirj;in
deliiM'd by an inferior eniai'<:inati<m indicates the existence of a siphon,
or at least an anal tid)e. Imt these organs may exist without such mod
ilications of the shell. If these lules be applied to I'alaozoic forms we
must conclude that the rostrate and snbrostrate tbrms of I'uhvonviUi,
etc., had some sort of a siphon, and. therefore were not true NiU'ulida'.

Numerous l*aheo/oic species refei'red to the ji'enus P(il(ti>ncUo proba-
bly belonj^' to or m>ar the Tindarina'. Some (d' the species' fiom the
American Devonian rocks can hardly be distinguished from Ti)uliiri<i
by any important structural characters, unless it be the form of the
teeth. It is prol)abIe that \iicnlihs and scNcral related iicnera Ixdon^
near this division, for they have an external li>:aiiient and no resilium.
Tn these ;.;-eiiera the plain, transverse teeth are very numerous and
more simple than in the modern genera, seldom showing any trai-e ot
the acute, V-shaped form chara<'teristi<' of most inodern ,uen.era, though
in some spc'cies thc^ teeth are slightly aiigulated in the middle.

3Ir. Dall has projiosed the family Ctenodontida' to include ntuuerous
Paheozoic sjieeies belonging to Clrnndoula, nud allied genera, some of
which /iltel and others refer to Arci<la' on account of their thiidvened
|)ectunculoid shells. They seem to be allied rather to Tindarina'.

' For r\aiii]>lc SCO /'. coiii^tricla TImII, I', iilana Hull in I'liLioiiloloMy of New York.

V, IM. 1. i)i». :(;!;{. i;;!!, jii. xi.vni, li-s. i-i's, issr>.

- 'rniiiH. \Vay;iU'r Free bi.st., Ill, p. "il."). 181)5

NO. 1130.

DFHi' ir.i ri:ii yrni.usrA-^ vfurii.t. ixn insTr.

fiSl

Tli<» lAMli«lii',a.s here iiiMh'rstood, wt-ir <li\ idcd into live snhriuiiilics hy
I'Msclier, iiiinu'ly:

(1) Ciinillclliii;!' = rt«'iio<loiiti<l;i' Dull -f I'olanntllo .\\\t\ Curillnhin'o ;
(Ll) Siircptiiiii' (fur *SVnv7*/a only); (.'I) I.edinM-; (li Mallctiiiii- (iiichnliii;;
Timl(irlii); {it) Lyrodcsniiitimr ((or iincu'nt fo.s.sil lornis likt^ Lj/nnh.sma^
but iiu'lndiii;; tlie liviri};' <;«Min.H I'liascohis or Silii-nht). An additional
tjronp was toniicd for 8()nH'i otlicr doiihtfnl fossil jyenora. Tin* second
of these {fionps is not well fonnded, loi- Sarrjitti a;;rees rictscly with
Vohlidy excejtt in tin' allej^cd ahsrncc of a pallia) sinus, luit its ;;aj»injj
shell indicates a siphon tiilte. The fourth should not includi' Tiiuhtriti,
whicii lacks the pallial sinus and siphon tubes chara<'teristic of the
rest of the y;roup an<l slunild lie taken as the type of a new Hubtaniily.
The fifth should not incdnde I'luisfoliis, which dilfers widely from the
fossil forms and b(d<»n;;s in the l.edina-. The otliei* ^icneia of this
j-roup aie referred to Tri^ioniad by other authors, and tliat would
seem to be ii more coire<*t arrangement.

Kandly NlJCUid I) K.

NUCULINA d'Orl)i(|iiy, 1H45.

ririirndon S. Wooi>, 1810.

S'liriililUl !•'< McitHiW , isl5.

Xiirinilla S. Wudi.. ISIS.

.\iiriiH)ia N'r.It'ili.l. Jiiid I'.CSM. Aim r. .loiiiii. .Sc i.. Ill, )))>. .".:!. ,"i!t, .l.imiiiry, IH'.tT.

We have included Xki-iiHiik in the Xiu-nlida' with sonic doubt,
because authors dilfcr as to its structure. Some state that its lijja-
inciit is wholly external and others to tln' contrary. l'"is(dicr places it
in the Arcida-, neai' Liinojists, but it has no lij;amental area.

Mr. Dall kindly foi-wardcd tons excellent nnpuMishcd ll;,Mires of two
American sjiecies <d* this {»enus. In these the thickened li<,'ament is
external to the hijijje ]»late, on the end of the shell which is destitute
of a lateral tooth, and is the shorter (jiosterior ?). The beaks turn
toward this eml. Mr. Dal' states that the shells are not distiiu-tly
nacreous witliin.

The Ibllowinji" are some of the known species:

X. niiliiiris Deshayes; .V. onilis S. Wood: .V, cahihra Se^^in'n/.a,
fossil; A', mnnitti Carpentei-, trom the Catalin Islands; .V. snlvnta A.
Adams, from Korean Straits; .V. admnsi \h\\\, from I'lorida and the
West Indies.

NUCUI^A. Lnmnrx'k, 1790.

NikhUi liAMAUCK, I'roillnliic (fllllO N(lll\. i 1. do ('oi|llillrs. |i. S7, \i>. Idl, \~W.

yiiriiliiiiti iii.Nh, licsrlir. It'iist. .Siiiiiiiil., j>. l.Vi, 1S07 (_iii»(; of Adams, ISTiS, nor of

HiUTlH, 18117).
XnciiIaDxiA., Mull. Mim. Coini.. '^*»'"'l-. -^"> V- 2I'», l><Hti.

Type. — Xitcula niiclciiH Lanmrck.

Nn<'itl(iiia (Link) was an exact synonym uv variant of \nciila, of
earlier date, as the descrii>tion plainly shows. There was, therefore,

H'>2

vin)Cf:F.hi\us ttr riii: \ irios \i mi wv u.

Vim.. \.\

ii(» \ iiliti cxruse I'mi' a|»|»lviii;; it to :i tlillfn-nt ;:roii|i ( /,(■(/<», tli;i I liail
aliradv n'lj'ivfd a valid iiaiiu', as was dniii- Ity II. and .\. Adams.

Tliat u s|n'cirs licluiiuiii^ to Lain was niriitionrd hy Link dors not
altn' fli»' ca.st', lor all tlif sprcii's «»(' l.nlii and YnhliK tlirii known wcic
ifl'nicd to \i(<iihi 1»\ I.annirck and all otlicr (•(intliolo;;ist v.

NIJCULA HROXIMA Say, variety OVATA, nuw.
(I'lal.M I.WM, li;r. i;; I. WW 111, \\,^. :,.)

\\ <^ dcsiniiatr Ity this nauH' a sin;;it' s|»»'('ini«'n wliicii (lillcrs so widely
in loiin tVoni fin- uidiiiaiy type ol S'limhi pni.iiiiid that il could well
1m' tidu'ii loi' a distinct s|H'<'ics if it had ocruircd in lai^c iniinlM'is or
in a remote loc:iliry. It is hroad-ovate or elliptical in I'orni and miieli
loss an^ndar and oblique than the typical init.riiim. It is decidedly
compressed with the umbos much less prominent than usual, 'i'iie
surface is flossy, ^rayiidi white, marked with <iistinct lines of growth
and nii(;roscoi)ie, radiatiiij; stria-. The aiiteri(^r end is evenly rounded
and more produc<'d than in jH-oxiiiui : the ventral maijiin is broadly
and evenly rounded; the post«'rior end is obtuse, sli}jfhtly produced and
scarcely anuuhited ; the postero dorsal luarjiin is eon\«'X and slopes
much less rapidly than in /inu iniK. so tlmt the posterior end is iikiic
evenly rounded and bioader. Internally the mariiiii is i)laiii. The
hinge teeth are nmeli as in i>n>.i i)ni(.]m{ the two series are le^s curved
and meet in ii broad aii<;le.

Tien^ith, .(.."i mm.; heij^'ht, .'> mm.

OiM^ live specimen (No. 7.">l()7). station Sfl.J, in Vineyard Sdund. oil'
Cuttvhunk. in is fathoms, ISSO.

NUCUI.A SUBOVATA. new species.

il'liil.s I.XX.M, liu. S; l.WXIII. Ii-. -y.)

Shell small, broadovate, with soinewhar i»rominent umbos, and
rathei- acute, somewhat prominent beaks behind the middle. Surlace
smooth and lustJoua, covereil with rather re,ui!lar, concentric, lines of
jiiowth, which are scarcely visibb* to the naked vyo. i']piderinis thin,
pale ytdlowish ^^reen. The antero-<lorsal mar.uin is nearly s'iaij;ht at
first; then, forinin,ii' a convex curve, slopes gradually to the bluntly
rounded anterior end wliicdi is somewhat jjioduced but not anyulafed;
the postero-dorsal niar^iiii is convex. slopin<> rapidly, and tbrmsa slight
rouiuled an;,'ulation in the middle of tin; posterior end, wheic it joins
the broadly rounded, ventral marj^in. Hiii<,'einar.i;in rather broad and
strtMij; in |»roportion to the size of the shell, with a moderately lai.i:e
rouiuled, slij^htly obliijue chondrophore piojectin^" considerably wiiliin
the margin. The portion of the hinge-i)late behind the beaks is cmi
siderably shorter than that in front and bears about six, slronu.
V shapeil teeth of which the two distal ones and the two proximal ones
are much smaller than the others; i'l froui: of the beaks it is broad and

f

NO. ii:m.

i>i:i:r\y \ri:u unrii sr i—\j:i:i;ii.i. i\i> /;/>//.

S53

f

striiiijuly (ihn nl. iiiid Ixais alxtiit iiiiir l»i(tii<l. cli'Viilcd, struiiy;, trims
wvsv tct'tli of wliitli li\c (»r six in tlir inidtllr ;iii' iinit'li Iai;i«'r tliiin IIm*
Otlu'is; iihovc flu'sc tlM'iilltci' Iiili;;*' liiiir;;ili is sollirwliiit rxpiimlrd aiiil
ov(>iii>(I. 'IMiri'c is ii tliin. r<)iitiiiii<in> li^^iiiiifiit hotli iM't'oir aiid lirliiiitl
llif Im'mKs. I';|»i(h'rmis iliiii. imlc ;irt'»'iiisli yellow. Tlie iiirici xciitnil
iii:ii';;iii is tliiii and phiiii.

l-t'M<itli, !.!> mill.; Ii('i;;lit, .'5.1> iiiiii.

Some (d' tin' siiiallcr spcciiiiciis have a iiarrown' and less tliickciMMl,
liiiij;*' plalc witli (lie Icclli iiiort' di'licatc than in tlic type.

I'oiir spcciiiiciis, at loiii' stations. iK'twccn N. lat. I<> , W. Idii-. 71 '
II' ;{(>", and N. lat. .IT H', W. loii;>. 71' ;{;{', in i:>7 t.. Ill latliums,
ISSl-lssr,.

This species has Some reseinldaneo to .V. tenuis. ])\\t it is iiiii<>h less
oiditpie and inoitM-loii^ated in toriii, and is less inciiiiilateral, the pos-
ti'iiur end not heiiii; siildnineated. wliile llie anti'iinr end is narrower,
relati\('ly shoit«M'. and nineli less oldi(|iu'. 'riie hinjje iiiarj;iii is also
ditl'eieiit ; tlu' teeth are fewer and inneh stronger, and the iiini;c mar^iin
mneh broader, w hile the eliondrophore is smaller, more rounded, miieli
less ol)Ii([iu'. and projects freely trom the inner liin;^-e maryiii instead of
bein;;" iiiiit»'<l closely to it.

it also ])ears s(»in«' resemblance in form to Xiiciilti pi riiiinihini asis
Smith,' Itiit there are marked ditVerences in the hiiip' and number nf
t«'.etii.

NUCUl.A GRANULOSA Verrill.
( I'ImI.-h 1,.\\\I. W'^. L'; i.XX.W III. Ii,u. X.)

Xiiiiilii ijrauuhiHii \i;i;iaii,. I i ;nis. Conii. Aiiid.. \ 1. p.i'sii, Issi; l'.\|il. \ IIm truss,
ii'rpoit I'.S. Com. I'isli .'iiiil i'isln rits lor lss;{, ji.TiTii. |ssr>. I>.\i.i., Hull. I . S.
Nut. .Mii,-<.. No. :!7. ]•. IL'. ISS!'.

'I'akeii at about sixteen statifMis. between N. hit. II .■>;>', W. lon<;". Cut'^
;'>;■")'. and N. lal. ."{s :W ;?". W. lon^-. T.T (I', in .'Jsl to I, (Mil fathoms,
lvS.S(l-18.S(!.

NUCULA VERRILLII Dall.
riiile \('\', 11-. 10.1

.V»(r((/rr Iriijinui \'Ki;iai,i,. 'I imii.s. ( onn. .\c,i(l.. \'I,ji. i;!s. iss.-i iiint iiinmi. islli.uot

Sc^iicii/a, IST").
Siiciilii iirrillii i>Al.l. iSiill. Mils. (iiiii|.. Zoi'il.. .\||. ]>. L'lS, l.ssti; I'.ull. C.S. N:il.

Mils.. No. :!?. p. 12. ISSII; i'loc . I'. S. N:il. Mils.. .Ml.].. L'.'.T, |.l. \I\. liM. 1. IKSJI.—

in sH. i'.iiii. Mils. Cnini). /.(Hii.. Will. i.|.. 'Jio. L'l;:, ]<]. i. ti^i.t;. isi*:!.

('<niiparativ( ly few specimens, at six stations, b«'t ween N. lat. ;>'.• I.'i'
4:.", \V. lollf,^ 7»» 7', and N. lat.;{i; -17', VV. Ion;.;-. 7;{ !»' .JO", in I.I 10 to
l,S2r» fathoms, l.S8l-l8S«i. South to Yucatan, in l.'iO to IjdSo fathoms.—
Dall.

' l»(;iioit \ (i\ . < lidlh/ii/ir, Zoiij. liiiiiii-llihriini'liiutii, .Mil, i>. 2'J~. i>\. win, lij;.s.
10-lOa, 1885.

854

rnocFEDixr.s or rur XATin\.\r. MusEr.yr.

vol.. XX

NUCULA CANCELI-ATA Jeffreys.
lI'liitiN l,.\\\I, liir. ;{; l..\.\\\ I, (ij;. 5.)

XnniUi III niellala \K.i!iili,i., I'raiiM. Coim. .\<u(l.. VI, pii. L':il, L'MO. IHSt ; lApl. .(//.//
troHH. KN'poit r. S. Coin. Fir>li iiiid Fisheriis for IXKt. p.nTt'.. \xk:,.-^ Dam,, Hull.
r.S. Nat. Mils., No. ;i7, ji. \'J. isx'.i; I'ror. I'.S. Nal. .Miis.. X 1 1, ji. _',".«, IH8!i.

A vt'iy iibiiiHliint siM'cit's, iit t'orty-four .stiitions, between N. hit. IL'
47', VV. ioiit;. ()lo4', :iiul N. lat. ;{7^ 27', W. l(»ii^. 7;{ .'.;{', in ;{.SI t()L',().;;5
t'iitlionis, 1.S,S;>-1SS7. H«)utli toolTToha^o, West Indies, in .S,S() t'atlionis. —
Dull.

Family I.KIHD.K.'

sui.i.uuii.v 1 -i-'.i )i Nr.i<:.
LEDA SclumiJiclK'f, 1.S17.

I.ahi Vkuuii.1. and in sii, Aimr. .lonni. Sci,, III, |i|i. 51. liL', .lannarv, IXit".
yiiriilanii IIahui.s, Cat. Hritisli Musuiim. p. ;tlH. I«!t7 (not l.inU, 1X(I7).

'l)n>«'- — />r'/'» r<>.strat<( (Montiijijti, IS(IS).

This j-eniis litis lieeii viiriotisly extended tind icstrictetl by anthojs.
and sevprjil snb<,'enerie tind sectional or()iip.s hasc been pioposed. In
the nioie e.vtended sense it is .setireely ciip.ible of a delinition that will
tlistinjjfiiish it from Yohlia, etc.

VN'e j>roin)si'd, therefore, to festrict it to the typieal Hpecies, stnh as
L. citspidatii (ioiild, L.niiuldtd (Donovan), //. pmndd (.Miiller), I.. Inm
isiihuita (Coiithoiiy). tintl mtmy otliei's«'lo.sely felated. These littve ji loiij;,
ti'i>tv<'d, biciiriiiiite lostrnm, and well developed siphon tiilx's, partitilly
Muited. The pidpal tenliicles tire loii}^, tlat, t;ii)ei'ed, :ind tiiise exteiiiiil
to the bases of the outer ptilpi, which arc brotid with slenth'r, actite.
l)osterior tips.

Mr. Ilaiiis (Hiot«^s rostrnta liimnens jis the type of his \iici(l<ni((, but
no such species oeeiiis nntil (iinelin's edilicm, 171MI; rustratd ('hem
nit/, ITS I, nsed by tSchiiiniichcf tis the type of l.nlti, is now considered
the same i\n fluriatilis Sowerby tind tdso Schru'ter, 1 77'.>; ro.s7/v(/.;
liiiniinck, 1S19, is the stime as ftvruiila .Miiller, 1771 or (>?, so thiit in
uain}; roxtraia Montaj,Mt, ISOS, \\{\ avoid confusion til" names wilhoni
leading to any misiindeistandino of t!ii^ form of the slnill. for till of the
jibove species have the .same rostrtited form.

LEDA BUSHIANA Verrill.

(I'lat.s l..\.\l.\, li-. S; l..\.\XIl, liK. }).)

I.eda hiiHhiann Vi'.ituii i,, Iraii.s. Conn, .\.a<l,, \ I, ]>\>. 2L'!». '_>H(), 1K«| ; V.\\>\. .I/'"/
IroMK, Ktiport IJ. S. Com. Kisli aini Fislu'iirM for IHHW, ji. ,".7ti. i^W^»,— Dai.i , I'.nll
IT. S. Nat. MnH.. No. :t7, p. Jl, \HH\K

A few specimens, oll'Citpe llatteras, North ('tirolina, in HIO futhoms.
18tS3. South to Kloritla St i tilts, in IL'O to ."»!<) fathoms.— Dtill.

' Alien /(un(/ri Harris, Austialiaii T«i. .Moll., Cat. ItiitiHh ftbisoiiiii, p. lUW, IK'T.

NO. UM.

i)r:i:i' w.i rri; mdilvsca^vkuhui. i\i> ursii.

<^1 ).

.')

fi'

LEDA PERNULA ^Mulleri.

(I'l.ltr I.WMI. l\;i. 2.)

I.iild juruiiUi (i. <). Svl!>, Molluscii \U-<i.. Aniir.i N'mv iMri.c. p. .'i.'i, ]il. ."., ii^s. 1

II il, \>TiX.- .\\:\\\IV.\S, I'lOr. /.(i<;l. Site. I.ihmIi'Ii, |i. fiTI. .1 ■, ISTl'. \ kk-

Kll.l., I'lnr. I'.S. N.it. Mils., III. ).. 101, ISHl; Trims, (.iim. .\. mI.. \. y.'ul,

IS.Sl'; II,, I VI, p.L'Nd. pi. \\\, li-s. II, 11(1, ISHI. — Ndt 1».\II,. Kllil. r. >. N;it.

Mils., No :{7, III. \i.\. Iij:>. II, 11(1, INX'.i.

I'miiid :if a riuiiil»«'r<»rstati(»ii.s lK'!t\v«'«'ii N.lnt. Ki 'l.\\ \\ . loim. ."iL* !."»',
anil N. hit. .17 s', W. loii^. 71 .'J.J'Jii I'.'i to 171 I'atlioiiis, 1 S7'J- 1 .ss."i.

I. EDA CAUDATA (Donovan).

(I'l.ilr l..\\\ll, li;;. 1.)

Ann riiiiiliilii l»(i\ii\ • :,•, I'liiiisli .'^liclN. pi. lAwiii: < liciiii iil., p. "•(). pi. \\ii,

li^M. N IL'.
/.((/(( I II mill lit LoVl' \ I ml. Moll. SiMiiil., p. ;!l. (lui l,|i, li'ip. on lii\ cii . ol Mas-,.,

liiniu-v'.s ((1., p. Mm, lii;. 171, isTC— TUM is . .\mci. .Mai. <'oiiili., p. isj. pi.

WW III. li-s. IMI. I'.l.",, 187:i.
t.rdii I'fniiiht \ I itiMil, Trails, ((iiiii. A<a<l., \ , p. .'.71.', IS.^^J. in pari; \ 1. |i. L'HO,

jil. X\\, Ii;;m. 11,11.1. INM. 1>.\I.I , Uiill. r. S. Nat. M ii-.. No. :,7. pi. \ i \ ,

I'lKs. II, M„. is.sp. — ( ; ,|!r--ii. Hull. .Mn-. Coiiip. /o,.l., .\.\I1I. p. L':t|. IMK!.
J.idii liiiidttlit \ KUKii.i. and Iil .sii, .\imr. .louni. f^v\.. Ill, p. 51, liy. Jit. .laiiiiaiy,

is; 17.

This (l('('|H'i- water lunii, prrviunsly ideiitiliiMl as Liiluinrinihi.wns
round at a \t,'ry lew stations iM'twccii N.lat. I'J ."17 , W. lun.L;. (!!• ."><•'. aiid
N. lat,;;7 KI'.KI' . \V. Ion-;-. 71 !.'(»' ;}(>", in IdL'toHH tatlioni>. l.S7l-lS«r.,

I

LL:UELLA Vci-fill mid lUi^h, 18U7.

■hnioiiiii i>VMiKS/..\, Nnnilidi tiiviarir :iicriil. d" llal.. If, .Ai'ad. l.in.ii. p. 1 1 7."i,

1X77 1 not of II ( iiM'.K .
I.tidillii \iniiiii and I'.l --ii. .\iiii>i . .loiirii. Sci., III. p|i. .M, tlL', .laiiiiiii.\ . |sii7.

"fllii . — I. nit I hi III) sstiiit !i,sis (Sront'liza).

'1 ids {fniiip inrlinios a lar^r nuinln-r of small sprcics. lioih li\ inji and
fossil, in wldch the sludl is rathcf slioit, usniilly ovate or swollen, w itli a
;>inall, iieiite or siih;i«nt»' iinicaiiafr rostrum, sit natcd medially or snh-
medially, and dctincd i>elo\v hy an eiiiar^iiial ion or nmlnhil ion in the
posterovtMifral miuoin. 'i'he poHtoro-doi'snJ mar^iin is eonscx. Tho,
eM'uteheon or lioanienlai ar«'a is v«'ry distinctly defined l),\ lliee:irinii,
lint is not .sunken. Tiie chondroplnire is usually small liii-l distinct. The
siphon tulu's ;ire .se|»arate. at least in sonu' ^jiecies. 1 1 iiiclinio numerous
minute tertiary species icr ired liy Seouen/a to the -ection of lulu
nam«'d hy him '/inKniiii. ii\u\ al.so a considei alile number of recent deep
water spi'eie.s gi'iierally de.serihed li\ aiitliois under It tin. \> the
name •Iniitmia \va.s preoe(Mipied, the yroup, wldch seemed to he id' i^cneric
value, reipiired a new name.

The foll«»\\ iiij;- species ap|)es\r to helont: here:

Jj. atiiiiiiulii (rtegueu/a), /.. iiiiohn (Seguen/.u), /.. ptitijjinis (fcse-

sr,n

mm ]■ i'i)i\(,< or Till: ytrtny.ii vrs/vv.

vol.. w

jiiicn/a, /.. iiitiilnrsatK (S»';iiu'li/a). /.. (■«»»/"».s7f (St'j>iU'ii/ii), f(>ssil; /,.
solitluhi (Siiiillii :in<l /.. siinra (Sinitli). iVoiii olV Mra/il: /-. rotij'ntis
(Siiiilli"). titV llu' .\/.»»r«'s; /.. ///<)/>/»((/<(( Smith), /,. /ov(/^(//MSiiiitli), and
/.. ultima Smith i, IVom tlic Patilic: /-. /Hr.s-.sw/jr»,v/\ (Scgiicn/.a), frttm
oil' th«' l»arl)a(h<.«<. iioithwaid : /.. iinssdnnisis (>>{'<rnvu/.n \ wiv. snhlrr is
N'cnill and I'.nsh, oil hflawair Uay, northwaril ; and I., ixitra N'crrili
aixl Mush, (ill Marthas Nincyard.

LEDKLLA MKSSANENSIS , Seguenza).

( I 'hi I.' I..\.\.\l. liu. it.)

lain iiiiiiiiliiiihi .Iiiii!!^-. \iiii. Mil!.;. Nat. Hist., \<. (i!', .Inly, 1H7tl iimt \'u\
Iticil 1. - Si (iiiN/.A, .Nik iiliili It-r/iarii' iiHMid. il' Hal., li. A<a<l. I.iinii, isTT.

|1. 11""., III. Ill, \\iiH. 1."., l.")(l, !.".<.

I.iilfi Hi(.v.i(i»r.'(v(.N ,li:i:ii;i:\ s, I'lcic. '/.oi'A. Soc. I.iiinloii, i).r-7(i, .lime. lH7!t. — SMiiii.
v.. .v., K'liiiiil \'(iy. (Iitilliiiiin-, /oi'il. I.aiiii'lliluaiiilii.ila, \ I il, p. L'l!7, ISs",
l»Ai!.. liiill. .Mii,>4. ((iiiii), /oi'il., Ml, p. 21!', ls.sti; Hull. r. S. Nat. .Miis., .\..,
;::. 11. II. isMt.

Tin' shell which is licrr i'('j;ard«M| as the 1 rue »/r.v.s«f*/r/(.s/\ i.s small,
.swollen, <»\ ate. nraily <'iiiii lateral, with ;i distinct. sIkhI, oldiqiie rostrum
bent (hiwnward at Ihe lip and se|iaiated from the body of the shell liy
a disiinct de]ii'ession and mai^inal indentation, 'i'he shell is thick ami
solid for .so .small a species; its surface is coveri'd with line, i'e;.',nlai',
raised, thin, concentric lines .seiiiuated hy widei- concaNc ^^.ioon <•.-;. 'i'h,.
liinjie inai^in is thick, stroiiji, with altont seven or eii.;ht, mostly s r<M):;,
nearly erect, and not crowded, te«'th in each series. The <'h»>ndrophorc
is relatively lai'^e, trianynlai'. and projects on tin- inner maruin. The
epidermis is p;ile yellow. .Vc«'ordin<;- to .Icifreys the siphon tubes an-
ion^ and se|»arate.

licn^i'th. about 2.<> mm.; heinhl. about _ mm.

A few specimens, at three stations between \. lat. .'^S'^ L*9', \V. Ion;.;.
7;i <.»', and N. lat, .".T , W, h)'!^. 71 ^ 'iV. in IMlo to L',(iL'0 fathoms. ISSl-S."..
South to the r.arbados. in .'VJ to LMCl'l fat horns.— hwll.

V

No. 11

LEDELLA MESSANENSIS (Sepuenza) variety SUBLEVIS, new.

. I'lalo l..\\\l. lii:. 7. i

]iil(liit tiiissiitii iisix, viiiicty \i.iaai.i, riaii>. i imii. A<atl., \I, j))). Jl.'7, L'.sd, Issl;

l".\]i!. AiUiitrom, \\v\un\ V . S. ('.im. I'i.sli ami l'iMlnTirH lor |SM;|, p. .')7tl, IKh.'..
l.eilelln mfsiiiiiiisin, vaiirly \' iiuu 1.1. ami HiMi. Aiiicr. .Imirii. S» i., Ill, p. lid.

li.U. i:», .laiiiiary, Is;i7.

This Nai'iety diHers from the foiiii ;d»ove described, principally in
ha\ in^ the conceiiiric sculpture w holly or partially ob.sidete and in il>
somewhat more elon.uated form. It has nino <m' ten tt'eth in eaclr
serii's, due perhaps to ilie larj;'er si/e of the si>ecimen.

< 'omparatively tew speeimeiis, at thirteen stations, ImM ween N. I;il.
41' 17 , \V. loiijr. Ill T, and N. lat. .'{S lM» . \V. loiiy. H) S' ;iO". in l.ls"^
t(» 'J,o;{;i fathom.s, ISiS.J-lvSSij.

N".n:i'.i. i>i:i:i' 11 A I i:i! Moi.i.rsc.i- } i:i;i:u.i. .i\i> /;/>//. s57

LEDEI.I.A PAKVA Vcrrill ami liiish.

rhitf I.WXl, n-. I. 1

l.xlillii jiiirvii \ i:i;i;ii i. .unl Hr-ii, \iiiiT. .Iniiiii. Si i., Ill, p. M, li^;. Is, .l:iiiii:irv,
ISH7.

Slicll iiiiiiutc, ii;iii(i\v oVMlf, llif aiitcrini- cml tin- loiiyii' niid (»l)lll■^(•ly
roiiiHlfil. iiiid till' (tustci ioi' nitl with :i slioit. siilttniiicatc iiitMiian uis-
tiiiiii. I 'minis soPM'W liat swollen: beaks ii litllr iiroiiiinciit and tiiiii.'d
slii;liti\ hackwaid. 'I'lic smtact' is nearly siiiont li, show ini;- oidy inifin
scopic lines of jir<»\vtli. The aiitei(» dorsal liiarj^iii isi'Uinyated. sliiiJitly
et»n\ f\, ami slopes \ ery gradually to the nmiidi'd aiiteiior «'iid ; the
ventral mai uiii i> iMnadly ami evenl.N eoincx. Iml suinewhal pindifd np
jiosteiiiM ly tt» Inrm a sljj;ht rmarjiinat ion helow I lie rostrnin. which is
short, narrow . sniitriimate at the tip. and is delined iiy a sliuht, ineon
spiemais rid};e; tin* postero dorsal margin is nearly st rai.L;lit and sh)pes
rapidly to Jlie upper an^h' "d" the lostriiin. The hiiijuf plate is slroui;'.
••onsidei altly t hiekenetl. wit li a \ cry olitiise anuh- at I lir licak : t lie ante
rior ]>ortioii is the loii.ufr with thf inner niainin eon v<\, and l hi- posterior
jiortioii is the wider, more ol)li< pie, with the inner margin ><l rojij^ly eon
cave; the plain ouier margin is sharp and piojeets considerably al»o\c
the teeth whii'h are stroii}'', stand nearly erect, and arc h ss Vslia|>etl
than usual. There aii' about lilteen in t he anlcrioi' scrit's, of w hirli
three or four proximal ones ai*- ipiite small, and nine si on I cr ones in the
posterior sci'ies, iiicludiuj;" one wry small one next tiu* lieak. 'I'iie( lion
di'ophore is rather small and deep with a ilistiiictly projcclinL; inner
edjut'.

liCii^^lii. ■> mm.: Iici^hl. _ mm.

()ne val\e (No. 7S;i(l,"»). station L'lls't. ,,|V MmMlias X'ineyard. in ."»•_'.'»
fathoms, ISStl.

'I'liis species seems to be closely allied to I., snnni fSmitln from off
the coast of ISra/il [ N'oya.iicol' t he Cliiillniiji ; i. but that species, although
of tin' same >\m\ has fewer teeth, nine ol' w hieh ar(^ sai«l be anterior and
twelve posterior.

F^Oh^Tl.A ND! A Mmi.Ii, I;jn7.

I'mlliiii'liii \iia;iii .Mill llr--ii. Amci . .Iituni. Si i , III |»|i. M, il.'. .l:oiii:ii \ , Isi'T,

Ttifu . - I'm lldiidid tirfti((i{i I ray) 1S1I> /,( ihi i>i>iiliiii>liiii ( llitclirdck ).

We coiisid«'r this a distinct u'cnus. but would lestriit il to theoii;^'
iiial type, unless a few species, which we ha\ e not seen. >lionld pio\e to
lielony to it . Iiiaiiy<'aseil does imt appi Mthat aii\ of the noithcrn
species of" l'airo|M' and .\inerica that ha\e been referred to it aie really
closely allied t(»tlH' type. In many respei-ts this ycnus is intermediate
betw'een l.rthi and Vohlin. In its tdosetl shell, detinite rostrum, eti-.,
it ajj;re<'S more nearly with the Ibrmei. but in j;ciieral outline, with the
latter.

PHH

808

ruoi r.i.niscs of tiu: y.rrio.wn. .i/r.s/r.y.

Vol.. w.

YOLDIA Mollef, 1842.

Ytildiu \i;iti!ii.i .iiiil I'.i -11, AiiiiT. .loiiiii. Sri., III. ]i|i. ,Vi, (!•_', lii^H. IL', M, .hum
iiry. IS!i7.

Ttii>r. — Yohlid liijiKrlmrra T«>rrt'Il=: Volili<( urrthn M<'iller (not (li'ay).

We liavti i«'.stri('t(Ml this ^cmis to tlu^ typifiil fonn.s. .such as V. Vnun-
tiiht (Say). V. s(iin>till(t HWmUl), Y. mi/alix iCoiithotiy 1, and nians closely
allied foiei};ii species.

These have a nearly smooth, eonipressed. lanceolate, j^apin^ sliell,
more or less prolonj,'ed and tapered posteriorly, with a poorly <lelined,
wide I'ostrmn, ^icnerally withont i'arinations. The external li;.;anieiit i•^
niaijiiiial, I'eehly (h'veloped, c(»ntiniions undei- the beaks, and not nniiii
dilVerenliated Iroiii the jreneral epidermis, Tiie chondroplinre is larjic.
concave, and projects williin the marj^in. The pallial sinns is laiuc
and deep. The siphon tubes and posterior pallial tentacle are ion-.
The palpal tentach's are hm;:- and lai)ered: in lite they may e.vteiid
nearly to theeiulol" tlieexi)anded siphon.

ADRANELLA, new subgonus of Yuldia.

Tjfpi'. — Aditoirlld <(i:<((>, new species.

This sui)^('nns is iillied to Yi>l(liii. but is distinjiwisbed by its obloii;,^
t)vate, compressed form, with a broadly rr)und«"d. jtosterior end, ha\ in;;
a very small, nearly obsolete, rostrum. Surface sculptured with dis-
tinct, raised, conci'ntiic lines. Ilinj,^' plate and teeth strong, liesiliiint
occnpyiny a distinct i>it in the apex of a lar^^e shelf like, trmnuulai
clM)ndro|)hoie.

YOI.DIA lADHANKl.LA' CASTA, new species.

I I'JMl.- I.\\\. (iu. 1.)

Shell small, oblonn IIS ate. .sinnewhat compressed. iiie(|nilateial. wilh
the posterior eiiil a little the lonjier and considerably the broader.
rml)(»s small ; beaks cuived inward an<l slii^htly l)ackward. .\iitc:(»
dorsal mi irgin sliyhtls concave near tiie beak, a little <'onve\ opposite
the distal teetii; ant«'rior end a little mirrowed, obtusely rounded;
vi'ntial mar[;in broadly an<l e\enly rounded with a very faint uiidu
lation pttsteriorly ; jtostero doisal marjiiu a little convex, sloping; less
than the anterit»r, and Inrnini; up at tlu* end so as tc) form a sli^lit.
hardly distinct r(»slrum. The iiin;;e plate is rathei- larj^e and thick,
especially distally 011 each side, becoming' narrow and turninj; upw.inl
at th»> iM'ak, wlieie it is interrupted by a small, lather deep I'-siii il
pit. whi(!h is bordered interiorly by a thickened extension of the liin-v
maVjijiii forming a sort of shelf, the whole constituting a broadly Irian-
gidar chondr(»phore with the pit near its apex. The anterior sen'-> of
teetli contains twelve, of which threeoi- four pr(>\iHnil ones an* \ciy
small, and form a series whicdi curves upward, exterior to the clioii'h"
phore, and tt-riuinates at the superior margin of the shell: the ii'ih

1'

Ni) ii:w.

i>i:i:r-fv.i I i:i: Mi>iJ.rsr.t—ii:i;i;ii.L .i\i> in sii.

S:.'.!

hccoiiu^ l;ir;iT. stroiiii, and tliicU distiilly, with Innatl V .slia|i»Ml buses
hcparalfd .>y (le«'it pits. In the itostcrior sciics, wliii h is a little tlic
loii^tT, there are eleven tc«'th corresptiiidiiin in foini and arraiiueineiit
with those of the anteri(»r series. The exterior siirlaee is rej:iilarly
8('nl[>tiire(l with itroiiiinent, sharp, eoneentri<\ raised lines separated Ity
wider intervals. Interior very ;:lossy. Muscnlar sears and pallial
line not visible. Ilxterior senlptiire elearl> sei-n tlirouLili the shell.

lieii^fth, 1.2 mm.; heij^ht, L'.S nun.

One valve, amonj;" l-'oraiiiiidlera, station Jl."))*, N. hit. 1.! .'.I' |.'> , \\ .
loiiff. Sio 20' 10", in liS'J fathoms, ISSl.

ORTHOYOLDIA VcmmiII iiiid tin^h, ISO?,
OrtliDiiiihtiii \ laatiii. .iinl lii'SM, Aiiii'i-. .luiiiii. >< i.. Ill, pji, ri.'i, lii'. .Imiiumi v, IS'.tT,

T\ii>i. — Orlliojinhliii scfipiiKi (Dalh.

Shell oidoii;.;, uapin;;', blunt or roiiinled at both end>, wilhont a dis
tinet rostrum: no carina. Tallial sinus Iar<ie ami broad. Teeth
numerous in both series. i>. scupinii (haliu from oil llra/i; and o.
solenoides (I)all) from tlu' West Indies.

M E(iA YOLDl A V.-iai 1 1 ii iid Uti^li, tS97.

Mt;liiiiuliliit \Kiaai.i. :itiil lirsM, Aiiht. .louiii. ^^< \., Ill, |i|i. .'i."!, t>2. tiu. 17, .lannnrv ,
ls!t7.

Tifjn . — Mcijaj/ohliii tinaiiivi'itfinis (Storer;.

We have established a new };en<'rie ^rdiip foi' this lar,u«- and well
known species, whieh has sometimes been referred to YoUini and some
times to r<iftlt(iiili(t. No closely allied species is known. It is pioba
bly thelarjicst known species of this family ami is remaikabh; tor its
broad, short, compressed lorm, with a \cry sinut, blunt, indelinitc. pos-
tt'i'o dorsal rosti-iim, and with a low radial i'id,i;*', eiidiiij.;" in a po.>ier(»
ventral marj;inal lobe. The <lion<lrophore is remarkably lar;;<' and
stronj;, i'oncave, striated within, and piojects much within the mar.Liin
of the hi nj^e plate. The pallial sinus is lar^e and de«'p. In outline it
.somewhat resembles ty|»ical l'i>rlli(iiiliii, but differs in bein;^ broadi'r,
tiatter, and yapin^ at both emls, and in lia\iiru a strongly developed
external lipimi'iit. I'rom Yohlld it also dilVers in the last (•iiaracter, as
well as in outline, but aj;rees w ith it in its coinpi'es.sfd ^apinu shell.

The jiostero ventral mai'^in of the mantle forms a iniuch like piotni
sion, eorres[)ond!ii,i: to the radial i i«l,i;e. The siphon tul'cs are. lonj; and
united; the posteiior ;tallial tentacle is |.»n<; and --lender. The palpi
are very larjj^e. 1'he palpal lenlacles (»i initiate fr(»m the body wall at
the base of the outer [>alpi; they are huiju and tliiek. wiili a larp*
furrow on one siile.

800

ri;()ri:r.i)ixi:s or riii: \ iri<>\ \i. ur.'^rr.v.

Vol.. X \

)iihliii riiinliirin \'Ki!i:ii.i , Trans, ("oiui. AcjkI.. \1, iip. L'L'S. 27!', iNSl.
Mirroyoliliii rcijiilitrlH N'l.iaMi.i, .iiid Hi'sn, Aiiic r. .loiirii. .Sri.. Ill, p. .".»!. li-s. °., le,
.laim.iry, In'.i".

This sjH'cit'S clo.srly i'esrml)l('.s the vt'iy yoiitiii <»t McudjlohliK tlinicia
Janiiis (Ston'i) \ t'lrill iintl I'.ii.sli. in the cliiii iictci' (if the. liiii<;<>. S|icci
nuMis of tilt' latter ii»(')isuiiii<i' .">."» imii. in Inijitli lia\<' flie rc'Iali\(l\
lui'};o, coiicsivo, caitilajic pliito Jii.st Itct'oie the ImmUs, \\lii(!li cinvr
stroiiirly backwaid and arc nearer the center <>t tlie shell, and tliclcctli
are nior»' nnnicroiis and inoic slcndt'r.

In .1/. nyiiluris ^h^^ shell i.s cordate ovale or veneriloiwn. The ItcaUs
curve stroii^My toward the short (iiiiterior ?^ <Mid. Tlieic is on this ciul
a sunken lunnlar area, delined !>> a slij^lit <;r<)ove which indent- tln'
hiniit'-niai'.uiii. I'hc anterior ( .' part of the hine(> niaryiu i.s tlii<Kciied
and ihcur\('d alonj;- tiie Inniile and hears an inner rid,ue and lour <'i vc,
small, blunt teet h of which the ]>roxiinal fwo ])i'oieit above the in i ^in
in a doisal view, the others are low and latlier obseure. I'ndci rlie
beak the hinu'e i)late is thickened, siniions, edentulous for a short dus-
tanee; back ( ?) of this theie is a larp', thick, obli»|ue, eoiiea\e eln»«
drophore which occupies the whole bi 'adth of the hinge inartriti an«<
pi'ojects inward bi'yond it as a shelf like bordt-r; beyond this there is a
series of six or st^ven proiuineut, blunt teeth. The exteiinil li;;aiiicnt
lies in a. distinct grove along a large part of the »Migeof the hm-cr
(posterior?) dorsal inaruin and runs under tlie boak, but fades uiii in
front of it. The pallial sinus is not visible, conseipiontly i' i"^ »i>t
possible to decide winch is the anteiior <'nd.

Nn. li:i'.l.

iti:i:i'ir.iTi i: mdi.i isr \ -vFinni i. .i.v/» lusii.

sin

l'>iit one s|)»'ciiM('ii iVoiii st:itiiiii l!l!». ntV Tliiilclit'is Islaiid, in IK
fiUlloms, ISTS, liaH Imumi rrH'ncd to lliis species, ln'sidcs tilt- l\p('
spcciiiit'iis (No. ;;,S|'J()> stiilioii 1(>'.>.'., otV Mintliiis \iiit'\ mil. in '!ll»
rillliuiiis, ISSL'.

YOLDIELLA V.-riill ii in I lii isli, I s- 17.
)'iil(lifllii \il!i!iii. Mini I'll ^11, Amtr. .Icviiiii. Sci., Ill, |i|i. "i."!. •;;;, .l;inii;ii \ , Is'.lT.
'll/jlt'. — Y()l(lirll(( llicidil (l,(»\rli).

Tin's j^rniip iiifliKlcs ;i liii'^^c minihor of small, mostly (Iccpscii spi't'irs
w itii jilossy. iridcsiT'iit, ovate, and nsnally wt'd^c-sliaped shells, n<'arlv
always lia\ in;;' a slijilit antrro \ antral sinuosity, wldeli Jeehly deiines
ill! obsenre, hhiiit, roslal region, without aii\ ilclinito eaiiiiation. 'I'lie
shells do intl ^ape, but close lij;iitly oxeejtt that at the rostral aiiL:le of
some species there may be a sli«;ht diverj;«'nce. The internal cartila;,^',
whieli is olten relat ively larne. occupies a simpl«' notch which iidcr-
rupts the hiujue margin more or less completely and ucnerallx shows
e\ternall\ in a dorsal view : the notch usually teiiiiinates within, on
the inner or Iideiior surface ot" the liinj;e plate and is often hounded
within by a sli^iit riduc A weak external liiiament is picseut on the
postero dorsal margin. A relatively small pallial sinus has been
obser\ed in several of tlie species, but, is usually imli^tinct. The
siphon tul>es. as obserxed in a lew of the species, are slemlei- and
united for more than half their leii<;t)i.

'i'lie fbllowiuji'jire some of tile species: ). hiciihf (Loscm \ «'rrill and
liush, Y. iris N'errill and I'.usli, and \ar. stricla \'eri ill and i'.ush,
Y. in/fatd N'eirill and Ibish. V. im niisinrini N'eriill ami i'.ush, and Y.
jifl'rvjiHi (IlidaliiO) NCrrill ami Ibisli. oil' Cape Ilatlcras, North Caro-
limi, northward ; Y. <1i.ssinii!ts \ Crrill and l>usli. iiortli of Cape llat-
teras, North Carolina, noitliwani ; Y. /rtitoim N't-rrill ami I'.ush. olf
('hesapeake I'.ay, northwar<l : Y. niinnsritdt \ Crrill and liush. ami )'.
sii}tniiiH«i<)((\vvv\\\'.\\\A I'.ush. otl" Delaware Hay. noithward : Y. /'li
(/i(h( (Torell) \'errill and I'.ush, and Y. ciirfu \ drill and lliisli. oil Mar
thas \'ine.vard. iiorthwaid; Y. .sidxdufiilnhi N'eriill ami I'.ush. ami
Y. IcnficuUi (Mt'dlei) N'errili and I'.usli, var. nuihlio \ errill and i'.usli.
dull' of .Maine; Y. cxjHxvsn (.letfreys) \errill ami I'.ush. olV (iiand
I'.anks: Y. parliio \errill and I'.ush. southern ; 1. //«///#/ 'Smith > X'errill
and r.iish. North I'acilie.

YOLDIKLLA LUCIDA (Loven i Vcrrill and

(J'lMt.s I,.\\\1I. li};. J; I.XXX. liR, :«.)

YithlUi liirida I.oVKN, Iinlex Mollnsconim. |i. ill, IMtl.
.'/,((/(( oliind Stimi'son, Proc. itoNtun S.k . Nat IliHt I\, ]i. li:!, IX".!: SIu-Dm New

V.Uji., ]). 10. iil.ii.lif;. 1. isr.l.
laid hicida .lia I ia:vs, Itritisli < Oiicliulony. N', p. ITil, |.l. < . li;,'. I. INJ'.t.
)'tildia ohcM (Joui.i), Ifi'p. KM li's • ri. I"' Mass., itinnny'H <«<l., p. I •">.■">. (i;;. 4<»;{, ls70.
L<:da nhcm TitvoN. Aiiier Mar. Cinicli., i' 1X1. |il \n » vm. lij^s, Whi, TiUl. 1S7;(.

Sf]2

i'nnci:r:i>i\t;s of riii: .v.r/vov//. \rrsi:rM.

vol.. XX.

)<ililia oliiHii \i;i!i;ii I., .\iikt. .Ictuni. .'^<i.. \ II, iip. iti, Ml'. .">n:;, 1H71.— Smi rii iiinl
IJAiK.i'.i;, 'rums. Coini. .\(!iil., ill. pp. IS, j;!, I.STI. \ kimiii.i.. i'.xpioratioiiH
Ciisfo liiiy, pp. ;r>L'.. '!(),'*!, IS7I; liivort. Aiiiiii. X'iiiiyiird ."^il.. ]). :!!••!, I.'^TI.

rorlliiuiliii linidii (i. O. S.\i!s. Molliiscii Ii'c^. .Vrcticic \(irvof;i:i', p. liT. pi. I. li;;H.
X(i,sl,. 1»TH.

I.iilii hiiiilii ,lr.i TUF.Ys, Proc, /(t(il. Soc. London, ]i. ,"7X, ISTil.

)i>liHa hiridii \'i;uitii.i,. Trims, (linn. Acid., \', i>l. xi.iv, lifj. l.lSSi'; vi, )). L'7!t, IHSJ
I in )»jnt); I'iXpl. tllialnms, I.'cpoit I'. S. Coin. I'ish Jind I'iHliciii's for IHS;{,
].. .'.7<l. is.v", (ill p!irt).--I!rsll, I'lnli. .Mus.Coinp. Zo.'..|. .Will, )>. L':i;!, lH!i:;.

)ol<lifllii hiciilii \i;i:i!n,i. and lir^ii, Ann r. .lourn. Sci.. HI. p. ."),",, |"m. 1 1, .laniiary,
l«!»7.

Shell .'siii;ill. swolloii. snboviitr, with a ]toat('ri(»r aiitilo. siiiootli, or
inon' or h's.s .st licilatf, iiidcsct'iit. The imibo.s are but little proiiiiueiit,
iiifntiit of the iiiiddle; llio boak.s interrupted or obliterated by the dark
central eartilaj;e wliieli oeeupie.s ;i relatively huj^e luttch int<'rse<*tin^f
the entire thiekne.s.s ol' the hin^^'e niarj^in. 'i'he antero dur.sal inarfjin is
convex with the edj^c a little expanded: it .slopes rai)i<Ily from the
beak to the anterior end which is obtusely rounded : the ventral nuir-
jjin is br(»a<lly and re^idarly cur\ cd lu'arly to the posterior end where
there is u .slijiht protrtision eorresjjondinj; to u faint undulation of tlu>
surface; the, posterior end is somewhat wedji'e shaped, a little coin-
j»resse<l and ta|iei'ed, and nuikes a distinct, but ol)tu.se an^le where it
joins the dorsal mar;,dn in lin<^ witli a rounded posteritu* rid<.:'e rujinin<r
from the convex part of the umbos; just liclow the aujile the mar^iin is
usually convex or sulitruncate and without any delinite lower anyle;
the posterior dorsal niarjiin slopes less rapidly than the anterior, is
nearly straij^ht with tli«! edjuc compressed and a little expaiuled into a
thin keel which is usually sli;,:litly convex in tiie middle. The hin}.;e-
niarjiin is strong:, somewhal |)rolon^ed, scarcely aniiui.. ted in the middle;
tiu' part in front of the ('hondrophore is well arched and bears, in the
lar;,M'st specimens, nine or ten, sharp, prominent, anyulai- teeth, of which
twoortiiree nearest the beak ai'c (piite small ; the jtosterior i)ortion is
nearly straiylit. a little lonjjerand narrower than the anterior and beais
about eleven thin, shai'p. erect teeth, counting" oiu> or t wo minute proxi
null ones: a thin smooth marj:in extends outside both .series of teeth.
The cartilage pit is relati\ely larj-'e, in the form of a iu)t('li. and cuts
throufi'h the hiiifje-niarjiin into the substance of the beak itself; it is
occn|»ied by a daik br()wn re -ilium which usually shows plainly exter-
nally, .lust in fiont of tlu' caitila.:.;(' pit on its border within the series
of teeth, there is a small conical, tooth like ])rocess in both valves. Tiic
lij;ainent is thin ami delicate. I'-xternally the shell is covered with ;t
jilos.sy, yellowish, or ])ale olive epidermis which reflects brilliant ])ri<
luatic colors; the surface is nuirked by faint liiu's of grow^th aiul frr
quently also with line concentric j^rooves or sulci, especially toward
the ventral and anteiior marv,'ins: in many specinwns these are ab.seiii.

I.en.uth of one of the larj^est specimens, 7 mm.: hei;;ht, 4.2."» mni.t
iM^'adth, .">.L' mm.

Found in small numbers, at many stations, between >i. lat. 43- 3!>',

NO, IKt'.i

AV. 1.
.-.It J li
Th
si/e
thel
it is

])ost(

smal
Sp
fectl>
Si)it/
we
deci(
the
doub
placM

Nrt. unit.

i)i:i:i'-WATi:i; Mm i.rsrA—VKnnn.L i\n nt sii.

«n3

A.

I

\\ . Imiim, CD L'L". iiiul N. lilt. .;:, l- lo . \V. I,,ii-. 7l :.7' i:. . in •_'•_» to

r.i«; (afi s, is7L'-i,s8r».

The most prominent cliiiiiifU'r (»r tliis sjn'cics is tli«> iclativi'ly liiruo
si/c ot" llic ciiitilajif pit uhjcli intersects liotli I lie liin^e !n:ii ;;iii> and
the Iteiiks and is tliei«'ton' plainly visible tVom the exterior, hi outline
it is similar to ) . iris and )'. Injhilo but is nioro pointed and mirrowor
postciiorly tliun either of them. They dill'er also in havin;; mneli
smaller eaitila^i'e pits and in tiie nnml)er of the ti'etli.

Specimens Ibrmeily identified as Yohliti (»/>r.s7( Stimpson, a.i,Meo per-
le(;tly with aiitliiMitic speeinu-ns of litcnhi sent by Doctor l-'riele from
Spit/.ber^-'en. As iion«' of the species known to us ajjrce snthciently
well with the des«Tiption and (i<,nire of Ijdit tihiwtt Stiinpson, foi- ns to
decide deliniteiy as to its coirect position, unless we are to consider
tln! ligiire a very incorreci representation, we prt'fer to let it remain
doubtfully, as a synonym of V. hiiitht. where dellreys and ntlieis liasc
placed it.

YOLDIKLI.A IRIS, new species.
(I'liil.'s l,\\.\, li-s, I. L': I.WXII, li-. 11.)

Shell small, tiiiu, lather deli(Mte, lon^.'-ovate or ovate-elliptical, with
tile beaks in front of the middle, not much swollen; snilace smooth, or
nearly so, with brilliant iridescence. Tlu^ antero dorsa! margin is con-
vex and slightly .arched, slopinj;* },nadiially to tin; obtusely rounded
and slij^htly produced anterior end; ventral margin very broadly and
evenly curved; posterior einl obli(|ueIy iiscendin^-, obtusely pointed or
rounded at the tip with a slijiht dorsal anovulation: posterc. dorsal mar
^in slightly convex, slopin;.'' but little, ]iinclie(| nu into a thin, rather
prominent keel. The umbos arc small and proiniiieiil with the beaks
small, (Mirved inward and bat-kwai'd. closcdy appressed to the maijiin.
The epidi'rmis is ;ii'iiyish tu- {greenish yellow, smooth and shiniii;^; the
surfac«ws brilliantly iridescent, covered with faintly marked, line, c(»n-
centric lines, most <listinct near the \ciitral maijiriii and anteriorly ;
under the leua these appear like faint, close nndnlations n\ er most of
the surface. ICscutche(Ui <lcliii((l by a well inarUed depressiun.

The hinye-maiyin is tlii( kcned and forms a very obtuse anjilc at the
beaks; the itosterior portion which is (uily sli;vhtly (Mirved distally is
louf^er than tlu^ anterior which is nearly straijvht. In tiie lar^^est spe(;i-
mens there are twelve or thirteen acute er«M't V-shaped teeth in ea«;h
series, includiuj'' one or two minute, ]»ro\imal o!i<'S. The resilial pit is
minute, situated (ui the inner face of the thin edentulous hiii;:e-plate,
beneath thcj beaks, ami faces ventially so that it is sciacely visible in a
front view and but partialis interrui)ts the hin<ie-pli'.t;s Outside the
series of teeth, on both sides of the beak there i.- a smooth, raised
margin.

Leiifjth of «)ne of tlie laru«'r specimens. 7."> mm.; height, "i mm.; from
beak to postcuior end, l.."» mm.

i;

. !

^..IJJ'I

«n4

ri;'K'i;/:nf\f:s or Till: vc/vovir vrsrrn.

Vol.. XX.

r< III III I ill riMisiilri'iililr II II III I M -IS. :it ill )i lilt rmt y li\ <• sliitimis, lid wt-iii
N.liil.lT 10, VV.IuiiM. 17 ;;.")' ;{(»', and N. hit.. •..■■) lU In , W. |ni|o. 7 | ^
.".7' I.')", ill L'(».\ to 7S1 liitlioiiis, IHT-'-lSSC.

This ,s|u'«i('.s i.s more rlnimatet! aiiil iikhc rojiiihiiI.\ <'Ili|iti(iil I limi any
of llic allietl s|ic('i('s; llic liiii;;*' iiiai-;'iii is al.so Ics.s aiij^iilalni.

A .siii<il»'siM'ciiiu'ii(N<>.7 l.".L'.">),slaIi(»ii l.'J. (ilVCaiic Saldf. itilto fat In mils,
IS77. at lirst tlioiiuiit to be a distinct s|KM-i('s, dillers linin the typical
loiiii ill hciiiL;- iiioic <»l)h»ii;, with tiu! ventral iiiar^iii less curved, the
posterior ♦•iid more evenly roiinded willi only a sli^^lit indication of ji
superior anuiihit ion, so that the shell has a pretty re;;ular, narrow ellip-
tical I'oriii. In all other resju-cts, however, it ajiifcs well w it h tlm ordi-
nary form. 'I'his specimen, which receives the varietal iiaiiio .s7//(7/(,
is liji'iired on I'late fiX \ \, lii;. 1.

lieiifilh. ."• mill. : liei;;ht. •! mm. ; lueadth, I.', mm.: length from Iteak
to posterior end. ■"• mm.

f
I

YOLDIELI.A INKLATA Verrill and Hush

(I'l.itrs I.WX. li-;. S; l.WMI, liMS. .-.. (I.)

\nliliii liiridit \ i;i;i!ii 1.. I'lMiis. ( (imi. Ai'.iil., \\, ]>.-''■*, issi 1 jn jmrl.),
]<>l<liill(i iiijliila \i:i!i!ii I, iniil l*>i ■~ii. .\iiicf. .loiini. Scj.. III. |.. ."id, l'n;s. .i. I. II,
.l:iiiii;iry, |S<17.

Shell small, swollen, rather short, subovate, with the posterior end
broad, anunlated jiostero dorsully : beaks al about the anterior third;
surface smooth. Antero dorsal mai<.;in remilarly convex and slopiiiL;
rapidly to the anterior end wliicli is evenly rounded, \eiy olitiise, and
passes insensibly into the evenly eurved ventral margin wliicli is
(U'cidedly convex, althoiijjh tlu^ decree of convexity varies considerably
in dilferent specimens; the p»)sterior en<l is oldiipu'ly snbtriineated,
with an obtnse curve below and an obtusely rounded anjj;le at its upper
extremity where it Joins tlu' nearly strai;ilit postero dorsal marj^iii.
The umbos are full and well-rounded but not Vi'iy prominent; the
beaks are small, directly incurved, appressed to tlu' mai';,nn. There is
no distinct liiimle but the margin is sli<;lilly i>inclied ii|>iii a small crest
both before and behind the beaks. The ligament is delicate and show s
slightly on both shies of the beak, I'liidemiis jiale olive yellow or straw
col(jr; sniliice smooth, sliinin;;', rellectiiifj prismatic colors, sliowiii.
nioreoi' less distinct lines of <>rowtli which .sometimea become refjiil.i'
coneentric, very line striations, especially anteriorly. lliiij;e-mar<riii
well de\eloped, moderately broad and considerably thickened, formin.u
an obtuse anu'le at the beak where it is thin, encroaclnMl upon by tin-
beak and interrupted liy the cartihiji'e pit; tliii two i»ortions are ncMi'y
e(|nal in length, the anterior somewhat arched, the posterior iiciiily
straiji'ht, each lia\in;:" a. thin, smooth border above the teeth, alu^it
equal in breadth to the hiii^'c plate. In the larj^est specimens there
are iiin«' to eleven (most freijiieiitly ten) rather stout, annular teeth imI
about ten vei-y similar posterior ones; the cartilaj^'e-pit is small nil

N(i. tl3l).

i>i:i:rn irri,' Mdi.i.t stA—vi:ui:ii i. asd hi sn.

Sdfi

just IxMifiitli t lie Ix'iik. toiiiis ;i iMttcli wliicli »uiii|(l('U'l\ iiitm iipl > Ilir
lijii^(''liiiu-;;iii.

Leiijitli (»r (die of ilic liirjicst siM'rimciis, «» iiiin.; lM'i;;lit. I..") imii.,
tlii«'kiirss, .'1 mill.; Winn Im-jiIc to posti'iioi aii;^l»', I iimi.

I'oiiikI ill (•oiisit|«'iiiI)l«' iiiiiiiIkts, at aliuiit twciitN stations, hctwi-cn N.
lal. 41 T).) , W . Ion;;. <;:» .;:»'. and N. lat. .\'t '.» .'.(»", W . h.ii-. 71 :.7 Ml ',
in .*»!(» to IjiKi.S fatlioiiis, l.ss;$-l.s,s»;. St-vi'ial live si(t'(;iiiu'iis, at sintion
L'OTO, ill 7r> fathoms.

This .species is closely ri'latetl to Y. Iiitliht (I.nvni . I'miii wliieli ii is
easily separateil by it.s shorter, inoader, nioic .swolh'ii form, its stionuiy
curved ventral marjjin. and \-eiy distinct posteio doi sal aiiuh-. It is
sliorter and has a broader posterior end than most of the related
.species. The resiliuni is not visible externally.

YOLDIELLA SUBANGULATA, new species.
(I'hiir.s I.X.W II. Ii-. ;i: l,.\\l.\. Ii-. tl.)

V<'iy similar to tlu^ prtM'ydinji' species in form Init less pointed po.s-
terioily and lai;;«'r. 'i'he umbos are small, not prominent: beaks are
small, directly iiniiiNcd, appiessed to the hinj,n'inai<^iii bin not dis-
tinctly notched by tin- resilial pit. The iiiitero-dorsiil .uai^iin iscoii\e\,
arched; tlie anterior end is a little produced, obtusely r(»iiiided; ven-
tral inariiin evenly and br(»adly rounded, .->Iij;litly pKtdiiced posteriorly,
forniiii};' an obscure obtuse allele as it meijics into the posterior end
which is obli(|Uely siibtriincated or a little inih'xed in the middle, with
a prominent dorsal aiij^le; the jKisterodorsal niar^iin shtpes inil little,
and is nearly straij:lit, with the compressed educs forming; a slii^hi keel,
w liich is a. litt'e c<»nvex ill the middle. .\ well marked ridj^e runs lo
the posti'i'o-dorsal an;ile, and a less distinct one to the posiero \ cut i al
allele; between these there is a slijuht depression of tlu' surface. Sur-
face nearly smooth, lustrous, retlectiiij; prismatic colors, and coNcred
with faint lines of ;;rowtli and a few inconspicuous irregular sulci;
epidermis pale oliv«' yellow. The hiiiu'e inarjiin is narrow, very obtusely
aiifiled, and is intcrriipled under the beaks by the small notcli like
resilial pit. The anterior series of teeth is slij.;iitly anlied and con-
tains about seventeen teeth, including' three lu- four luimilc proximal
ones; the larj^er ones aie hi;^li and sharp. The posterior .series is a
jitih^ loiijicr and contains about ei;.;lilecn, similar, but somewhat more
slender teeth. A tliin, smooth iiiartiin extends alonuoutside bot h series.
There is a small internal denticle at the front edyc of the resilial pit.
Pallia] sinus narrow, considerably intlcxed.

Length, S mm. ; licij;ht, T) mm. ; thickness, about I mm. : from beak to
anterior end, Ii iiiiii. ; posteri(U' end. ;"» mm.

One live specimen was dredj^cd by the lUicln at station l»i, N. lal.
43° 3'; W. lony. 7(P 4', in TA fathoms, 1871.

Proc. N. M. vol. vx 55

[|

IMAGE EVALUATION
TEST TARGET (MT-3)

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Sciences
Corporation

23 > /EST VAIN STREET

WEBSTf:?, N.Y. 14580

(716) 872-4503

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866

riiOCEEDINGS OF THE NATIONAL MUSEUM.

vor,. XX

YOLDIELLA JEFFREYSI (Hidalgo).

(IMiitos lAXXI. fiir.n; T.XXXIII, W'A-"^-)

Lida laia Jkffukys, Ann. Mag. Nnt. Hist., p. i'M. November, ISTfi.

Leda jcffreysi JkI'FRKys, Troc. Zoul. Soc. l.ondon, p. .579, pi. xi,\ r. fig. 2, .Imii',

187!(. — Smith. I'.A., Report Voy. Challenger. Znul. L.iniellibnuichiiita, MM,

p.2:M,18K-..
Not Yoldiajeffreysi Vkrrill, Trans. Conn. Acail., VI. ]i. l!20, 1884.

Shell small, ovate-ellipticiil, soiiiewliat thick for it.s size, rather .swol-
len, covered with a glo.ssy, iridescent, brownish yellow epidermis. Tlie
posterior end is eonsidei'ably the long;er, somewhat narrowed, bluntly
ronnded without any distiiu't rostrum. Umbos rather prominent, sonie-
wliiit swollen: beaks i)rominent, curved inward and backward. Tlie
antero-dorsal margin is broadly cotivex, slopes a little and becomes
continuous with the rather rejiularly curved outline of the roundel
anterior end; ventral margin is broadly and regularly curved without
any distinct ll(;xure; the ])osterior eiul is obtusely rounded and not
delined l)y any radial lines or ridges, with the doisal margin nearly
straight at lirst, usually slightly convex in the middle, and slo|>iii^'
gradually. The surface beneath the epidermis is n<'arly smooth Init
shows more or less distinct lines of growth, which sometimes have the
form of fine parallel striations. The hinge-plate is thickened and
rather strong; the two series of teeth are long and form a very ol)tust^
angle at the beak; the anterior is somewhat the shorter and uioie
oblicpie and a little curved. In our type specimen there are thirteen
anterior teeth of which three or four proximal ones are very small: and
fifteen posterior ones, including four or five small proximal ones; a
somewhat larger specimen has iifteen in the anterior .series and eight-
een in the ])osterior. The two series are interrupted beneath the beak
by a small, well-detined, concave, triangular resilial pit supported on
the inner side by a distinct shelf like projection.

Length of the type-specimen, 5 mm.; height, 'i.l mm. Length of the
hirgest specimen, 5.0 mm.; height, 4,2 nnn.

Six sei)arate A^alves, at three stations, between N. lat. .37'^ 38' 10",
AV, long. 7;P 10' 30", and X. lat. 30^ 42', W, long, 74'^ 30', m 727 to 1,423
fathoms, 1884-1880.

As all of our specimens are much larger than the measurements
given by Jeffreys, they are referred to V.jrffni/si (Hidalgo) with soiut*
doubt, although they appear to agree well with Jelfreys's ligureot'tluit
species in form and in the character of the hinge.

YOLDIELLA LENTICULA (MoUer) variety AMELIA, new.

(riatos LXXX, tig. 'J; LXXXI, fig. I.)

Xitcnla Icufiriila M<)LT,f,k. Ind. Moll. Gid-nl.. i». 17, 1842.

Voldia ahi/KHieohi Tohki.l, Spitzliovfjens Molliiflkfauna, ]>. 14!t, jtl. i, 111:1. t,<i-7'.

18.")9.
J'orlJandia lenlieitht fi, (). Sahs. Molluacji I?ejj. Arcticin Norvogiie, p. ;*!'■ I'l- '.

n«s. 10, a-h, 1878.
J.ida leniivuhi .Ikki'Rkvs, I'loc. Zoc'il. Sot;., London, p. 577, June, 1879.

122

NO. 1139.

DEEP-WATER MOLLUSC A— VEIUi ILL AND BUSH.

IJ-

867

Our speciineiis, which are worn aiul inii)erfect, referred to this north-
ern species, (litter somewhat from the typical specimens from Sjutz-
bergen, received from Doctor P'riele. They are relatively shorter,
higher, and somewhat less swollen, with a thicker and heavier shell.
The posterior end is less produced and less tapered, so that it has a
more ovate form. The hinge-teeth are stouter; tlu^ posterior series is
shorter but contains the same number of teeth in specimens of similar
si/e. With the amount of material that we have for examination, the
differences, however, seem hardly sutlicient to warrant the 8e])aration
of our shells as a distinct species. We tlierefore propose the varietal
name (diihlia for our specimens.

A few separate valves, at two stations, north of Capo (Jod, in 110 to
122 fathoms, 1878-70.

YOLDIELLA FRATERNA, new species.
(Plates LXXX, (ij:. 5; LXXXIl, lijj. 8.)

YoUlia frifjida Verkii.i.. 'I'rans. Conn. Acad.. VI, ii. 279, 1884; P^xpl. Alhntrosn,
IJeport I'. S. Com. Fish and Fisheries for 188H, p. .576, 1885 (in part).

Shell small, thin, delicate, irregularly ellii)tical in form, the posterior
end being a little tlie longer, unusually broad, and slightly prodnced
above, but not distinctly angulatcd. with a glossy, iridescent, yellow-
ish green epidermis. Umbos a little swollen ; the beaks small, scarcely
l)rominent, and subcentral. The anterior end is broad, a little produced
in the middle, and obtusely rounded; the diusal margin is nearly
horizontal in the region of the teeth; distally, sharp, and convex, then
sloping rapidly to the middle of the anterior end. The ventral margin
is broadly rounded, expanding a little posteriorly and then a.scending
pretty rai>idly to the posterior tip which is obtusely rounded superi-
orly; ])ostero dorsal margin slightly convex and nearly horizontal for
the greater part of its length. The surface beneath the epidermis is
marked only by faint lines of growth. The hinge-margin is thin,
rather delicate, with the two .series of teeth of nearly ecpial length and
diverging from the beaks at a broad angle; each .series contains about
ten rather thin and delicate teeth, of which the one or two proximal
ones are very small and rather indistiiu^t. Beneath the beak the
margin is attennated and interrupted by a small, oblong lesilium which
occupies the entire thickness of the margin and a sligiit notch in the
beak. The pallial sinus is relatively rather large ami deep, but in
most specimens is invisible.

Length of the tigured specimen, 4 mm.; height, about 2.1 mm.

A comparatively small number of specimens, at abont twenty sta-
tions, between N. hit. 47° 40', W, long. 47'^ ;$.")' .'{()", and N. lat. .'{7" 8',
W. long. 74" 3.3', in m to 1,008 fathoms, 187;{-188«>.

This is i deep-water form formerly identified by us as YoUlia fritjida
Torell.

II

J

S6S

j'J!()ri:i:j)j\<;s or the xatioxal mvsf.im.

Vdl,. XX.

YOLDIELLA CURTA, new species.

J'lair XCVII, liu-.IS.)

rintscolKn (irahim.' ) \y.\inii.\., I raiifi. (Oiin. Aiiid.. \ 1, ]•.:.','>(), lj<,st ; Kxpl. .(/,'„(//•,/«■<.
Jfi'liort r. S. Coin. I'isli Mini l"i>liiti('s lur \SH',<. \k .")7i>. I."^s5 (not S<\Lriioii/;i i.

Shell sinnll, .><h(n-r ovato, ratluT swollen in tiio middle, with ratliei-
ju'oniiiuMit ninhos, s(»MU'\vli;ir ine<|nil;it('ral. the po.sterior end tlx^ lonucr
and sli};litly produced. I'.eaks .small, inciiiN cd, with a slij^lit i)0,sieri()i'
twifcst and a little .separated from the mariiin. The dnr.sal mar<;iii is
nearly straight medially, both before and behind the beaks, anteriorly
it merj;es ^ladnally into the broadly rounded anterior end, which
usually has an ol)seure, blunt angulation in the middle; ventral nnir
yin broadly and evenly- rounded, nieruin;^' iiradiially into the more
abrui)t cur\e of the posti'rior eml whieh is a little tapered, but obtusely
rounded without any disl inet rostrum or anj;ulal ion : the ])ostero-do!sal
mary,iu is a little ])rominent. pinched u}) and (;onvex, with a considera-
ble slope, so that the ti]* of the shell is but little above the ndddle.
The surface is polished and somewhat iridesi-ent, marked only by line,
irreiiular lines of growth. Mpidernds i»ale greenish or browiush yellow.
There is a lelatively very large resilium. ai)pearing yoke-shaped or wide
W-shaped in the separated valves, and co\ering' a relati\ely Ion::.
e(h'ntulous spa«'e beneath the beaks. The teeth are compressed,
oblique, imperfectly V-shaped, especially i)osteriorly, and but slightly
elevated. There are six or seven in the posterior series, of which the
])r()\imal ones are rather indistinct ; ami four distinct and two or three
indistinct ones in the anterior series. In a dorsal view live are visible
aboM' the margin behind the beak ijud four before, i'hey are not very
long and rather blunt, with the distal side sloping and the side next
the beak a little incur\e(l and concave.

Length, 2.<I mm.: lieight, l.S mm.; thickness, about 1 mm.

A few live specimens, at three stations, between N. hit. -H 11' .!()",
AV. long, dtp 12' 20". and N.lat. .',!) ;5S', W.long. 70 21". in l!M» to l.L'lKl
fathoms, 1S83-1S80.

This species somewhat resendjles V. frhjida in form, but it is rela-
tively shorter, higher and less distinctly rostrated. Its hinge is also
<iuite dilferent. The [iresent sjw -ies is peculiar in ha\ing fewei' and
blunter teeth and a much largt ; resilium than most of the related
sj)ccies.

YOLDIELLA PACHIA, new species.

Slu>ll very broad, o\al. consideiably swollen in the middle, with the
length and height m-arly eipnil; nnd)os rathei' prominent. The poste-
rior end is narrowed and slightly produced, but n(»t defined by any
groove or cariimtion. '^^riie dorsal nmrgin is Ncry obtusely angidated,
anteriorly it is convex and slopes ])retty rapidly to the broadly antl
evenly roundetl anterior end; posteriorly it is nearly straight at (irst,
then sloi>es gradiuUly to the posterior end. The ventral margin is \erj'

i

NO. unit.

i>i:i:i'-u ATi.i; mdiiisc t ~Ji:i:i;ii.i. .im> i;rsn.

SCO

1 tin; idly rniiiidi d and sli^litly prod need in tlu' middle; it jnins lli(> ciii'vo
(tf the jtostcrior end willi ;i scarcely perceittilile incnr\ atiire in sdiiio
speeiinens: the jKisterior end is ctlttnsely I'onnded and sitnated about
liiidheiyht (tf the shell. The ditrsal eddies ol' the vahc are thin ai it a
little |tinched up, but there is no distinct liinnle and oidy a very nar-
row liin-anieiital I'uirow. The epidermis is polished ami somewhat iri-
descent. a:id marked with line, somewhat irregular lines ot' yi'owth, in
some places showin^- faint, ndcioscopie. I'adial striation:.. (\tlor oT the
dead \al\es. Inow nis'i yellow. II iii^'e plat«' stroni;. narr<iw near the
beak, wide di.vtally. siron^ly angled, wiih tin- (tnter edue naked and
rather broad. es])eciall.\' anlei'orly. Teeth laruc and promiiiont <lis-
tally. with about three small jtroximal (tnes: about eiyht in the ante
rior and ten in the jiosterior series. The resilial pit is a distinct,
triaiiiiular tbssetle. or ('iKtinlrophore. on the face of the inaruin. eover-
ini; its whole breadth, and bordered internally by a thickened edi^e
whi<'h causes an e\cur\ature of tiie margin. There is a distinct iiiar-
<;inal external ligament and furrow, or esciittdieon.

Len<ith. 4.(1 mm.: heifild, I.S mm.

Three sejtarate vahcs, ani<tn,i;' l''oraiiiiiiifera. at stati(tn I'.'kSr), N, lat.
28^ "(1, W. loii-i-. SS IS , in 7;>(» fatli<ims, ISS.1.

In outline this species resembles Y. cinfd, hut dilVers in its wider ami
stouter hin^i' ]tlate. more numerous and imtre hij^hly developed teeth,
and especially in the form and structuie (tf the resilial pit.

YOLDIELLA INCONSPICUA. new species.

d'l.iti' i.XMX. fiu's. :\. r..)

Shell small, thin, delicate, citmpresst'd, suii<t\ate: jxtsterior end a lit-
tle produced and narrowed medially. Surface lust rctus and iridescent.
I'mlKts scarcely pntmineiit ; beaks small, itrttject inu' but little above the
ditrsal inariiin. The antero-dorsal mar.inin is slightly convex and nearly
hori/.oiital at tirsl. then sIo])es .uradually t(t the e\enly rounded anterior
end; vt'iitral mar,uin broadly ntunded, slij^'htly swollen jtosteriorly,
aseendiiifi' more rapidly t(t the narrow and bluntly rounded posterior
end; jxtstero-dorsal maruin m'urly straijiht toward the beak, then
sliiilitly convex and slopiui;- very j>radually. The surface is covered
with line, pretty re<iular. concent rie <;ro(t\es iind laised lines, visible
only under the niieroscope. J"4 ideriuis thin, shininj;. iridescent. j>reeii-
ish yellow. The hin.uc-marji'in is tlun and delicate, nearly straiji'ht; the
two series of teeth form a very (tbtiise aiijjle at the beaks ;ind are
interrupted, for a e(tnsider;ible s|)ace, by the resilium which does not lie
in a distinct pit. The ligament shows as a delicate, contiiuious mar-
;.:iiial line, both in front of and behind the beaks. The teeth are small,
obli(|ue. V-shaped. In the anterior series there are about six <listiii('t
ones with one or two minute i»roxinial ones: in the posterior, about
seven distinct ones with one or two riidiiiientar\ ones near the beak.

870

pn()ci:i: DISCS nr the xattoxal ^^rsEf'^f.

VOL. XX.

Tbe pallial sinus is latlier wide iuul moderately dee]), but is invisildc-
in most si)eeimens.
Len<;:th of the laif^est specimen, .^«1 mm.; lieiyht, U.3 mm,
A number of specimens, at about lif'teen stations, between X. lat.
42' ;W, W. lonji. (i!>^ 5S.r>', and X. lat. .{"i^ IL" W, W. lonji. 71 ' .57' 15",
in 100 to 70a fathoms, 1878-1 8S().

This species is distinguished from YoldidUt fr'ujUUi, and most of the
other snuill sj)ecies which it resend)les, by its narrower, or lower, and
more comi)ressed form, more delicate shell, straij;hter dorsal niarj,Mn,
and the more central prolonjiation of the posterior end. It is appar-
ently more nearly i-elated to the smalh'r sjn'cies, )'. miniiscKla, than
to any other. The latter has a smaller, shorter, and nur-e swollen
shell, nu)re conv'ex ventrally, with the hinye niaryin somewhat nioie
anyulated.

YOLDIELLA MINUSCULA, new species.

(I'lat.' I. XX IX, li-iH. L', 7.)

Yohlia jeffrcijm Vkkimi.i,, Trans. Coiiii. Acad., VI, pp. L'L>9, 127!t, 1S8I ; E\))l.
AlhatrosH. Kcixnt IT. S. Com. Fi.sli inid I'Mshciics for 1><S;{, p. 57t>, lf<S.-i.

Shell nunute, broad-ovate, (covered with microscopic, i)retty rej>iil:ir
concentric striatious, with a very lustrous, souicwhat iridescent, yel
lowish epidermis. The two ends are nearly ei[ual in length; the
posterior soinewluit narrowed and obtuse at the end, the anterior well-
rounded. The umbos are not prominent and the beaks are very small
and project but slijjhtly above the uuirgin. The antero-dorsal unujiin is
slightly convex at lirst, and nearly horizontal, and passes j;radiially
into the curve of the anterior end; ventral margin is broad and nearly
uniformly convex; the posterior end is a little produced in the niiddlc
and forms there a slight obtuse angle; the i)ostero-dorsal margin is a
little convex and nearly horizontal at first and then sloi)es rather
rai>idly to the tip. The hinge-margin is thiji and delicate; the two
series of teeth lie nearly in a straight line but the anterior one is a
little obli<iue, so that they form a very wide anp-le at the beaks where
the resilium entirely interrupts the hinge-nnirgin forming a wMde notch
without any detinite pit or shelf; the teeth are small, very obliijue. and
only slightly i)rominent; there are only about live in the anterior and
six in the posterior series.

Length, about 2.3 mm.; height, about 1.5 mm.

Oidy a few specimens, at four stations, between X. lat 41° 53', W.
long. 05° 35', and X. lat. 38° 27', W. long. 73° 2', in 705 to 1,2!tO
fathoms, 1883-1885.

This very minute species may, with a larger series, prove to be tlie
young of some of the x)receding species.

NO. 1139.

l)EEP-]VATKli MOLIASCA—VlAiUlLL AM) lllsll.

871

YOLDIELLA SUBEQUILATERA (Jeffreys).

Lvda siib<<ii(il(itn(t .li:i 1'1u:ys. I'loc. YauA. Soc.. Ldiiduii. p. ."iTi'. ]>\. \i.vi. ti<^.

M, IST'.i.
)i>lili<i .s(ihf(iiiil(ilci(i >'i;i:i;ii.i., Ti-.tiif.. Cuiiii. Aiad., \ 1, pp. lil'ii. I'Tl', l^M vi" I'aiti;

Hxpl. AIIkiIids.s. h'cpurt r. S. ('iim. Fish ami I'lsherirs lor iNS;!, p. .'iTtl. IS'^S

(in part).
I.fdii siiheiiiiihilrnt 1>.\I.I., Hull. Mils. Conip. /.oiil.. MI, p. L'.M', ISSt;,
loWia xuluiiuilalcni l».\i,i,. I'.iill. l'. S. Nat. Miis., No. liT. ji. II. ISSii.

Several live .spccinu'iis (No. .■^5204), from station 'JOM. N. hit. .'is^ .~»;j',
W. long. (>!»o U3'30", in 1,7;U tatlioins, 1S8;{, have been relVrred to tlii.^^
species. Although younger or sni.iller tlian .IctVicys'.s type, they auree
very clo.sely with his tijiiire.s and (U'scription. The shell is very small,
very thin ami transparent, polished, lustrous, but scarcely iridescent
and marked only by micr()scoi)ic lines of <irowtli. It is rather com-
pressed, nearly ellijitical in form, with the beaks ])rominciit above the
dorsal maryin and turned almost directly inward. I'oth ends are
obtusely rounded and nearly equal in len.i:th. so that it is impossible to
deternune which is anterior and which is posterior by the external
characters; one end, supi)osed to be the anterior, is however sli^litly
broader than the other. There is mi distinct liuament visible externally.
The hiuye i)late is nearly straight, the two series of teeth forminji- but a
slight angle. Interior not seen.

Our specimens measure from I.."* to -.."• mm. in length. South to
Grenada, in 1)2 fathoms. — Dall.

YOLDIELLA EXPANSA (Jeffreys).

(Plato \('\Il, li.i,'. ;{.)

Lrda cxpatisa .Ikkfki'.ys, .\iin. Mag. Nat. Hist.. ]>. ISl, NoMiulnr. ISTO; Proc

Zoi'll. .*<u(r., London. ]i. .'iSO. ])1. \i,vi. lig. 1. .Inn". ISTt).
Not Volilia iJiKDiKd \ v:\iHiLi., Trims, ("onn. Acad., \\, ]^.'2'iiKlSSi.

Shell oblong-ovate, nearly eipiilateral, with the posterior end a
little more broadly rounded than the anterior: both regularly obtu.se.
Both dorsal margins are slightly convex and slope but little. The
hinge-plate is moderately wide, gently arched, witli sharj) doisal
margins, and is completely interrupted in the middle by a (U'cp,
angular notch for the resilium which is rather large and dark and is
attached to the inner surface of the shell below the beak. In the right
valve, there are uineposteriorteeth,includingoneor two very small ])rox-
inuil ones, separated from the margin by a rather wide, smooth space;
those in the middle of the series are long, wit ii tapered, acute tips which
are bent upward aiul toward the beaks, and at base aie V-shaped.
In the anterior series, which is a little the longer, there are ten teeth,
including two or three very small, proximal ones; the larger ones are
nearly erect with the tips less inclined than those in the i»osterior scries;
they are separated from the margin by a plain space about as wide as

< I

:

t

872

n;(>(i:i.])i\iis m- rni: y.irioy tr .vr.s/.TU.

vnr.. XX.

the tcctli. Til tlui left valvo, tlirro iirc clcvoii iiiitoiior :iii(l nine jm),s-
terior ttM'tli. Tlie siirfiu^o of tlic shell is dull ycllowisli j;rc<ii, only
slightly iridescoiit. iiiul covt'icd with irri'^uhir lines of {"fiowth whicli.in
sonu' pliices. form irrej-ular raised lines. The iiiubos are but liirle
proiniiiont: tlie beaks are small and turn baekward.

Leii^i'lh, .■'».<• mm.; lieiyhl, 2,r> mm.

One spei'imeu (Xo. 7S;?(;;5), station 2(107, X. lat. 47'^ !(»', W. Ion--. 17
3.'.' :',()", in 2»»(! fathoms, ISSC.

This s](e<'ies is pt'ciiliar in its nearly equilat(Mal. elliptical form, with
the dorsal marj-ins ficntly eoiivex and only slightly sloping- botli sides of
tlie beaks, and especially in its large resilial notch which cuts entirely
thnm^h the liinge-plate. Tt aj^rees pretty closely with .lelfrey^" lypi'.
but the latter was much smaller and his (igures ami diaj^nosis ar«' too
imju'rfect to make its identity certain.

YOLDIELLA FRIGIDA (Torell).

(I'ImIc 1,XXI\. liu. I.)

Yohlia frhjithi Vi",ni:ii,r., 'I'raiis. Conn. Acad.. \. ]i. T)?;*. ]>1. M.i\ . fi<j. 2, ISSH; \ I.
p. L'7!>, 18SI (i7i part); F:<|il. .Ulxilroxs, ]ic]>i>Tt I'. 8. Com. Fi.sli and Fishrrics
for 1SS3. ]). ."(!, 1S8."> (in i)art).

A very few specimens, at about ten stations, between X^. hit. 1"> .'. .
W. long. H) ll'.'JO". and X. lat. .'«V^ :>;!' ;?(>", W. long. 71° I.'IT.O", in ss
to :U2 fathom.s, 1874-18S1.

I

NO. 1 1

The

YOLDIELLA DISSIMILIS. new species.

(Plates LXXVIIT. iiii'. S; LXXXII, )!«. 7.)

Yoldia expanm ^'KUlaLr., Trans, ('onii. .Vcad., \I. p. I'TH. 1S81 ; F.xpl. AJhatmss, i;,..
l)ort U. S. Com. Fish and Fisheries Wiv IS8'i, ])..'i7ll, 1S8.") (not of .TeflVcy.si.

Sbell small, oblong ovate, nearly equilateral, with the anterior end
the broader .and bluntly rounded, the jiostorior end somewli.it narrowed
medially and bluntly rounded, -witlioutany distinct angulation. I'mbos
somewhat prominent; beaks small and strongly incurved. Surface
straw-colored, not lustrous, covered with line concentric lines. Aiitcro-
dorsal margin but little curved, sloping very gradually to the anterior
end which is curved nearly in the arc of .i circle; ventral margin very
broadly rounded with a very slight obtuse angulation behind the mid-
dle: postero-diU'sal margin slightly excavated Just behind the beaks,
then sloping very gr.adually to the obtuse posterior end. The hinge
margin is moderately stout; the two portions form a very wide angle
at the beak with the anterior, which faces obliquely downward, cousid-
er.ibly the more arched. In the center the margin becomes very thin
and is interrui)ted by the resilium which occujiies a deep notch and an
internal shelf of considerable size, situated far back and directed down
ward to such an extent that it is only partially visible in a direct front
view; there are about eleven or twelve anterior, and eight to ten jiostc-

Nc. ll:t!).

/ > !■: i: I'-ii'.i Ti: /; .1/ oi.i.isic.t-i Vv /; A' / /. /. ,t sit n i sir.

873

I

ii(»r acuti', (Miivt'd, V sliiipcd trctli; iit the inoxiiiinl end of tlic posleriitr
s(Mios, in the left Viilvo, thorc is an oldoiiji', inondiitMit, tootli IMu' inocess,
niucli laij^er than tlM> adjacent teiitli. Tlircc or I'oiii of tlicdisial ttctli.
on cacli side, are decidedly Iar<i'c, prominent and acute witli the tip
curved outward, hut the si/.e (U'creases rejiuhirly towai'd thi' center.
Tiiere is a well (h'velo]»cd daric li.uanient. visihh' externally. l>otli hrlore
and hehiiid the beaks. The surlace is coxered hy i-elatividy rather
hirj;e, distant, concentiic lidj^cs and liiirows, easily visihle under a lens,
which are e\ery\\licre covei('<l hy very r«'jinlar niicr(»sc()iiic lines and
•grooves of about eqiuil width.

l-eniith of the laruest valv«'. 4.L.'."> mm.; hei.uht, L'.s mm.

A lew specimens, at four stations, between X. hit. 3!) 4!t'. W . lonj;. »iS''
L\S' ;iO", and >'. lat. 3(Jo 47', W. lon^-. 73^ «.»' 30", in l,i:.l to l,(;s.". fathoms,
l.SS3-18S().

This species is remarkable for its oblonp-ovate form ami very regular
concentric scnli)ture, consistinji' of fine ridjjes and furrows which are in
turn evei-ywlierc covered with regular nncr(»sc.opic lines. 'I'liis s]»ecies
was at lirst thought to be Y. r.iiKtiisn (.fellreys) which it reseiid)les in
form, but additional specimens and more careful study show that tlic^
spe<aes are very distinct. In Y.<'.>'iniii.sn the hinge-margin is much
straighter, tiie teeth fewer and diiterent in form, the resilial j>it very
different, the two ends of the shell more nearly eipial. and the scul])-
ture (pute different.

Our specnes differs considerably from the typical forms of Vohlitlla
in having a more obh>ng form with both ends evenly rounded, a well-
developed ligament, and a nM)re evident resilial fossette or chondro-
l)hore which, however, is situated decidedly below the hinge plate.
The existence of a peculiar tooth-like process adjacent to the resilial
notch would be a (dsaracter of considerable imi)ortauce were it con-
stant, but the s])eciinens show great variatiou in its development : in
sonu% it is even almost abortive. These distinctive characters, although
important, seem hardly worthy of generic <listinction.

MALLETIA Desmoulins, 1832 (restricted).
MnUet'ut \'i;i;kii.i. and in'sn. Amcr. .Ii)urii. Sci.. HI. i»]i. .")(!, dlJ, .lamiary, lSi)7.

7)/jf>c. — Mdllctid rliilensis Desmoulins.

We have restricted this group to those species having a nearly
smooth, somewhat compressed, oblong or elliptical shell, blunt pos-
teriorly, without any definite rostrum or carination. The carinated
and rostrated species that have been placed in it will thus be referred
to XciJo IT. and A. Adams. The resilium is wanting, or else represented
by a special part of the ligament, external to the teeth. The ligament
is well developed and prominent. The sii)hon tubes are long and
united nearly to the tips.

874

Pi{ori:i:inxt!s of the s.itio\m. Mrsi:j\T.

vol.. XX.

NO. 1 1

The subgenus rscudiimnllrtio, i)r()i»()sod by I'ischer for .1/. ohtxsa, wjis
based on an erroneous description ol" the siphon tubes.

The Ibllowinf; arc soiiui of the known species:

.)/. cliilftiNis Dcsnioiilins, \'ali)araiso (Type); M. ohtnsa (Sars) Miireh,
from oir Cape. Fear, North ('arolina, northwanl; M. polita Verrill and
l5ush,ofV Delaware Hay; M. ahi/ssDruin \'crrill aiul Hush, oiV ('hesa
pealve Hay; .1/. cunvdtn JelVreys, Xortii Atlantic; .1/. jKillithi Sinitii.
]\rid South Atlantic; ^1/. <nnn(((iia Smith and M. tlunkcri Smith.
I'acitic; and .1/. hclhtrdii Se;j;uen/a, fossil.

MALLETIA OBTUSA (M. Sars) Morch.
(I'liitc .XCVII. lijjc. I.)

Yohiiii obtiisn G. o. S.xHs, I>oiiiarl<al>lt' I'mm.-* <>f ATiiiiiiil liifc, p. 'Jli, pi. ni. tiii.s.

lti-'_'0, ISTL'.
MaUitUt ohtitKii (i. (). Saw.-;, .Mollii.sra. Ik'fi. Arctici' NOrvej^ia-, ]». 41,pl. 11). )i>rs.

;{,«-/<. 187S. — .ll'.lKUKV.s, I'loc. ZoiU. Soc. I,.»ii(l()li. ]). r>S(;, Juilt). ISyit. — \'|.;i;-

KiM., I'raiis. ('.mil. Acad., \I, i)p. l-'l'd. liSO, ISSI; V.\\i\. .tlhatioHx, l.'.'iiort T. s.

Com. Fish and I'i.slnMios Ibr 1SS;{. p. ."»7(i. 18S,'). — SMnii. K. A., K't')><)it \'(i\ .

Chathiiiio; '/.olW. Laiindlilpraiicliiala. XIII. y. 21,"., ISH-).— l).\i,i„ liiill. l". S.

Nat. .Mils., .No. :{?, p. 4t;, ISS'.t.— lUsii. IJiil. Miis. Coiiip. Zo.'d., -Will, i).L':;i.

18!W. — l.oc.viti), C'aiiii)a,i;iio dii (andan, .Viiiialcs do rUuivcrsitc^ dc l.yon,

]>. I'OL', IStMI.— N'kkuii.i. and lU >ii. Aiiicr. .Imiiii. Sci., 111. ]i. 57, tig. it, 18it7.

The soft ])arts of .several specimens, rather ])oorly preserved in alco-
hol, have been exandned. They have a large foot with an ovate disk
l>ointed in front and minutely crenulated. The 8i])hon tube is ratliei'
long and slender, in some cases uot entirely retracted within the shell;
it appears to contain both the branchial and anal tubes which arc
closely united (juite to the simple tips; at the inner base, there is a
well-marked siphonal septum. The gills are small, elongated, pointed
jwsteriorly, and have the structure usual in the family. The pali)i arc
rattier large, elongated, with revolute nmrgins; the ])alpal tentacle i.s
very long and slender, and in the contracrted state variously bent witli
the edge nuich convoluted. No pidlial tentacle was found at the base
of the siphon.

In our collection there is a large series of this species; the form is
pretty constant and in ne;irly all cases is more oblong than the iuiro-
peau species, as figured by (I. O. Sars. The snuill specimens are com
])ressed while the large ones are a little swollen. The umbos arc
small, but slightly elevated; the beaks are very small, turned directly
inward, and are almost in contact with the margin, so that they arc
generally worn away in the larger specimens. Directly uiuler, and
l)artly in the beaks, and also cutting more or less into the thickness of
the external side of the hinge-margin, there is a small notch, or shallow
excavation, which is occupied by a special portion of the ligaiiiri.l
that probably represents a remnant of a degenerated re.siliuni. T!u'
true ligament is well developed and pronuneut for about one-hall I'a-
length of the hinge-margin, then becomes abruptly thinner and luu-

row

itse

teet

in tl

rior,

thei'

mar;

insi(

thi>

the

direi

strai

cui

Tlu

post

e.\])i

mar;

sinu

shel

exte

with

■■■i

N(i. ii;ii).

ni:i:r-i\ trii,' Moi.i.rsc \~~] ir.uu.i. am, hi sii.

sTf)

I

t

rower; its jjroovc is narrow aixi iiicuiisiticuoiis, 'I'lio liiiiuo inarjiin
itscll' is ratlier tliiii and brars very numerous, erect, V siiaped. acute
teetii which number, in tlie iar^a; specinu-ns, aboutsixteen or seventeen
in the anterior series and about thirty two or tiiirty three in the poste-
rior, inehidinj,' a nuinbei' of small proximal oiu's; beneath tlie beaks
there is a sni(K)th, edentulous space, often a liltle thicUcncd ;it I he inner
margin aiul projecting a little inward in the middle, and rout inuin;;'
inside the series of small proximal teeth on each side. In some cases
this thickeiu'd border seems to arise anteriorly and t<» pass under
tlu^ i»osterior series, as a sli^^ht Ibid: iu other cases it 's continued
directly from (uie series to the other. The posterioi- series is nearly
straiji'ht and about twii'e as lon<;- as the anterior which is strongly
curved and distally somewhat rec-cdes from the thin dorsal inar;4iu.
Tlu^ anterior eml of th»' shell is lather short ami e.enly rounded: the
posterior is about twice as lonj"-. a little wider owin;>- to a slight ventral
expansion, comj)ressed and obtusely lounded or subtruncated at tiie
murjiin, but without any distinct earination or anuulatiou. The pallial
sinus is very broad and deep, extending;' nearly t(» the middle of tln^
shell. The inner surface is smooth, white or }«rayish white. The
exterior is smooth, except for the delicate lines of jirowlh, and covered
with ii thin, brilliantly iridescent epidernns which, in li\»' specimens,
is pale yellowish liieen, but in dead valves is pale straw color.

Our larger s])eciiuens measure about ITxtr Id mm. in lenuth and !• or
9.5 mm. in height.

Found at many stations between N. hit. 41'^ 28', W. lonj;-. »!,'» ;>.")'. and
N. lat.350 1(5', \V. lon<,^ 75° 2' 30", in old to 1,781 fathoms, 1S83-18.S7.

MALLETIA ABYSSORUM, new species.

(flat I" XCN'II, lij;. 7.)

Shell small, not much compressed, lustrous, iridescent, subovate. unt
gapiu{^, decidedly iiieiiuilateral, with the posterior end the longer,
broader, obtusely rounded, Avithout any distinct rostiation. rnd)os
rather pronnnent, rising above the outline of the dorsal margin, with
small beaks turned backward at the tip. Luiuile and escutcheon aboi-
tive. The short antero-dorsal margin is slightly eoneave, and slopes
rapidly to the slightly angulated anterior endj the ventral margin is
very broadly and evenly convex, the eiirvature receding somewhat pos-
teriorly, so that the greatest height of the shell is somewhat back of the
nuddle, ])osteriorly there is a slight extension of the vd^x^' corresj»ond-
ing to an indistinct radial ridge; the posterior end is very broad,
obtuse, not angulated, with the dorsal nuirgin nearly horizontal, slightly
convex, compressed and fornnng a slight angle whcie it Joins the poste-
rior curve. A very slight groove dclines a very faim escutcheon, along
the edge of which the teeth can be seen through tln; substance of the
shell. The surface is polished, brilliantly iridescent, and is nuirked by
faint, raised, concentric lines, or ridges parallel with the lines of growth j

I

f

STH

rnnci'rfusus or riii: x.\rin\.ii. McsriM.

\iil., W.

\

lU'iir llic vcntriil niiiri;iii tlicsc liccoinr iimic clcv iitcd. clciiily (Iciincd.
iiiid iir(^ sc'inii;il«'il hy wider, sli^litly coiiciivi^ j^roovcs. 'I'lic lnii;;(' pl.iti'
is liitluT tldii ;iiid driiratc. r(';4iilinly ('iiivcd. witimiit. any aii^lc at tlic
lu'aks, witii the uosh'iior purtioii ('(>iisid('ral>ly fiic loiuor, 'riicic is a
small, iiH'diaii. s|K'('iali/<'(l li<4aiiu'iil w liicli (tcciipies a lunate, or nearly
scMiicircidai" noti-li in the Iiinj;«' jtiatc dirocfly Ix'ncatli (lie beak, wliich
docs not extend llironijli its entire widtli altlionfjii it is here <|nite n:ii
row. The ])osterior liuaunMit is ]>retty well developed and extends
I'roni llu' heali. wheie it is ('los«'ly eonneeted with the median portion,
nearly to the distal end of the series ol" teeth, and oeeiipies a distinct
nnnjiinal j^roove; the portion nearest the beaks, opposite tlie snndlo
teeth, is thicker and darker colored than the rest and projects sli«>hily,
in SI dorsal vi«'w: a delicate, in('ons])icuons jwntion continues a little in
front of the beak, in a thin jji'oove. The median portion of the liua
nient is so closely connected with the posterior portion that it appears
to be a specialized. thicken<Ml ])ortion of it, but is evidently honioloiiuus
with the resilium of other ji'enera; it is sitiuited, however, outside the
series of teeth iiiid must scr\'e as a lifiainent. The hirjjer te* th are deli-
cate, subacute. V shape, compressed in a direction ]>arallel \sith the
<l<»rsal mai'uin, with deep pits between them. Tlu're are al)ou( ten in
the anterior series, indndin;;' three or four, veiy .^mall. scarcely raised
ones next the beak ; and fourteen in the posterior series, of which tiic
seven distal ones are decidedly lar,uer than the rest, the tenth to tlic
thirteenth beiuff tlie largest; about four, next tln^ ])roximal end ot the
series, are like small, rounded tubercles or y:ranules without a V shape
foiin; tbllowinii' these are three of int<'rmediate form, increasinii' in si/c
<listally. the seventh beiu<;" moieorless V-shajJed; these smaller teeth
fbi'm a series alonj; the inner ed<;e of th(^ liin{>e-i)late. iVu edentulous
rid ;;e, about as lonu' us the space occupied by the tirst three teeth.
extends from the lirst tooth to the liyaTuent pit and is continuous with
a similar, thinner ridj;e rauninj^" below the ]i<:ament-pit to the anterior
series of teeth. The ])allial sinus is of nu)dera*^" size and triangular in
form.

Length. 5 mm.; height, 1 mm.

One live specimen (No. 5-159), statiou 2506, otf Cliesni)eake r»ay. in
L*,(}li() fathoms, 1885.

\ \

ve\,

tow a
lowe
dors;
unev
little
and
I ear
shai I
n)al
being
beak,
mar
teelh.
line
I,ei

( MK

in 1,5

MALLETIA POLITA, new species;

(I'lMte 1,.\XXII, li-r. 10.)

Shell of moderate size, irregularly ovate, somewhat swollen, the ven
tral region convex and the iiosterior end somewhat produced with a
short rostrum. l"]pidermis light yellow, lustrous and iridescent. I'lnltos
not i)rominent, beaks small, strongly incurved, only slightly elevated
above the margin. The autero dorsal nuirgin is slightly convex ami
8ioj)es gently to the short, obtusely rounded anterior end wlii<h is
slightly augulated in the middle; the ventral margin is strongly con-

No 11:10.

J>i:i:r-w\ri:i; Mni 1.1 scA—yniunn t\n nrsii.

877

v«'\, ii little i»i()»lnc(Ml in tlio iniddlf. :m(l with u sli<ilit iiu-urviitiiro
toward tlir jtostciior ciiil, below tlic rostrum; the posterior end is iiar-
rowc'd and produced into a .short obtuse rostiiini wiili a nearly straight
dorsal niarjiin. Tiie surlaee is eo\eied with i;itli<'r line, somewhat
uneven, eoueentrie lines and undiilalions. The hi nyc margin is but
little thiekeni'd ; the anterior pttrtion is the shorter and I lie m(H(' curved
:nid torms a veiy obtuse an;^le with tlu^ [)osteri(U' portion whicii is
1 early straij;ht. Tlu're are about twelve eonspi(!iu)Us, rather elevated,
shaipteetli in the anteriiu- series besides thii'e or four minute, proxi-
mal fUies: and autre than twenty in the [losteritu' series, the nuudiei'
Ix'in;^ iiMletermiiialde owin^' to an injury to the margin close t(» the
beak. The external li^iHuent is lar;;*': and <'onspicuous and (»((;upn's a
umrjiiual ;;i'oove evteinlin;;' the entire, length of the posleri(U' sei'ies of
teeth. Tliei'e ai)pears to Inive been no chondrophore but whether the
line of teeth was coutinucuis is uncertain.

Len<:th, 1 t.r» mm.; height, !• mm.

(Mie valve (No. 7S!>72), station U718, N. hit. 3S^ ,'!/, VV. lony. 71 r»!3',
in l,o(i!) fathoms, bSSi;.

NEILO Adams, IS' ' .

\(ilo II. . '.1(1 A. Ada.ms, (icinrii <»(■ licrtiit MnlJiLsca, II. ,,. T)!!'; Ill, pi, ( wvi,
1ij;s. i, 7a, 111, iS'tS. — \ lauuia. lul liisn, Aiiier. lonni. .Si i., Ill, |i]i. 57. (JIJ,
.liuiuaiy, lS!t7.

Tjiin;. — \tiJo cuiniiif/ii Adams.

The type species of this jienus has an oblonji' shell, with a strai;;ht
postero dorsal margin and a well (U'fmed rostrum, bounded beneath by
a proiKumced furrow and a nuir.uinal indentation, while more veutrally,
the margin protrudes somewhat, the i)outiii<:f of the marjiin eorrespond-
iiio with special lobes of the niarjiin of the numtle. .V. cKinlHfiii from
New Zealand is <H)nc«uitrically •••rooved, but \. (jimiurn (l)allj' from olV
the coast of laauuhu' is smooth or nearly so.

NEILONELLA Dall, 1881.

ISaliiru'ta Si'.(HTN/..v, Niiciilidi ti r/.iaric iiiciid. d" Ital., K. Accad. I.inici, 1. p. 117^,

1S77 (iKit Silirank, ISOl').
Lvda (srction Svilntnlhi ) l).\i.i., UiiU. Mius. Coiiip. Zoill., I.\. ji. llTi, ISSl; .\II,](.

L'r>i. iss(;.-|->'((/(/;»i« Dall, ]>.!'»);!.

NeihmtUa Nkioui.i. and licsu. Aiiut. .Iimni. St i., 111. pp.;")?, (JI!, January, IS'JT.

'rupc. — NvilomlUt i'orpulcnta Dall.

Shell small, swollen, short-ovate, with both ends obtuse; the poste-
rioi- somewhat the longer, blunt at tip, without any distinct rostrum
or (carina. Exterior usually eonceutrically grooved. Ligamental area
not deliued. Ueaks usually promiiuuit ami tur;'-'d inward and slightly
backward. Ligament well develope<l, extending under and before the
beaks in a distinct groove, nu)re piomineut behiiul. liesiliuin very

'Dall, Proe. V. S. Nat. Miis., XII, p. 251, pi. x. tig. 10, 1889.

i

«■

878

rnocFi'Dixcs or the XATroxtr. ^rr^sl■:[■^^.

vm,. \x.

miimt«' or iiciuly aboi'tivo, oc('iii)yiii^' a sliylit notdi in the dorsal
iniir<:iii uiidcr tlio boak, external to tlie scries of teetli, wliicli are inter
rnptiMl only by a small, tliin edentulous space. Pallial sinus small.
Siphon tubes short. Labial i)alpi hu'fje, broad, crescent-shaped, with
lonj^ tentacular apptidajics. (iills small, tritpietraL

We consider tliis ^roup worthy of generic rank, ltap})ears to l)c
nutre nearly allied to Malhtia than to Yoldia or Lcihi. We can find no
ji'eneric chara<'ters to distinjiuish Hall's ty])ical species (X. co>7>»/r;//,/)
from X.pu.sio, which was tlie type of (he section, iSdtnrnia^ projioscd
by Sej^ueuza. They ajiiee closely in Ibrni, external sculi)ture, arrani^f
ment of the teeth, and structure of lifjanuMit and resilium. The name.
Safiiniia, beinji' preoccupied by Schrank, 1801', we have adopted Dall's
name for both of his s(>ctions.

Tiie following sjx'cies appear to belonj; here:

X. corindeiitd Dall (type), and X. <iii(t(lraiu/iil<(ris (Dall), West Indies;
y.Nericc<( (.lellreys), Ireland and IN)i'tug:al; X. ;>/^s•/o (Philippi). Mcdi
terranean and West Indies: X. siiltorafa Yerrill and liusli, fiom dtl'
Cape Ilatteras, Xorth Carolina, northward.

NEILONELLA SUBOVATA Verrill and Bush.
(Plates l.XXX. \\'^. 10: I.XXXU. liiiH.:i. I.)

Yohlia sericca .Ikkkkevs, var. strioliila N'KHiiii.i., TrMiis. Coim. Acful., \'I, p. L"_'(i,
ISSI.— \ Knijii.r., I'n])!. .(/ftrt/nw.s, ]^•|)ol•t U. 8. Com. Fisli .•iiid I'islicric- lui

iss;{. p. .-.Tr). iss.").

Xrilonellii xiihorala Vi:i;i{ii.r> and lirsn. Aiiicr. .lonrii. Sci., III. ]>. 57, lij^s. 7. s, L'-,
.laiiiiai> . I SI 17.

Sliell somewhat swollen, subova'te, with the dorsal nmrjjin anj^ulatcd
and the umbos somewhat prominent. The anterodorsal margin is
somewhat coincx. i)inched up at the edf>e, and sloi)ed {gradually to ilic
eveidy rounded anteiior end; ventral marj;in is broadly and nearly
evenly rounded throujihout, without any sinuosity, and forms a blunt
point at its Junction with tiie postero-dorsal niarj>in, which is nearly
straight or slightly (!onvex for the greater i)art of its length, with the
edge thin ami i)inched up. Tlie umbos aie somewhat prominent and
the beaks curve strongly inward and incline a little backward at the
tip. The ligament is well developed, dark brown, and as seen in a
dorsal view, tills a narrow, lanceolate excavation in the margin just
behind the beaks. In an interior view it is conspi(;uous behind the
beaks and occupies a curve<l not(!li immediately under them, and e\
temls forward for a short distance in a thin, marginal groove. Tiie
resilium is abortive or nearly so; in many cases it appears to be repi'c-
sented by a nunute black speck, adherent to the ligament, and occu-
pying a minute indentation in the edge of the hinge-margin diicctly
bt'iwath the beak, external to the series of teeth. The hinge-margin is
broad and rather strong, beeojuing very narrow below the beak but
without a distinct notch or chondrophore; the posterior jtortion is

I

NM. ii:!n.

DEi:r-nM'i:i; MoLT.rstcA—VEuniLi. txn iir.-<ir.

879

nearly straifijlit, the less oblique juid considerably the longer, and forms
a Dioad angle with the anterior. There are in the larjjest examples
about eleven or twelve teeth in the anterior series*, count inj;- tour or
five very small i)roximal ones; and in the posterior series, fifteen or
sixteen teeth of which the live or six proxinuil ones are niinnte. In
luiuiy sj)eeiniens the two series are not distinctly separjited un<lcr the
beak, in others there is a very minute, edentulous sp;ice in line with
the ujinute ligamental notch. The larjjest teeth in the middle of each
series :irc v<'ry eloufjated, erect, acute, with tlu^ tii)s turned ui)ward
toward the niarjjin. The surface of the shell is covered with \ery
rej^ular, concentric snlcations sei)arated by narrow, evenly roiuuled
ridfies of about the same wi<lth: in most cases this scidpture is
faint or nearly obsolete toward the imstero-dorsal mar<,nn and on the
und)<)s. In many specimens, a number of faint radiatinj; stria- run
from the und)OS to the antero-ventral marjiin, similar lines sometimes
occur posteriorly. The ejjidermis is without nuicli luster, of either
greenish yellow, light yellow, or straw color, more or less iridescent,
especially near the umbos. Along the dorsal nnirgin the outline of
the teeth can be imperfectly seen through the substance of the shell.
The intei'ior in fresh specimens is lustrous bluish white and in some
cases is distinctly tinged with pale tlesh-color. The muscular and pal-
lial impressions ai'c usually imlistinct but some specimens show a small,
but distinct, angular pallial sinus.

The alcoholic specimens when <lissected were found to have a short
8i])hon and a large, stout foot with a broad disk having strongly <-ren-
ulate<l edges. The labial palpi were long, crescent-shaped and the
tentacle-like ai)pendages arising from the outer bases of the exteriial
])alpi were veiy long, slender, and coiled in a, spiral. The gills were
long, narrow, and ])rismatic, one on each side.

Length of one of the largest specimens, (!.5 mm.; height, 1.6 mm.;
thickness, about '.^.~> mm.

Young specimens about 2 mm. long are more equilateral than the
adults and have the posterior end less produced and moie evenly
rounded, the umbos decidedly i)rominent, ami the surface coveied with
line, regular, c<mcentric grooves, the epidernus showing distinct iri-
descence.

Found in large nund)ers, at many stations, between X. lat. 12° 47', W.
long, fil/^ 4'. and X. lat. iJo^ W oO". W. long. 74^ r.7' 40". in 12."..] to 1,7;?1
fathoms, 1883-1887.

This species shows considerable variation in foi'm when a. large series
of specimens from the sauje locality are compared. Some are deci<ledly
more elongated aiul tapered jmsteriorly than the typical form, others
are somewhat wShorter and moie regularly ovate with the jtosterior end
blunter or more rounded; all agree essentially in scidpture and in the
pt 'uliar structure of the hinge and ligament.

This species has some resemblance to J\r. sericca Jelfreys, of which it

■

880

msBstKa

ri!()ri:i:i)ix(!s or rni: s.itiosji. misecu.

viir.. NX.

was loniu'vly tliouf^lit to Itc a variety. It dinVis. liowcvcr, in its larf^er
size, more ovate form, the postei'ior end Ix'iiij;' more ])ro(luce(l and
tajx'H'd, and in its stroiij^cr seul[)ture, .V. corimUntd Dall is narrower,
more eloiij;ated, with more prominent beaks. .V. (lutttlntiuiiihiris {\)i\]\)
is shorter and more triaiiyuhir in form, vath the postero dorsul margin
more obli<iiie.

Suljtaiuily 'I'lXD^VIilN^.V; ^'«■l•l•ill .ukI Hii.-^li.

Ciifiilli'irniii l"is( ••KU, Manuel ("oiu'h., ji. OSl, 1SS7 (in ]iait >.

riii(l<ir'ni<i A'kkkim. and l>rs[i, Aiiior. Joiini. Sci.. III. i)|i. 5S. ti;>, Jaimaiy, issT.

Tlie genus Tindaria dilt'ers so widely from Mdllttia and otlier genera
that it seeme<l neeessary to establish a new subfamily for it.

In this group theshell is rather thick, short-ovate or veneriform, with
the posterior end the longer, and with the beaks turned forward. The
resilium is wanting. The ligament is well <leveh)ped and lu'ominent.
The teeth are numerous, V shapetl, in two series which are fre(iuently
continuous proximally. There is neither pallial sinus nor true si^dious.
The nnintle is broatlly open ventrally, but there is a sejiarate anal or
elferent oriliee surrounded by small sense i»apilhe. The i»alpi are
large, with long, slender appendages. The toot has a large, termiinil,
crennlated disk.

This group agrees with Malletina- in having no resilium, but tiie
latter has well developed siphons and a pallial sinus.

KO. 1 I

TINDAHIA Bellardi, 1875.
Thnhirio \'KI!1;II.I. iiiid IWsn, Aiiicr. .loiirn. Sci., Ill, jip. TiS. (i;;, .I.ainiary, ISHT.

Tjiju: — Thiditria araia lU'llardi.

iSeveral recent writers on these shells have regarded Tindaria as a
subgenus of MaUctia. In reality they form two widely <liverse genera
and have little resemblance excejjt that in l)oth the resilium is want-
ing. In typiital Timlaria the shell is sw^ollen, short ovate or subcor
date, without any rostration, with prominent uml)os and with the
beaks turned forward. In fact the shell may be <lescribed as \eii( ri-
form. The surfa(;e is usually coU(;etitri<!alIy grooved. The series of
teeth are often contimu)us nu'dially. Theie is no pallial sinus.

A specimen of T. aiiKthHi.s Dall' from station I'-'^S."). among I'^oraini-
nifera, in 7.'>() fathoms, not very well preserved in alcohol, has the
mantle closed for a short distance behind the anal oritice which is large
and surrounded by twelve or more, rather large, unecpial papilla', but
does not appear to be cai)able of being ]»rotruded in a tubular form,
unless a very short one. The mantle is otherwise freely oi)en along
the wiiole ventral margin to the oral area, with its edges neaily plain,

^Malhtit( {TiiKlaria) ri/lherva Dall, Itiill. Mus. Coiiii". ZoiH.. XII, i>. l'r>l. 1>^|';
XVIIl, )>. i;W,1889; —Malhtia (diiabUis Hall. i». 138; ^^Tiit(htvin amahilix Dall. pi. \i.,
lig.8.

'"T!

NO. li:!!l.

i)i:i:i:n.iT/:i! Mdi.iAsr.i-vEuuii.i. asd iirsii.

.S81

showing (jiily very iiiiimto papilla' ixjstorioiiy. Tlic l(M>r is larjio and
stroiij;', with abroad, stronji'Iy civnulated and striated, coacave disk,
pointed in front. Tlie j^illsarc well developed and somewhat '"ri(|iietral,
The palpal tentacles are rather larj^e, long, tai)ered, tri<[netral, strongly-
grooved, curved in siekle-sha|)e. The pali)i are rather broad and short.

The following are some of the known species:

7'. ((ratu iJellardi, and 7'. xolida !Seguen/.a, fossil, in the Itali:ji ter-
tiary formation ; r. ci/tlii'reii 1^',\\\ = T. tv'/<('r//bry»/.v (Smith), T.aiiiahHis
Dall, 7'. lurcii.s Dall, T.((ciiiiilH Dall, T. cnncatu (Smith) = T.sniitliii
])all, 7'. I((f<( Verrill and I>nsh, all Florida and West liidian speeiesj
and T. cdUi.stif'oniii.s \'errill and Hush, off Chesapeake May.

TINDARIA CALLISTIFORMIS Verrill and Bush,
il'l.itfs I.XWIII. lin. 1; ],X\X, tins. (). 7.)

Tiudxria lullixliformiH \'kukii.i. mihI lii^ir, Aiiic
:.'(). lit, .hiiiuary, IS!»7.

.(ourn. S<i., Ill, ],. r>!l, ti<;s. 10,

&■

^-y

Shell small, stout, thick, regularly ovate, sculptured with very regu-
uh»r, line, concentric grooves, and having a broad, thick hinge margin
with a continuous line of teeth and no choiulroi)hore. I'mbos swollen,
beaks i)ronnnent, strongly curved inward and somewhat forward, with
tlu' nuclear shell (prodissoconch) smooth and glossy. The lunular
area is somewhat excavated but has no delinite boundary. Anterior
end considerably shorter than the posterior, both e(iually and evenly
rounded. Antero dorsal margin convex, sloping rather rapidly and
forndng a continuous curve with the anterioi' uuiigin which is also
continuous with the more broadly convex ventral margin: the poste-
rior end is evenly rounded, with the dorsal margin strongly convex,
sloping gradually, without any delinite angulation. The surface Is
covered with very regular, line, close, concentric, rounded ridges, sepa-
rated by semicircular furrows about twice their width, except on the
und)os where the two are about «'(iiuil. The inner veutral margin is
plain, sharp, and slightly beveled. The hinge inai gin is widt^ and
thick, narrowest Just behind the beaks, gradually widening and thick-
ening toward both ends. The anterior portion is much the shorter and
somewhat the wider and slopes more rapidly; along" the narrow mid-
dle i)ortion the teeth are (piite small, but regular, transverse, and sep-
arated by narrow^ intervals; owing to the absence of a choiuli-ophore,
there is no delinite center, but in front of the tip of the beaks there
are abcmt eight teeth which increase rapidly in si/e and piominence,
the four distal ones being large, elevated, and somewhat V shajx'd;
behind the beak there are about twe^ ty-three teeth, of which nine or
ten i)roxinuil ones are snuiU; they then coiuuumhu' to increase in size
and length so that eight or nine are larger and higher than the lest;
these are, however, smaller and more acute than the largei- ones in the
anterior portion; two or thre.- distal ones are a little lesseU^vated than

"1

*

I'r

(HV

N. M. V(d. XX-

-5(»

mmmmtm

HX'i

I'uoci.i.uiscs OF Tin: XATKiSM. Mvsr.ryr.

Vnl.. x\.

those Nvliicli ]»i'»'cc(l(' thrill and a little (lilfcrciit in turni. .\bovi' thf
tt't'th theiv is a distiiict and latlitT deep snbniai\yinal jrioove tor the
lijiamciit whicli extends eontiniiously both in front of, and behind the
beaks, r.eliind tlie beaks there is a distinct rounded ridj^e running
outside of, and jiaraUel with the li,uamental j;roove and torniinatinu' iit
the distal end of the row of teetli. rallial biie entire: no siplion : aii;il
o])eniii}^ separale'd. surrounih'd by about twelve unequal i)ai(ill;e: else
where the o])eii mantle edu'e is nearly plain: foot lai'ji'e with a creiiate
disk.

Epidermis pale yellowish browu: interior ylossy bluish white without
pearly luster.

fiength. <S mill.: heij;ht, 0 mm.: thi(dvuess, about 1.5 nun.

A small s]>ecimen (i mm. lon<4, I'.o mm. high) from station 271 I. is
doubtfully icferred to this species. Externally it is covered witli \fiy
line reynlar. concentric, ra.ised lines and grooves, agreeing W(dl with
the eorresi)oiidiiig uuibonal itortioii of the type. The epidermis is thin.
l)ale straw color. The outline is also similar but the posterior half dt
the shell is relatively a little bidader. owing to a slight expansion di
the postero-ventral margin. The beaks api)ear to be relatively less
l)ron!inent. The external ligament is well de\elo]»ed both sides of the
beaks, aud is slightly thickened Just under them, and tills a very slight
notch in the edge of the hinge margin above the teeth. The hinge
l)late is relatively broad and strong, esi)ecially anteriorly. There arc
thirteen ])osterior and nine anterior teeth, the two series separated hy
a small edentulous sj»a(;e. Some of the distal teeth in the anterioi
series are unusiutUy large and stout and exceed any of those in the
])osterior series. The pallial line i« distinct and entire.

One live specimen (station i'."»i)<)), N. hit. 37"^ L'3', W. long. 03 s . in
2,(!l'() lathoius. 188."». One, \ery young, live specimen (station L'71 1 . N.
lat. 3S' L'L", \\. long. 7(r 17' 30", in l.Si!.-) fathoms, ISSC.

This speeies is remarkable for its thick, linn shell, regular ('\ate
form, and very even, concentric sculpture. In form and general
appearance it resembles some si»ecies of Callusto.

I

I

W

TINDARIA LATA, new species.

Shell rather thick, somewhat comi)ressed, broad-ovate, equilateral,
narrowest in front of the beaks, the posterior end somewhat jirodiued
and very broad. I'mbos only slightly prominent. Ueaks smaU, rather
acute, turned directly forward and closely api)ressed to the margin.
Noluuule nor escutcheon. The antero dorsal nuugin is nearly straight
and slo[)es but little, but becomes a little convex and ]»asses insensilily
into the evenly rounded curvature of the anterior end; the ventral
margin is very evenly and broadly rounded but the curve recedes as it
]»asses backward so that the highest }»art of the shell is distinctly
bcdiiiid the middle: the ])osterior end is very evenly and broadly
rounded without any angulation; the posterodorsal margin is (Miisid-

%m

tiu. n:;!).

i>/:i-:i'-u\i 11 u Moi.i.isc

\i:iu;ii.i. .1X1) III >//.

8S3

erably l(»ii;:;t'r tlian the iinterior and slopes i»r»'tty ii'iiularly ami i^radu-
ally iVoMi the beaks to the posterioi- exticinity. The sm lace is covered
with very lej^ular. ratliiM' coarse, rounded, coneentric ridycs scparati'd
by deep I'lirrows of aboat the same brea<ltli. The epidermis is lii;ht
straw color, only slijiihtly Instrous and scarcely iridescent. The hiiij^e-
l»l'it(; is large and stronj:'. much elonj-ated ]>osteri()rly. the t\vo]»;irts
lui rinn,ii' a very ol)tuse. curved angle at the beaks. The anterior jiortion
is the broader, much the shorter, and bears about nine teeth, of which
the three distal ones are nuu-li the larjjer and occupy about one halt
the len.u'tli of the series, the pi'oxinuil ones beiny- very small. The [m)S-
terior i)oition is luirrower and curved throuiihont : it bears seventeen
or eiyhteeu teeth of which seveu or eijiht i)ro\imal ones are very snudl
and acute. The hinge-plate becomes (juite narrow under the beaks
where the two series of teeth are interrupted by a \ery small edentu-
lous s])aee, scarcely wider than the adjacent teeth. All the l;n\uer teeth
are rather crowded and compressed in the direction at right angles to
the line of the hinge so that they are only slightly V-shaped. Seen in
a dorsal view they ai)pear thin and not very i)ronniient above tlu; mai-
gin of the shell, when the tips are broken thi'y otten appear three-
lobed. The ligament is well de\eloi»ed and occupies a distinct, sub-
nuirgiiiid furrow behind the beaks. The muscular scars are well
nuirked, small and nearly round; the pallial line is interrupted at a
point a short distance from the posterior muscular scar but there is no
visible sinus. The interior of the shell is grayish white but not pearly;
the ventral edge is slightly beveled.

Lengtli of the largest speciuu-n, 7 iiDu.; height. ■")..") mm.

Two specinu'iis, among h^orannnifera. at station L*3s.j. >'. Int. L'S" 51',
W. long. 88- 18', in 7:50 fathoms, 188'>.

TINDARIA CUNEATA (Smith i Ball.

MaUi'tiK ciDHdlii SMiru. K. A.. Ixi'itort \'oy. Chnlleninr, ZoiU. I.aiiiel!il)r;iiu;liiata,

XIII. p. IMT, 1>1. \\, ti^-.s. 10. Kif/. 1XS5 (luit ,JelVr.'y>K
Mallctia (Tifuhd-iii) smithii K.vi.i.. Hull, Muh, ('oiii]i. Zmil., XII, ]>. 255, ISsti.

A single young \alve, among I'oraminifeia, at station 2Vhh), N. lat.
'>7' '»i*', W. long. .8' 7' 30". in 338 fathoms, 188<J. Off Grenada and

0 West Indies, in 31»(> to 1,140 fathoms.— Smith and Dall.

As the species described and ligured by JNlr. Smith under the nanu^
oi Mullet iu ciDwata is a true Tindmia, his name does not contlict with
the MnJUila vunenid of .lelfreys which is a true MdUetia, and therefore
should remain untdianged.

Subgenus TINDARIOPSIS Veirill and Bush, 1897.

Tiiiduriopnii N'l.iiiui.i. ami Hrsu, AiiitT. .Idiirii. Sii.. 111. jip. 51i, (Hi, .laiiiiai y. 1S97.

Ti/iH'. — Tindariojtsis (itjathUlx (Dall ).'

^ MiiUiCut {Thiilaria) aijiilliida liall, I'nx;. I'. S. Nat. Miis.. XII. p. 'S>'2, i>\. Mil, lig.
10, i)<S[K

^^fTfim

Ss4

ri!<>ci:i:i)iSiis or rut: xatiosal mi s/:i m.

vol.. XX.

This (li\ isioii wiis proposed for those species w hieh liave u short ros
tiiim, (leliiied by ii riidial rid^e and a furrow. The t \ i)e has a well-
marked d(»rsal lijianieiital furrow and a small notch or "socket" undei-
tile beak for the specialized part of the ligament, it is uncertain
whether it has a siphon and a pallial sinns. In ease these are present,
it should form a distinct yenus and be placed under Mallet iine.

ANALYTUAI. TAIil.Kul' i;i:( KM >C ItlAMI M 1>. (iKNKIJA. AM) Slllli KNKliA ill I.KJilh.l,

AM> \f( 11.11) i; lIKlIi: ADoriKD.

A. Sliell not ii;ii)iii;;. sli()rt-()\ iitt', siibtiiuoiiiil, or roiiiHlrd; jjostcrior end without .1
I'ostriiiii; l)u;iUs usii.illy ciirvcil luickw anl ; no siiilion tubes nor juillial sinus.

Xiiciilidd' (I'Orbiuuy.
15. Shell more or les.s trigonal, usually oblique ; jxi.stciior end usually shoiici ;

beaks tinned backward XiKiiIhur Veriill and liu>ii.

('. Teeth niiinerons. transverse. V'-sli.iped, I'orininy two eonvexly arched or aiigu-
lated series; a distinct luedi.iu i hoiididiihore; no lateral teeth.

\iiriili( Lamarcli.
cf. Teeth tew, not loniiiny,- lonji series; a loiin; lateral tooth in eaih vahe; ih>

median ehondrophore .ynciilina d'Orliiuux

AA. Shell ovate, oblong or lanceolate; ])csterior end iiciierally the loiiucr and
usually more or less rostrated; siphon tiil)es and pallial sinns geiier.illy pretseiit.

I.idid'i 11. anil A. Ad.inis.
(', Cartilaue or lesiluini ])i'esent, not closely united with the cNti'mal ligament.

l.iiHiiii II, ,iinl A. Adanw.
((. h'esilium supi)orted by a detinite concave ehoiidropliore extending inwani lu.

or beNonil, the inmr edge of the hinge-plate.
/'. .*^hcll not gaping unless at the end of the lostruin.
c. Shell distinctly rostrated and earinated posieriorly.

I.tda Schumacher (sense extendeili.

(/. Shell elongated and tajiered i)osteriorly, rostrum long, bicarinate, blunt ; li;;.i-

niental area or escutcheon long and well-delined ; iiallial sinus and ■'iphnu

tubes di'Vclo]icd I.i da i sense lestriited 1.

lid. Shell shorter, swollen, i)\a!i? or oblong, posteriorly not much elongated; ros-
trum short, usually acute, unicarinale.
('. Shell o\ate, rostrum sniiill, acute; ligamental are.a or eseutcdicon distinctly

bordered by a carina,
/'. K'ostrum short, subacute, siibniedinii, delincd below by a ventral sinuositv or

emargination Jiiiioni<i Segiienza^:; Ledditt Verrill and Hush.

If. Iv'ostruni short, dorsal, not detined Ixdow by a ventral sinuosity: ]iostei(i-

dorsal margin concave; escutcheon •sunken Iiiiiitcria liclhirdi.

ii\ Shell ol)loiig. angular, sulitriine.ite, rostrum short, angular, dorsal, defined

below liy a marginal sinuosity; escntcheim well-delined I'orthtiidia .Milrcli.

vcf. Shell not rostrated, small, ovate or ellijilical, rounded at both ends, anterior
end the shorter, no carina, luniile, nor escutcheon ; caitilago posterior, iiitii-

nymjihal Mhrojioldin \'errill and liiisli.

hh. Shell oblong or lanceolate, compressed, nearly plain, more or less g.ii)iiig .it
both ends; rostrum not Nvell-delined; jtallial sinus large and broad; tubes lonu.
united.
'/. Teeth transverse, -sh.-iped, immerous, in two long series; chondropliorc larue.
concave, iirojecting strongly inside th(! hinge-plate.

Yoldiii Moller (sense e\teiidein.
h. Shell large, eompri'ssed, rounded an', viorly, broadest posteriorly with a ]ios|cio-
ventr;il inotrusion .'ind radial ridgo; rostrum short, broad, poorly dcliiicil;
external ligament well developed, jirominenfc both sides of the beaks, oci 11
jiying a continuous furrow; no liiuiilo nor eseiit<'heon.

Mcijayoldia Verrill and Hn-lt.

i

*

it

NO. 11:

p

f

No.li:i9. 1)I:EP-W.\TI:I! Mol.I.l S(A—\KI!i;il.L AMI l:i s/l. S85

]ih. Slicll liiiiifolato or loiin-oviitt', postoriorly hjhiowimI aiitl .-umiw liat floii-
gatt'd, nior(> or loss simioiis Itclow ; rostrnin Hli<ilitl y (lelini'tl, smooth or Mli;;litly
carinatc ; cxtiTiial lij;anuMit iVrl)ly <li'velo|i(>il )'ol(liii i vrnsc risti icii-il i,

/(///(. Shell oliloiiy;, smooth. ]ilaiii, liliiiil ami roiimlt'd at both I'lnls. without iiiiy
(liHtiiW carina, siiiiiosily or rostrum (tvthoinihWn \'( rrill and liiish.

hhhh. Sh. 11 thin, comiiri'sscd, narrow-ljinci'olali- ur l<ini,'-rili|itl(al. m.irl.v ic|Mi-
latoral, jind jiajjinii at lioth ends: sculjitiire oldiipic.

Adiami 1 1. and A. .\daui>.

hhhlili. Slitdl hyalino. oblonij-ovatc, hroad ]inst(Minrly, ((iiircntrically si nl|»-
tiirrd, rostrum nearly oli^olctc I (IvnuiUn \ CrriJl and Hash.

fltj. Shell thin, ohloiii;-. im-iinilatcral. lilnnt at liotli nids. not ro>tratcd nnr <'aii-
natcil: teeth lew, lamellai. ver> oldic|iie. Type, >'. /'»((7/7/.v .letVreys.

Sillriihl .letVrcys.

<((/. Siiell small, iiearlx' )dain, not mncli nitrated nor rarinaied: re^ilinni with-
out a ]ir(iminiiit ehoinlrophore, sitiiiited in a nuti h in the liinue-maijiin. inter-
I ii])tin,u' the sciies ol'teeth.
/. Teeth V-sli;i]»ed, numerons in liotli seiies.
tn. Sjiell oldonji or snhox ate. Idnnt ]>ostcriorly. with a slinhtly siniions ninrjjiti,

son uptimes snhrostrate. not carina te YnJiJiillii \'errill ami i'.nsh.

mm. Shell ri^unlarly ovate, rounded at both ends, not siinmus iinr eat inate, i .'i

no jiallial sinus SarepUi A. .\dams.

11. Shell short-ovate, not sinuous nor aniiulatcd; teeth few. oblii|ue, not ret;n-

larly V-sliaped. Typt", /'. oraliix Se;;-uen/.a I'lumeohts Se'^iien/a.

CC. No true resilium; liuameiit well develo]ied, often promimMit liehiml the beaks

which are usually turned I'orward.
1). .^iphon tubes and jiallial sinus jnesent; teeth mostly V-shapeil. in two lonj^
series, often interrupted by a median edv^utuloiis space.

Mdllclhiii If. ;iml A. Adams.
«. Si]>lion tubes Iouk; pallial sinus larjic : shell elonj;ated, jj;a]iinii'.
}). Shell oblon;;' or elliptical, blunt jiosteriorly, not distinctly rostrate: seiie> of

teeth unequal; those in the anterior series fewer Malletia 1 >esinoulins.

j>p. Shell loufi-ovate or obhniji, broadly aiiu;ulated and sinuous posteriorly : dis-
tinctly rostrate and I'arinate; two series of teeth m^arly e(|ual.

Xc'ilii II. and A. Adams.
()(). Siphon nnd pallial sinus snnill, shell ovate, not ;.japin<;; a rudimentary mar-

liiiial resilinm \<ih>iiillii Kali.

1)1). Shell short-ovato or subiordate. closed at both ends, umbos i>romiiicnt; li.ua-
mcnt entirely external; series ot' teeth jjenerally continuoiis.

Thidariitti \errill and I'ush.
«. Shell refi'ularly ovate, orooved, without rostrum or carina: licaks turned

forward ; no jiallial sinus Timiiirin liellardi.

as. Shell ovute, with a distinct jiosterior sinuosity and .a short rostrum.

TiiuUirioiixm X'erriil ami Hii>h.

Fiunily SOLENOM Y ID.K.

SOLEMYA GRAMDIS, new species.
I Plat. I.XXXVI. lij-s. 1, •_'. 1

Siiell large, <M>n.si(l(M}il)ly bi-oa<ler aiitorioily tliau i)()sti'ri()rly. dorsal
margin in front of tlie beaks straight and thii-koned by an internal
ridge and a strong epiilermal fold. At tlie anterior end tlie valves gape
widely, and tlie edge of eacli is divided into six or seven long, nearly
regular, digitate processes of nearly nniforni widtli. and obtu^ely
rounded at the ends, se[)arated by notches, rounded proxinially. The

:|^

m^

rj:i>c/:i:ni.\iis or riii: \. trios. if. mis/.im.

VOL. XX.

general outline of this end is broiidly trnnrute; tlie ventral niaryin is
soniewliat convex l)Mt slopes njjward toward tlie jtosterior end and is
nearly straii;lit aloiij;' the middle: Mie jxjsterior end is short, evenly
rounded, with the dorsal mat j;in, behind the l)eaks, strongly incurved;
the large black ligament which occupies this area is continuous with the
epidernds, so that its outline forms a curve nearly in line with tiiat of
the anterior end, and shows but a slight angle, or lobe, at the outer end
of tiie dorsal line. Tiie umbos are thittened, and scarcely prominent.
The whole surface is covered with a thick, smooth, glossy epidermis,
chestnut-brown in th(^ yuing and brownish black in adult, which ante
riorly is divided into several rather broad digitations that are shorter
aiul somewhat wider \enti'any, their length diminishing from the nn'd
die of the anterior end to the \entral margin, along the nnddh; of which
there arc no digitations, but short and broad ones again apjiear pos
teriorly. The siiell is sculptured by radiating ribs and furrows which
are but slightly developed on the middle region but become large and
.strong anteriorly and smaller an<l closer ]»osterioily. On the anterioi-
l)art these ribs are broad and flat, separated by wide, tlat-bottonied,
furrows often nearly as wide as the libs; on the middle area, the Inr
rows are shallow and rounded while the intervening spaces are Ihit,
sometimes broad, at others narrow, this region ai»pearing comparatively
smooth, some specimens showing but slight indications of grooves a ml
ribs; ])Osteriorly these are somewhat nn)re numerous, narrower, ott»ii
about equal in wi 1th. In specimens of medium size, there are from six
to eight of the large anterior furrows and as many ribs; the edges of
tlie latter are somewhat elevated above the middle portion and tlMso
thickened margins extend out along the edges of the digitations which
otherwise (or.espond to the furiows. Internally the shell is white.
moderately thick, the anterior jxntion oblong with obtusely truncated
end, the dorsal and ventral nmrgins nearly parallel, and the posterior
uuich narrower and tapered to an obtusely rounded end, with tiie
dorsal margin excavated for the ligainental area. The surface shows
distinct but not very pronunent grooves ami ridges corresjjondiiig to
the exterior ones; at the anteiior end the margin shows slight lolies.
corresponding to the intervals between the epidermal digitations. The
anterior muscular scar is large and rounded, the posterior one is
smaller and subovate. Anteriorly the hinge-margin is thickened in
both valves, running from near the beak nearly to the end; posteriorly
it is more strongly thickened by a sinuous callus to which the lig i
nient is attached, while under and Just in front of the beak the maruin
is excavated for the reception of the cartilage which continues foi w;iid
in a groove and is continuous with the broad, dorsal, e[>idermal mar-
gin which unites the two valves throughout their length. The posterior
ligament and anterior cartilage ai)i)ear to blend Just beneath the t)eaks;
the commencement of the cartilage is, however, indicated by a slight
notch in the callus-nuirgiu, in both valves, and the ligament ai)iteais

mmmm

mmmmmmm

NO. 1130.

DEKP-\\ATi:i: MOLLrsr.i-vr.uuii.i. wit l.Csii,

mi

to extend forward in a point between tlie two sides oi' tlic ciirtilaiic.
There are no transver.'^e co.sta- or l)uttres.se.s for streiijitlieniriy tiie Iiinrre-
niaryin.

Ijitirelengtli.inclndinj,' epidermal lubes, ,')l miii.; eiitiie li("i.o|it,„p,„).
.site the beak.s, 22 nmi.: hei-iit of the anterior tliini, 2(; mm.: breadth,
in the middle, 12 mm.; length of longest (limitations, about lOor 12 mm.;
length of the shell itself, 12 mm.: height at the mid.lh", 1.-. mm.; length
from beak to anterior end. .SO mm.; to posterior end, II mm. I'nin-
meats of specimens more than twice as lar<;-e as the one mcasnred havt;
been taken. In one of these the height of the shell withont the epider-
mis is 2."» mm.

Two ^'ood .specimens and .some fragments, at fonr stations, between
N. hit. ;U>" o8' ;K)", \V. long-. Hr^ 30', and X. hit. '61'^ 24', W. long. 7117'
in 3(»() to l.GOO fathoms, 1880-1884.

I

KXrLAXAI'loX OF IT-ATHS.

Thr (i,i;iirfs on rhiic \\\ li^;. 1', I'l.it. \ 1. (i->. I,!', I'l;ilf \ II. 11-. !i, I'lnto XXIJips.
1. •-'. uimI I'hilc .\.\\ . li-. S, wciv (Ir.nvii l.y .Mr. .1. II. Uliikc. I'latt' .\ \ . <i-s. !». III. H.
well' (Irnwii Ipy Mr. .1. II. Iliiicrtuii. 'I'lic nther (i;,niri'8 me iill ciiiiu'ru-liniila (lr;i\v
iii;;s by Mr. A. II. V.iiilj.

I'lATi; I.XXJ.

Y^\<i. 1. ('afdiiiiinjn (jhtpld Itn.sli. y. f<l!). Dmsiil \\v\\ di' tyjx' >])c<inii'ii Xu. ;;,"»:;( li';
X Id (liiiiiii'l.r^.

•2. <'iiKi>i<l<iri<( (iiriirii (M.Sais) l>all. )>. XDW. Iiitcriur of ii left v.ilvo riuiii .sta-
tion 70; X iiliont Ii. lirdkcn oiitliiic rcstoiiil liy lino of ^xiowtli.

3. ('(irdioiiii/ti f/iiniiiit X'cnill ,'inil ISusli, j). SO!). Doisiil \ icw of sjK'cinii'n Xo.
•II I.'.i;; X If.

I. 'I'lic s inif. Intcriui- of ]r|| xalvi; of llic fanir .specimen : X alioni 13.

.'). rnspidiiriii media N'oiiill and I'.asli. jj.SOI). Iidisal \ic\v of sjn'cinicn XH
■lilliL'O; X •"..

• 1. 'I'lic sanio. Inti rior of lolt v.ilvc of lype sju'ciincn Xo.l!l018; X ."i.

7. ('iis}>id(iri<i J'rntcnin Xi'VvUl and I'.nsli, [(.MILS. Dor.sal view of sijccinion Nd.
1. ■-!!•( 12; X .').

s. TIio s.iinc. Interior of left valve of typo .speeiineii IVoin station 8!»2; x '».

0. Ciinjiidiirid (jhiriiiliH ((i. (). Sjiis) Dall. ]>.S()0. Doisal view ot' specinicn .Vo.
4902:5 ; x .'..

Pi.,\Ti: LXXII.

I'ijjj. 1. (iisj)ld(U-ia iniddtn \errill, ]>. 7ilN. Hinge of liotli valves of .specimen Xi>.

r)2.")l7; X aliont ;{.
2. I/<iI()niii)ipli(( slri((lell(( ^'errill and linsli, i).810. Ilin^i' of a riylit valve f:oin

station 2(>.'')."); x 25.
;>. The same. Tinned np to show anterior tootli ; X 2.">.
t. Mjinnn-ti )(/y(Hf),s(( (JellVeys) \'errill and Hnsh, ]). l-ill. Hinge of rijjlil vahr

of si)ecimen Xo. .■')2.")l I ; x iibont 1(1.
.">. Cii>^pid/(ii(i nntricosd Verrill and Hnsli, p. 802. Ilinnc of a rigiit valve Xo.

ri2.->l8; X 5.

6. Ciispidarid roxtrahi (Speni,der) Dall, p. 800. Hinge of both valves of speci-

men Xo. 100()7; X 5.

7. Cuxpidaria iniriidfi Verrill and Hnsh, p. 7911. Hinge of both valves of type

specimen No. 78789; X abont (i.

I'LATi; LXXIII,

Fig. 1. Cuspidaria siihlorUi (Sars), ]>. 80(i. Hinge of both valves of si>eeinien
52,-) 15: X 9.

Xo.
52,-) 15; X 9. '

2. Cardiomyii jxrroslniid Dall. p. 81)9. Hinge of both valves of sjiecimen Xo.

48933; X 22.

3. Cardiomi/a unillicostatK \'errill and Smith, ]>. 808. Hinge of l)oth valve> of

specimen Xo. 48917; X I.J.

4. Cardionnja (iln/tinicuht Verrill aud Itnsh. ]i.80t). Hinge of two separate \;il\es

Xo. 7889(5; X 4i.

5. Cuapidftria glacialis ((i.O. Sar.s) Dall. ]>. S()0, Hinge of right vahe of sjjeci-

men Xo. 49011 ; X 4 A.

6. Ciixpidarhx midia A'errill and Hush, ]i. 80 1. Hinge of both v.ilves of type

.specimen Xo. 49018; X 9.
888

6.

NO. ii;;o.

DEKI'-UA ll.l! MOI I I S(A-\i:i;i!ll.l. ASH HI sll.

8X9

T'rvii: I.XXIV.

Fi;r. 1. ('ivili'inniii iihiiHKii-nhi \'«MTill iiml I?ii>li. ]i. mmI. I'.xtfiini' nt' liulii vijIvi- hI' a
yniitin' s])eiini('ii Nil, 7>*!K>ri: x 'K
'J. Miiinii III riiiihiom t,hA\'rvyH) \i-r\\\\ :\\ii\ l'.u>li. ji. M 1. lAtn lur ui' i i-lii viiUc

of s|M'(iiiicii N(i. r>'_'.'il I ; X iiliiiiit s.
;<. Viirdioiiiiiii jii riofilriita l);ill. |). Mi!', liilfiinr uliiulil \:il\r nT M|iiTiiiii'ii Nu.

7Hi»H:$; X !t.
■I. ('iiKiiidiniii, mihtorlii (Siiisi, ]t. ,S(MI. llin<;c ni' 1. H wilvr ,<{' vjk riiinii Nil.

."il.'."> I ."» ; X M. 'I'liriic'il ii|i 1(1 slinw ]i(i,stfrinr timili.
"i. Tlio Niiiiic. Iiilrriur (if t lir siiiiif \ al\ c; X I .
ti. ('iispiihiiiil I'liriiiOKil Nfrrill and l!tl>li. ji.SOH. Iliii;;p iil' Imtli \;i1\in dl' t \ pr

sjicciiin'ii No. "NJUI!; X I'. 11"' i'i;;lit \alvf i-. liaillv liroKrh.
7, diKiiiihiriii iirvlica (M.Siir.s) I'a'l. |i.sn;;. Iiiiim> nl' a Idt \al\i' liuni -taiiim
7(i; X 11.
Miimiiia limiiliilii !)all.]>.Xll'. Oms.il view ot' s]irciiiicii Nn.!!>!|7l; :< !•.
('ic^piiliiiiii jiiirva ^'(■^rill and I'lnsli, ji. Mil. llin^c dl' lioth \alvis df iNpi-

.spt'cinuMi from station L'L'dli; X lid.

Citspidovid Jdmilliinii iM.Sars) liall. p. 7!l!'. llini^i- of liutli \al\i'.s of s|ii(i-

incn No. ."ilL'!l2; X "•'•. Ix'fsilinni and ossidf aic atlailicd in llic iii;lit

\ al\ ('.

('iinliiiiintii iirmiiiii \'t>riill and HmnIi, ]i. SO'.t. Ilinjic (if Imili \al\c> (if tv])!'

siiccinicn No. 1 1 iritj; X --. h'l'siJinni and os.sicle at t.icln'd in tlu' left \ al\ c

8,
!».

1(1.

11.

I'l.ATK I.XW.

Fij;;. 1. f/imnjinin «u'««/« (l'liili])])i ), ]i. Mti. Ilinut' ot' riitlil salve cf s|ic(inwn Nd.

7t;;Jl'0; X 0.
'J. I.iiiii>})nin iitVni'iH \'ciiili. ii.Slii. Ilinjfc (it' linlil Nahc of N|ic(inicn .\(i. Hnl'!I;

X !».
o. l/uitopsiH (iiirild ( iiiucilii ). ]i. ^Jti. I linjjc ot' a liulil xalvc from slat inn ;.';>H.");

X aliont 11.
•1. l.iiiiDji.sia iirii/iiiidirolii VtwriU and lin.sli, p. MI7. llin!.;c ol' iii;lii \.il\c of a

yonn;; spt'cinuMi No ."iL'llO; X '•'.
Ti. I. imi>pnin jihnin yerTill, Y>.><\i\. lliiiuc ol' rinht \ alvc of Hpcciincn No. H.-iUliX;

X !••
ti. CiiMpidiiriii /ntlmia N'eniil and ISnsli. ji. .s();i. Uin<;i! df Ikii ii \ alx »■> df l ypo
specimen from station X[y2; X !••

7. Ciispldaiia ohcHU (Lovi'n) Smith, ]i. Sni. lliiiKi' of riylit \alvc df specjiiifn

No. IS!t()7; X !t.

8. Cimpidaria pcUiicida (Stimpson) Verrill and l!n-h. p. mi.".. IIuilic of I'ntli

valves of Hpecimen No. ■tHit77 from (irand Manan ; x -'J.
0. Ciispiddria (iliicitilis ((J. O. Sars) l»all. ji. MH). Hinye of ri:;lit valve of a
fully grown .siioeiun'ii No. I9()3J to show tniueaieil end of tooth; X It.

I'lAir, LXWl.

Fig. 1. J'oroiiiyii sithlvrifi \'(!rrill. variety iniirodoiila l>ali. ]i. Si;;. Ijid view ol' rii;iit
valve of specimen No. 52533; X 3.

2. The sanu'. Interior of the same; x 3.

3. Cardionnin (jhipln ]5nsh, p. SKI. llin'^e of riuht \ .aixc <il' an .idnlt >pi(imen

from stati(m --'UW; x 22.

4. Mijoiiira fjVi(niii'u\\'V\\\\. ]>. 811. Hinge of riglit xaixcdf I \ pe s)ii(inieii No.

352.-)."); X U.

5. The same. Exterior of the same: x lA.

6. Cuapidaria rcM/ric^sa ^'e^ri^ and I'nish. p. Sd'i. Intiiidr of a Icit \al\e No.

78783 ; x 3.

I'i... 7,

i'i!()( i:i:iii\as nr the satiosm. musi:im.

VuL. XX.

Ciirdiiimjid ijhjlitil Pilsli, p. HIO. IIillt;i' iil' ))ntll v;ilvcH lit' :l VOllDi; Np.-ciliic|l

N... :r.:;(;j; x I'l*.

>*. (iiHiiithitid iiiUiirida iStiiiipsoiii Vfirill iiml I'>u>li. y. Nd.'i. Iiilrrini of It-ii

v,il\ r of Hpfciiiii'M \(). ix'.i?"; X !-■
•1. /,'((//( (/<()•<'(( ((/'//-""'riMii X'crri! I and Itiisli, p. M;>. liilerinr nl lil'i \ iihc (ii'.>4piii-

iiKM No. 7x7!t:5; x •!.

I'lvir. LX.WII.

I'iy, 1. Munimii iulhtlit liiiwsoii. |i. 77X. Hiiini' (if ImiIIi viilvrs <it' siifiiiiieii No.

."iL'lL'H; X "i*.
•_', VoliJidhi /(«i(/(i 1 Lov.n) V. Trill iiml ISnsli, p. Mil. lliii^r (if riylif \ ahr di

spcciiiicii No. 7:il7:{; X iilioiit 1I5.
;i. )'<ililivllti xiilKiiiiiiiltild Vcnill and liiish. p. Mm. Iliiinr ni' left \alvi(ir tvp.-

sprriiueii frmn station Itl llacln ; x almnt i;i.
I. riini)i(li)-iit tiirfiida N'crrill ami I'liish. p. 7!t!'. Inlfiior ol' Idt valve ni lypc

spi'ciiiu'ii No. 7!^7H!I; x 1.
."i. Miioiieni [?) prrtitiHii Vi-rrill and I'.iisli. ji. STJ. I'.xiiTior nt' a Ict't vahc I'idni

istuition 2(i.'i5; X 1<».
»;. lUithijui-ca jiiiliiiirithiidvn (ScMcclih Koliclt, varirtx ^iiitrnliiinnilis Sais. p. s l.'i.

lllniri' of 1, It valvf ol'spiciinc'ii No. 711 Hi; X 1".

7. ri(«/(;(/",(riV( j)((r (I \'cnill and r.usii, j). SOI. Intcrioi- of iii;lit valve of tyiic

speeinieu from station JliO)?; X aliont '_'(?.
S. /,'((//((/((;■(•(/ flH()m((?« Yen ill and ISnsh. p. M I. Ilini;e of riulit valve oitvjie

.speiinuMi No. 7I0S1 ; X li>.
i». CdrdioDijiit iil'iinxirola Verrill and Husli. ji. siKi. Kxterior of let! valve of

speeiiiion Xo. r)2lUM!; X <>L
1(». Ifiiliiiiiiiiiiilia shinttUd X'errill and Hnsli, p. SIO. Kxterior of .i lij^ht valve

from station I'ti.")."); X K'.

I'LATI. L\X\ III.

Fi^'. 1. Tindaria call i si if or in is Veirill and I'luwli, ]». f^Sl. Exterior of rii;lit valve ot
typo upeeinieii No. ."cTiUl!; X •>.
:'. lidthndrcd iirn/iiiidicoln C Verrill). [>. Sit. Interior of ri<;ht vahe ol' speeiuirn
No. oL'ni; X (i.

8. Ciisjiiddrid itiid ild Verrill. p. 70S. Kxterior of li^lit valve of specimen No.

52.5 17 ; X 2.

1. The sann\ Horsal view of the same specimen.

,"i. MicroyoUlid rnjiilaris (N'errill), p. 8ti0. Kxterior <if left valve of type speci-
men No. :^S120; X 20.

ti. The same. Interior of ri;;bt valve of the same specimen.

7. l.iiiiopnin niinnia (' i'hilipi>i ), p. Sll). Interior of ri.nht valve of Hiieciinen No.
7i):!l'0; X i.

S. YoldiiUa disKimilin y^iVi■U\ and i'.nsh, p. S72. Kxterior of left valve of t,\pe
specimen No, :>s416; X 1.".

1'I.ATK l.XXIX.

Fi-;. 1. I'eriplomd lUKlnlald Verrill, p. S2 '.. Ilingi; <if l.'ft valve of type specimen
No. 44840; X 7i.

2. VoldiiUa mi)iii8cnla Verrill and ISnsli. p. S70. Kxterior <if ri-ht valve ot

specimen No. ;->s41.r>; X 12.
H. Yoldiclla iHCon82)icHa Verrill and Uusli, p. stW. Kxterior of right valve of a

specimen from station 047; X 0.
4. YohUdhi jYujidd (Torell), p. 872. Interi.ir of left valve of a sp.'cimen from

station 043; X IH.

NO. 1130.

i>i'i:v-n\ri:i! \iiu.rrsr.i—ri;iti,-!r.r. ixh nrsn.

Sf»l

10.

Yoliliillii innniMiticiiH ViTiill ami IIiihIi, i>. mUI. IiiifiiMi- ,11 lift \,il\c da

spcciiiicn from stiitimi !M7; X 1.'.
)uliHillii >it(l),ni'iiiliitii \'i'nill iiiifl Iliisli. ji. ,Ml."(. I'.Mciinf lit' liylii miIm- ot'

tyjic Mpcciiiifii from Htatiou lii lliuln ; x "i.
YoliliiUii miinisciilii N'i'rrill .mil I'lisli, ji. s7o. Iiiti'iinr nf Id't \iilvi> nl" M|ifi'i-

moil No. ;>M1.'>; x '22.

I.rilil hilHhiilllil \'r\ii\\ ,i!iil .<liiitll. |i. H.'il. i'.Xti'liiir ol' li-lil \,il\i' nT l\|ii'

>]iiTimrii No. S,")"!!'.! ; >; ii'miit l>.
('iiHjthUn'm liiriiiO!<ii \'criill ami IiMmIi, |>. Si'li. Iiiii"ior of hit \al\i' ol' t\iif

spii iiiit'ii No. 7s;]ll{; X H.
Mmli s'\i Uii I'ltiijiVis N'firill ami nM>li. p. 777. Kxtfrinr n|' iii;Iit \al\i- nT a

spcciimii t'ldin iH'.ir station l,',jtlt>; x ••.

I'l.Air I.N^ \.

rii;. 1. YoUl'oUii irin \'crrill ami KiihIi, varit'iy siriitu N'cnill .iml liiisji, p. ,st;|. l',\-

ti rior of 1 i'.;lit \al\(' ol' t> jic spi riiiiiMi No. 7IH-r>; X aliout 11!.
2. VohlifUii I'cif \'t'irill ami iliimli, p.st;;!. InliTior of ii jrfi valvr I'lmii statjuii

WC; X 11.
rt. Volilhllii Iik'hIk iI,o\i'ii> \'rriill ami liush, p. stll. I",\ti'iior nf Iri't vaKi' ot'

spcr'. en No. 7ltl7l!; X alioiii tlA.
I, .lilniih III luslii \'('i rill ami jliisli, ]». S^>X. Iiitfiinr u|' ,1 Irii val\ t- ironi siiMion

L'l.'.O; X 11.
.">. YoUliiUit /iiiliriiii \rnill and Hush. |i.St)7. Mxtfiior ul' lett: valvf of typi>

sjierimcn from station !II7; X alioiit \',\.
t). 7V/((?((ri(( (7///i.s/;/'((r))M'.'< Vrrrill ami linsh, p.ssl. Ilin;;!' ot.' rijilii \ ahf of t ypr

.Hpt'cimcii No. ."C.'iliti; X X.

7. Tlio .saint', 'rniiic.l up to show sliapc of tcitli.

8. Yiihliilhi iiitliila Vt'Mill ami liiisli, it.siU. Mxtcrior of hl't valvo of typo

spccimi'u No. SN117; x aliont.'>A.
!t. YohUiUa leiitiriiht (MoUei) variety (n/i/i/io N'eirill ami ISiish. p. SCi!. I'.xiciior
of 1 >ft valvo of a spctinien fioni st.itiou IHti; x Id.
Xeiloiiillii s II ho rut a \'orrill ami I'.iish. p.H7X. Kxiorior of I'-lt v.ihi- ol' sin-ci-
nii'U No. 3l82h; x 11.

10.

PiATK i.xwr.

Fi;;. 1. r.cilella piirni \'iTrill ami lliish, p. s.")7. Iiitfrior ut' a liuht \al\i' No. 7.'<l'iti.">;

X 2.").
2. Xiiciiht firaniiloiu \'errill, p. S,")l>. Min^rc ol' right x.iivi- of ty[ir spi'iinu'ii No.

38451; X ahont Iti.
'^. Xiimla ciiint'llittii .lolVrcys, p. S.'il. Hiiitjo >!' right v.ilvc ol' spfi-init'ii No.

l.")79r); X iilioiit 13.

4. roldiiUa hnti Ilia CSlnWov) y.irlety amhii'i \'iri\\\ ami linsh. j). .'^Oii. Intorior

of a right valvo from station ist!; x ll.'.

5. YoJdicJJa Jeffrcjixi ( liid.aigo), p. 8tJ<i. Interior of right \ alvo of sfiocimon No.

78a")S; X ahont 13. •

f>. Xiiciila proximii Say (f) varioty ovuln. \'orrill ami Knsh, ]). x.'iL'. Hingo of
right val\o of spocimcii No, 7.'i4ti7; X about 10.

7. LuliUa mcHSiincnHis (Scgnoiiza) variety Kiihleria Vorrill antlMiish. p. s.")i). llingo

of left vahc of spocinnn No. :!.">l.'lL': x about 1(5.

8. Xiinilii siiboriita \'eiTill ami Miish, p. 852. Interior of lel't v.ilvo of tyi)c

speoiuien No. 40174; x about 13. Showing rosilinm attaclieil to jiit.

9. I.aliUa Hifs.sd »('««/» (Sogneuza), p. 1^5;. Ilingo of loft valve of spooimon No.

52156; X about 16.

Nf

892

-3^...a x^^sifirsmassemmm

ri;nri:i:itix(,s or r/ir: x.itioxai. misffm.

vol.. XX.

I'r.ATK l.XXXII.

Fi^. 1. I.cdn tniKhihi i Doiiovnii i. ]). SV,. IntiTioi' oi' rii;lit v;il\o (if spcriiin'ii Xd.

;!H2()5; X lilioiit 5;.
•J. /.('(/(( 7)r/'>i» /(MMiilli'i I. p. S.V). Iliiiup (if rio-ht \-;ilve (if siiccinicii Xo. 7;!it77;

X iihoiit ."li.
;{. XiilDiirlhi siiliimdii A'crrill iin.l Hush. p. 87s. Hin-c of l.'ft v;ilv(' of sjicii-

iMcn \(i. ;!i;!2tl: X iilidut 10.
■I. 'I'll!' siunc. 'I'linied nji to show shii](o of Icctli.
"). ]'ol(li(lla iiijlatd \ onill mid liiisli, ].. MM. Iliiio-,. of a ],.fr valve Xo. ;i,V.7.-,:

X about 10. Turned up to sliow slmjie of teeth,
ti. rile . 'Hue. ]■' rout view.
7. )'iiUVi(Ufi dinniniiris Veirill and I'.ush, ]i, ,s7i>. lliuye oif a left v;il\e \o.

liSIUI; X I'O.
S. )'o!(li(n(t fraierud VvrrW] iiiid I'.nsh. ji. ^17. lliu!;c of li-lit valve of i y],,.

s]i('(inien from station ill7; X -'0.
9. Laid himhiann \'eriill, p. S.'il. Tlin-f of hoth valves of type .s!)e(iinen Xo.
;!."i7-'lt; X ahout (U, .

10. MdUctia polifn Vcirill aud Hush. ]>. 87(i. llin.ue of a left valve Xo. 787!tL':

X ab(.ut ()L Some of the teeth are hrokeu away Just liohiiid the heak.

11. Yiildklhi iris \'errill aud IJush. j.. SOS. lliaric of left valv(> of a y.mui;

sj)eeimen ; X 20.

ri,.vTK LXXXIII.

Fiy. 1. CrriieUa J'nt</ili.i Verrill, ]i. 817. Interior of ri,^'ht valve of t\pe speeiiuen Xo
Xo, 1154:); X ahout I!.

'J. Thesauie. llin.uo of another larger, inijierfeet -specimen X.i. I(m;7G; X ahout S.

S. YohUiUa JefireiiHi (Ilidalyo^ p. SiKJ. Kxterior of a left v.alve Xo. 7sa"8:
X ahout IS.

•I. Limopsix i)i(>/iniiiii()hi Verrill and ISush, ]>. S47. Interior of a rij;ht valve of
a young specimen Xo. SSI IS; x about S.

."). Xiiriil(t mihorata Verrill and liush, p. SM'. Kxterior of left valve of type
speciuHMi X'o. 40l7t); x about IS.

fi. -/7'rrt /«)».'/;<r////8 (Seae(^hi) \;iriety unurinnia Verrill aud IJush. ]>. 77s. Inte-
rior ol' right valve of si)eciinen Xo. r)L'17(»; X about S.

7. TJie same. Hinge of both valves of the same specimen ; x about S.

l'i..\Ti: LXXXIV.

Figs. 1 and 2. ChlanniH hi'iirtUcli XvrriU ami Ihrsh. ]!. SS4. Kxterior of lioth valves
of a young sjieeimen foiiml among I'oraminifer.i ; X 20.

Pi ATI- LXXX\.

Fig. 1. Ci/clopecfen hptdhiis \errill. ]>. SSO. Tortiou of upper or left valv(^ of type
specimen Xo. SS41S to show character of sculpture; x 10.

2. Cycloprcteu ixtiitis Verrill and liush, p. 8S7. Kxterior of lower or right va]\t^
of a young specimen from station 220.">; x •">.

S. The same. Kxterior of h ft valve of a larger siieeimou from the same
station ; x ").

I. The same. Hinge of tlie same valve; x 13.

."I. r'l/clopccloi j)usti(l<mii!i ^'errill. p. SSii. Portion of left valve of sjieciineii
Xo. 4S7*>."'i to show character of sculi)turi' ; X 10.

(>. Tile same. Piece of a left valve of another sieMinu'ii Xo. 487(il to show vari-
ation in form of i)nstnles: x about IS.

7. ('innploiifctin (/rii n!(iii<lic<( (Sowerh\ i \errill, ]>. SS7. I'xterior of right \alve
of siiecimen Xo. 78S87; X •">.

I

I

Kii

J

NO. 1130.

Fig. X.

DEEl'-WATER MOLIASCA—VERIULL ASD liU^H.

893

10.

11.
Fijj. 1.

3.
4.

n-. 1.

Fig. I.

CtjcUipviiiii Kuh'tnitiv'it'ir XvYvWl iind liu^li, ]». Sl(». I'lirtioii dl' left v.iKc of
spcfiiiieii No. isTlL' to .show cliaracter ol'.siiil|ituit' ; x 10;

The saiiic. Exterior of left valve of sjieciuieii No. lM7t!<> from oil' Nova Scuii;i,
ill li)0 ffitlioiiis; X :!.

<'il<Iopt'cU:n ihisIiiIdsiis \"('irill. ]i.><)'«0. I'.xteiior of left valvi- of tyjie s]ieciiiieu
No. ISTlil; X ;i.

'riie same. I'xteiior of liuht valve of aimtlier s])eciiiieii ; X '■>.

I'l.ATi: l..\.\.\\ 1.

Suleniya grandis \'eirill and Hush. p. xXTk Kxterior of left \al\e ol' typo

wpeciuien No. ."'ill51.''>; X 11.
The .same. Inteiior of ri<;lit valve of an imperfect s]ieeiiiieii No. lOlOli; x lA.

Kpidi'rmal fringe re-stored from other specimen.
Cri/ptodon {Axiiiiilu>i) pijiimnus Verrill iiid I'liish, p. TIL'. Exterior of left

valve of .s|>eeiiiien No. 7S3(!S from station liiiHT; x '2-.
The same. Interior of right valve of a smaller specimen iVom the samo

station; X '2-2.
Xiiciild iimvilldta .Icllreys, p.s."j|. I'.xtcrior of Icit valve of s]iecimei) No.

I.">7IC); X 12.
('hhiiiinn costilhitii X'erriil and Hush. p. M!."i. I'.xtcrior ot' right valvc of tvpc

sjiecimeii No. .jl.'l71 ; X 0.

l'i..\ii: I.XX.Wll.

Porotuiid ,s('///c((N X'eirill. \aricty micnidiiiila l)ail. ]>. si;i. IiiiiL;e ot' a left

vidve No. 7.S71IU; X •">.
/'(•/•//('(>/•(/((( !ir<titiitiji ra (\errilli Hall, p. Slti. Iiilerior cd' a left valve (typo

S[iecimen> No. llSoS; x I.
/.^/o»,si(7/(( .s(/^(; 7(((//'((/(( I .letirexsi. p.S17. Interior tif u left valve No. 7SS00;

X 10.
I'cripliiiiui tiljiiiis X'errill and riiisii. p. SL'L'. l.xteiior of right \alvc of t.\ i)o

specimen from station (S7I>; x t.
I'erijiloiiKi iiiiiltihtta X'errill. ]i. (Sl'LI. Kxterior ol' left \al\e of tyjie .si)ccimeu

No. IIS 10; X 1.
I'roptumimiiini thiiUi8siiiii,n (l)alli Verrill, p. Sll. I'.xteiior of uppir or left

valve of a spceimeii from station !M!I; X 1<>.
t'fjiptodon ( Aj'iiiiilug) J'trnKjiiiosiix (Forbes), p. 7iK!. Interior ol' right valve td'

•specimen No. olStiO; X 1-'.
The same. Interior vf left \alve (d' the same specimen.

I'l.ATi: I.XXWIII.

Cnjptodon croulhufisis (.letlreys) Smith, variety alius Verrill and Hush, p. 7S7.
Kxterior of a left valve from Kastjjort, Maine, liSTO; X ahoiit X.
'2, The same. Interior <d"a right valve from the sam-^ locality; X abont H.

3. Cnjptudoii jthviiin X'enill and IJnsh, p. 7s8. Interior of left \al\t' of type

si)eeiMion I'rom st;ition l'.")l ; x M.

4. The same, {exterior of right valve of the same K]iecimen.

5. Xiifiila j)ruxituii S.iy (?) variety oratu N'errill .ind Hush. p. K")2. I'.xtcrior of

left valve of speeinion No. 73lli7; X alioiit 12.
(!. Macoma iiitia'- liavvson. jt. 77S. Kxterior of left valve id" s|)ecimen No. .'>J427j
X 3.

7. Kitinerlia hrerin \'errill and Hush, ]». SiM. <i. I'.xtcrior id' left valve of speei-

luen No. 40232; b, interior of right valve of another specimen No. I.">.SS4;
X 4.

8. Xiicniu uraiiiiliiKd Verrill, ]>. 8,'")3. K.xt<irior of left valve of type specimen No.

38451; X about 20.

894

I'UdCKEUlSCS (IF Tin: x.iTiox.n. .vrsiii M.

ViiL. XX.

Praf"

I'l.ATi: 1,.\.\.\I.\.

V'\'fi. 1. Vnjiitiidon ohsdh'liin N'crrill iiml lliisli. [>. 7>^!'. I'xtcrior oC li^lit v.ihe of a
ispeciuii'ii IVuiii .st:iti(>n !M!l; x alMnil L'o.
1.'. The saiiR'. Interior nt' lilt \ alvc nl' tin saim spiciiniij.

;<. Lcjitu.iiniiii tniinihix Xviv'iU ami iiii^li. ]i. ~\*~. lliii-i' of k-l't vahe of type
spei'iiiiiii No. iriliSl); x I"'-

4. Till' .saint'. Iliiiiif of ri^ht vah »• of the sann- s])cciincii.
"). 'I'lie same. Interior of llie same valxc : x ;>".

(). Cr/ipldddU iiliciiluH X'errill, ]t. ~!*i>. interior of left \alve of a younj; specimen

No. IISL'ti; X 'J.
7. <'r;ipt<)(loii [ .t.rhiiili('<'\ hieria \'(.'rrill and Iinsh, p. Tltd. llxterior of leli \al\e

of lyjie specimen from station l2-I(W; X :il'o it -'2.

5. The .same. Jut lior of ri^-ht val\ e of the .same s|ieeiiiien.

1'1..\T1. XC.

Fiii'. 1. ( riiptndoH (.Lrhuiluy) incijiKdi-s \errill and 15nsh,- p.7!'l. Kxteiior of riulil
valve of tyjie si)ecinieii from statioes li^-idl; x ahoiit UK
'2. The same. Interior of left valve of the same specimen.

li. ('rijjiludiin rroiiliiuiifiiti (.lelfrevsi fsmith, p. 78(1. Interior of left \al\e of a
speeimeii from stations ()2-(i.") : X aljont II!.
The same. I^xterior of riuhl \alve of the same Hpecimen.
.tjiiiiidon t lliptii'iin \'errill and Iinsh, p.7!Mi. Mxterior of right val\e ot' t'. pc

siieeimeu No. I!")]".") : X ahoiil \',>.
The same Interior of lel'l valve of the same >iiccimen.
I'dlhiiiid /(rrHtjiiioKii ^^l(mtagn), p. 78:>. Interior ot' lelt \ ah e oi' s]ic( iiiien

No. lir>SS; X I'd. (/.Cartilage.
The same. Interior of right \ iih c of the same specimen.

I'l.ATi: X( I.

('ri/ptiKloii iiiSKjiiis \'errill and Bush. p. ".*'•''>. Interior of a lett \alve No. .").'733

tVom station L'lltt); X ahont li.
The same. I'.xterior of a let'i \alve from the same station; X ahoiit U.
AIinitmiiiK trhitnlia Verrill and ]$nsh, ]>. 78J. Interior of right valve of t.sjie

specimen from station 21507 ; X -I-

1. Mdiitiiiiild vitiietilti Verrill and Hush. j). 7sl'. Exterior of right valve of a

specimen from stat ion Jl'7S; x 17.
"). Ci-jiplodoii ((iiialix \errill and Hn>h. ]). 7><X. Hinge of both valves of a speci-
men from station IS IUuIh : x ahont .">.

6. Tiie same. Exterior ol' left valve of siieeiineii No. 7i:>02; X aliont .">.

7. Cniptodon (Ariniihtti) orittim \errill and IJnsh, p. 7!.t3. Interior of left vahf

of type s])eeimen from station !l|!l; x li").
i<. helliellii tiitida Verrill. p. 778. Interior of left valve of speciiueu No. .S71I71;
X 11.

ri.ATi, XCII.

Fig. 1. .h-inodon (lliptiviis ^'errill and Bush, \\. IM. Hinge of left valve of type
s]teeimen No. IJan."); X ahont l'(!L

2. I.imopxin Hiilcuta \errill and llnsh, p. 845. Interior of a right valve from

station 21!n); X 4.

3. Criiptudoti (A.rinnliix) Himphw \'errill and Bush. p. 7!U. Hiuge of right valve

of type speeinieu from station 10!t3; X about 13.

4. Tho same. Interior of left valve of the same speeinieu.

5. .Lvinopsia iirhinilala Sars. variety iiuuiutilix \errill and Bush. p. 7!I4. Interior

of left valve of type speeinieu from Eastport, Maine, 1872; X about 13.

Fig. 1.
3,

«r

Fig.

NO. Ii:i0

ii/:j:r-tr.iTi:i; Mni.n'siA—i ki:i;u.i. asi> m sii.

SI I;

)

Fiii. (I. Tilt! . sunn-. IliiimMif liotli valvi's of the siiiui' sitcciiiiiMi ; X atioiit !.'(>.

7. Motihicidd hiiliiildtd ( Mont iiffiu viiri<'tv tenuis \fnill iiiid I'msh, p. 7"!'.

liitfi-ioi 111' ii lijrlit \m1\<' froii! stjitioii L'l.'77 ; X nlioiit 111.

S. Montiiiiild hiilnildlii {Mimtn'^n^ ynr'ivty friuiUiH \rn\\\ mid Hush ]l,7^tl, Inii'-

rioi of a liiilit \iilvcNo. Iiilol; x 17.

II. Moutdviitd "laid .lotVicvs. \>. 7M. Iiil('ii((i- ola liulit \alvf No. ItiLiti; x -U.
10. riu'samc. Interior ol'a left valvo No. I(ii;i7: X I'H.

t L

l'l..\TK .\('I1I.

««

I'i;;. 1. ('riij)liiihni { A.riiiiiliit) oratiix WmtIII and liiisli. ]i. 7'.i.S. lliiii^c ot" liotli \ahfs
of t\j)i' siH'ciiiicii from station iUH; X !•").

2. KilHopnis chvdtd (Siinipson> NCrrill and iinsh. p. 7M. lliii^f nt' ,i liylit

\aivi' No. 7K>:);! I'lo n \ausli(ni : x l<i*. <{, U'csilinni and ossi( jr.

3. Thf .same. llinye of anotliiT right \al\f iVoni tlic same station, to slio\v

vaiiation ; x I^D.

I, Tbe .same, llini^eof liotli valve- of anotlier speciineii from the same stat ion ;

X ;!!'.

5. Moiildtidd ciiiicdtd N'eiriU ami ISusli, |). 7>'-'. llinue of lioiji \:il\i'-. trom
station l''J7S: x .'iO.

li. Moiitd<ul<t tiniiitliild .lefVieys, n. 7Sl. Hiiiiie of a li tt \al\e No. H.")!!:.'; X ;>''.
a, Hesilinni and ossicde.

7. Moiitdciild hideittdid (Montauin. ]i. 77'.'. llin<;t' of a riulii Nalvi No. 7ISl.'>'
.'Voin Naiishon ; x •>".

s. The same. Hinjj;e of lioih \alves of a smaller s|iei'imiii lidin the same sta-
tion; X ;io.

II. Moiitaciild xtridluht N'erril! and Iinsh, j). 7so. llinue ol' a iel't \ai\f Iroai

station U'27ti; X IS". Hinge of a right valveTrom statioti l.'L*7l{; x ;>".
111. h'lllicUd nitidd X'errill, p. 778. llingo of lioth valves of s]»eeimen No. :>71'71 ;
X 1-. Right vahe turned down, hd't tnriu'd uji

rt..\Tf. xciv.

l"ig. 1. Moiiiaciild tdiitiditid .let'tVev s, p. 781. Interior of a left valve No. :>."i|lL'
from station -MdH; X 20. «, ]iesiliiini and ossiele.

2. 'J'he same. Interior tif a right valve frinn tho same station; X 2ii.

;{. Kellid siihorhienhtris CSlnnUxixn). \). 77!l. Interior ot'left valve of a spiM innii
from oil" 8alem, Massaehitsetts, lf<77; X m

I. I'ho same. Interior of right valve of the same sjieeiiiu'ii.

r>. .]fi)iitd<tild cd^td Verrill and Hush, j). "'^l. ICxterior (d' a left \ al\ >• from sta-
tion 2283; X 2(1.

ti. Miintdiittd h'idcntitid ^MontagnK ]i.77!t. Interior of a right valve No. 7ll)2S;
X ahont 13.

7, Kelliojisin elcvata (Stiinpsdii) \'errill and Hush. ji. 7SI. Interior ol' a tight

\iilve No. 71333 from \anslH)n; x about 13, d, Ktsilinm ami ossicle.

8. The same. Exterior of a left \alve from tho same station; x ahont 13.

Pi ATK Xt'N'.

Fig. 1. /-_i/o»i»i(i ,'/»'(JHi(?//Vr(j Verrill and Hti.sh, p. 818. I'.xterior of a left vaht-ttypu
speeimein No, r)2.">61 ; X ahont 2i,

2. rfiticonlia grdiiiili/irn (N'errill) Dail. 11.8II), Hinge of a lelt \alve itvpo

spei'imen) No. 4-1838; x 8.

3. Tlio s;ime. Hinge of lioth valves of a fully grown 8pe«dnien No. 78ii7!t; X 4,

Turned nj) to show ossii le. d.

4. The same. Hinge of a right vahe of another speeimen No. 78'.t2l(; X t)<.

it

/

"• 'nonxirliu runinio \eir

'" ■■""' 'i'lsl,, ,,. ,sis

OL. XX.

" ""• •'^^niM. .stall,,,,:

'^ -• " ■'■ "■■■« ■"■■■•-- - i „.v„.,„,,.

•'«■■ 1- r.i,„<,i,His s„i,.„ia V,.,.,

i'lAii.: .\c\I.

-'""'■"'"*.,?,,,„„,„„„„,,„. _, •' -'.I" -m. f,,„„

« A 0.

^'•^ !;';-"- ^'';:'nt;:;:';:-,r-- .

, "^■^''■'; X K;. • '•''■^'^- '"''■'""• <'/'ri«ht v.Iv,. <•

, ,. V/- ^'-i-n X.,. ,, ^' ;^"; , ' = -''• V. ^75. rnt,.n „'',. ''•,.,,,^ ,

'oti, vilv. .• "-'"" ■••11(1 J„sJ, s...

I \ I ) !•: X .

[ Ilii'.icizcfl tinurcs ms ^'^

iclcr 1(1 piijirs wliiTr tlin M;unt' is ilciintil, (ir wlii'i(> iho ilistriliutimi nl' the
sin'c'ii's in L;i\ I'll, i

AliiM 7Ti>

li.lii;i,'iillis 778

vMi'. aiiii'iiiiiiiii r.V

All I ana (<85

Ailiaiiilla 77(i. \.7V, 885

I'asia v:v

.TCiiiiipfctcn. iSn'olxo I'l'i'diii v.;(),s;;3

iiTaitiaiis >*'M

iipi'l'riilarirt 8:ill

Aiinisimii. {S,r(iln(i rrcli-in S.'i;, h'Jl), SHI, SHH

rcm'stratmn SU

])li-iiriiiir(ti'H >'-'ii

s|i 811

Aiiinsriiii|M'iti'ii >^'S't

liiirilii;aliMihis s i:i

Aiioiiiia S'J8

Ai'r:i ail\ i-i:<iili-ntala .«VJ

aiirita f*4ri

caiulata 855

lii'teroilonta 842

Jifrlulli'uliiillrs 845

pi'iifiiniliiiila S44

Arciil;!' 842

AHtarti' nana ."W

A SI art ilia' 798

AxMiiiiluM 770, r.''-', 797

iiiipticus 7yr>. ma

Ax amps is 7V<i. 794, 705

riiiilata 7''.'

nrbiciilatn 702, ,'.''/

var. iniM|uali.s 7:'t

Axiniilus. (>■<•■•»/(") Cryittoilon) 77ti, ,".■«(

Inwis 7:iii

Axinus 784

rripiiliin'nsis 786

riMiMiginosus 791!

liarliatia 842

Uathyarca 77G, S4J

abyssorum S-l.t, 844

aiioinala 84:!. SI I

rnli'lin nsis 84!!

tllarialis .'•4:!

ylonienila 8i:!. 844

iniilata 84;!

inaM|iiisrul]ita 84;!. 844

pL'Ctiinruliiidi'S 842. 845

var. I'lTniiljita ... 843

IViilei 843

graiiili.s ... 842,843
orliiciilata... 84:!
srjit iMi t r i II-

iialif* 8i:!

]((il\('y «>a 843

Proc. N. M. vol. XX 57

I'a^'.-.

Ii.it liyana profiniiliinla i 81:1. v; (

pllTiirssa s|:!

I'll' lit liana 77i'i, .-42

ail\ I'lsiilnitata .«12

asperiila HiJ. S4:!

Hfiiirinata Sli;. si:!

r.ornia 77'.>

Calliirarilia si 7

I \'i'siciini\ al il.'iUi f\~

('aiiilitnncrti's. i Ser iiho ]'i'rti-n) .... 770. > .'^, s-.';i

ari'iiatns s'.'S

i;iii nlanilii.'a •< .7

lins , s-.'8

.St rial lis 828

tiiiriiiiis s;28

( 'anlinlavia s.'.l

Caritiiiiiiya 77i'>, 7'.i8

a.liyssinila m"!

costellata 8118

\ar. riiipiilrlita HII8

rlll'ta 8118

gemma .^".''

glyjita v/'i

miilticDstata 8i>7, .Vi'V

(irnal issiiiia .
piMTipstrata .

"]>

striata

Cctorhiinra.

at\ plia
iiitiil.'i ..

(,'rtllllivn

sp.

.'<lil

sii;i

8119

81I8

770

^/(

S15

770

s ;.■>

Clilaniys. (S<'i' ahu I'l'cti'n). . 770. .S'.V. 8:!0. 8;!1. 8;!3

lieni'ilirti ^..';

ilinlDnius 8:!l,s::;8

I'listcllata i.'.i

islanilica 827, s;i4

varia 8:!4

Cliiiri.stoilon / rauci'Uatus 77.^

f'laiisina iruulinrnsis 78t!

Cliiliiipliora 770

goiiUliana 820

iiiornata v;.7

t riliiii'ata 820

Crcni'Ua IVaKili.s vi?"

Cryptodon 770, :st, 785, 795, 797

( .\ xiiHilii.s) liri'N i,s 7!H)

iToullni'iiHi.s ."v;

\ar. altii.s rv7

(Mlitalis 7s>i

(Axiniiliis) torruginoMiin r.'i.', 794

tlfxuosim 784, 788

897

MOS

niocKKDJXcs (tv Tiir. x.iiKix.tf. i/r.s/.r.u.

Viil.. XX.

Page. I

( j\ |itiiil(iii ;;Hiililii 787, 788

t;iiiiiilis ;i'

( A\iiiiiliis) iiiciiiiali.i 7,' J

iiisi<;iiis 7V.'

<l)lSI>ll'tllM 7Si>

( AxiiMiliisi ovitlns T'JJ \

]iliimr rW

Iilicaturt rv;

(Axiiuilus) ]p\ u'liiii'iis 7;/.'

siirsii 7Hu, 7Sli

( A \iiiuliis) siiiiiilix ;.'/

• ,sii1m)\ iitiis I'Xi

tiirtmmiis 7',i;)

( ly I)t(Ml()Mti(lir 7H4. H.'il

'iiiMMliiiita 8511

CtciK diiiitidn' *>"iO

Ciiciillariii 84'-'

liitiiiHldiil.'i HV2

('M(iiili-llili;i- 8.)1.88il

Cii-iiiidariu 77li

ilictica Klllt. ^'^.'

v;ir. ;;l:iciiili>, 8iiU

(i)ni:os;i ,vi.;

frnliM-ii:i 801. 802. So.!

<lUi\.i]iti 790. S'«/. 801, 802

laiiiclldsa ,".'.''

iiifdia S'«i

iilp.'Si! 801, 802. 803, S'll

liai'Vii sill

pclliicida ^".1

ro.st rata 709, S""

,siit('i)ita sun

tiii;;i(la 7/'.''

uiiil.ita 7.''S'

vi'iit i'ic().~ia s'".?

Cusiiidariilii- 7."'

('\ aiiiiiiiii clfv atiiiii 784

('yci(p|ierlcii. (Si'enho Viiti'U) 770. 820. ^.;.'

iiiilirifiT 8;!2. 8:!0. 810

keriiiadcccnsis 81 1

Itptak'ns >■''.'

iiauu.-< ■''■•'7

l>iistiil()siis 8:12, s.::i

.■iiibimln'itV'r '^4"

Ili'htiiJcctiMi 827

I>i])l()di)iiti(la' 7.'^4

Krvciiiida' 779

l'ili|ii s 8:::!

Iicsiviis 8:;:!

Flai)illi|,i.ririi 8;i:i

llaludliformis 8:):)

Kli'MipiM'lcii 8;!3

lli'Miosiis 8:!.')

Cl.iiiiida' 'Sir

(iloiiiina' 847

Glomus ">'.'

iiiaiiiiilateralis '^'■'^

.iai)<irii<'u.s **i*^

jill'ioy.si **'S

iiitcii.s 847, s4s

.siiiii)lox 848

llaloiiyniplia 77fi, 798

ilaviculata 811

(itriafella ■*'" ;

Homipet'ten ■"'•'* ;

loi'besiauus 828 I

I'a'.'o.

1 1 inn i tcs ^ ?:, ''28. 8:J3

Iliiiiiitcs i(irifs.<i 827

Hyalopi-cliMi (S,;' (il.s'1 I'rctiiii 77li. •».;.'

dilictiLs 8:)2. xi5';

fia^'ilis 8;)2..s'.W

I II id ii' IIS 8 !2, 836

II nil am i 8:i2, 830

.Taiiira 82ii

.riiiKiiiia 8."p.i. 884

•Iiipilcria 8.84

K.llia 783

siilioiliiciilaii^ 77.'"'

Kcllii'lla iiiiida 77!)

>p 778

Kclliillida 778

Killiupsis 770, 7*J

clcvala 7*^4

K.M.iicrlia 770. 822

liicvi.s s:'/

};hu-iali» 821.822

l.fda 770, 849. 8.".0. 852. ^ ' (. t>.''7, •-77. 878. 884

aniiiiiiiata 8.">0

Ini.sliiaiia ■'''.'/

caudala 8,')4, sr..',

cii.spidata 8.'i4

(•\l)ansM 871

tinviatili.H 8'>4

.ji'llVcy si 80ii

lata 8r.ll

Ii'iiliciila 8lii;

liii'ida 801

liicssai It'll si.s 8."'!

ohcsa 8lil. ^r.:;

pcriiula 8.')4, ^.".■

jioitlaiidica 8.")7

rn.strala 8.'i4

mili('i|iiilati-iii 871

tciiiiisiiliiila 854

Lcdella 770, S5:i, 884

1 (iiitiiiis 8."i0

Cdiil'usa 850

ino]iiiiata 8."0

iiiessaiM'ii.'*!'* 8.")5, S.'i',

\ :iv. .-nlilr\ i.s ',.':/;

niriilr;!' 8,"),">

p.iiva .S.'7

jM'iallini.s >;.",.'i

pridata 850

rrctidorsat.i . 850

Kt'intMi 8,'>t), 857

Hiiuiiiula 855

Holidiila 850

ultima 850

I.odida- Sis. 851, 854, 884

I.<(liiia' 8.51, 8.54. 884

Lt'ptaxiiiii.s 770,7.'";

Hi ill Mill.- 790, 7.'. 7

l.clilonida' 770

Leplopt'cttMi. (Si.'iihi' I'fiirii) ^.?;

iiiiiiiiiliiiiii is 831

I.,iMia'a subdvaii 824

Mniatiila 770

conl'iisii H25

liyaliiiii s'/'i

iiodiili'si j.\'4

ro.'iuliu'is SSJ

ifiicoi

oi:

CI

c\
<lii
oil
I'a

.SMI

Jrallflina-..
.Martisiii ..
.Marte.siciiii.
(
^le^'ayoldia

Microyoldia

SIoiitaLiita..

1'^
778

3, r«

0. 822

,s';'i

1.822

'K. «84
8')ii
.s,-(

54. •^■••'

8.-.4
871
8-. 4
80ti

8lii'.

8r>'i

8i;i.8l"!
S.')4. V- -

. 8:)7
. 8:.4

. 871

8r)4

,s5,^, 884

l-.'lli
8.'<'i

8,'):.
8r>i'>

8."i0

I grit), 8ri7

8.').'.

8r'i;
8.'ir.

I 8.-1 1,881
I >^-A. 884

79ti, .'■""
771t

831
824

770
82.-1
S?'
f.'J
S2J

nm. u:ii>.

DEEP-WATER MOLLrsCA-VEIUlI LI. ASH III s/l.

S!)9

Limutiila .suliovatn.
Liniidif

I'a;:c.

, . 824
. 82:i

LilM(il).'<iilir 84")

Liiuop.si^i 776,851

aflini.s 1 /'■'

aiiiita Kti:

vnr. pliinii 84i"i

var. .' 817

iiiinnta vl'

Iiliiiia sii;

lirofuiulifdla ^ /r

HP 84<i

sulcata M ■

Lir<i](e('liii 82'.t

Lis.siichlarays 8;!;i

i-xcisa 8:i:i

Li.s-opfL'liii. ISieatio I'ectiiii ^.J"

hvaliuMs 81(1

l.yiiii.sia 7711

ai'fno.sa 81 It

graiinlircrn ■■>;')

L.VdiHida' 818

L,\ onsirllu 7Tl"i

inrdatii ^/^

subqiiadiata ^17

Lyoii.siillida' 817

Lyrodesina 8.-)l

LyiddcsinatiiiM' S.'il

Lyiopi'ctiii. ( .*>■('<' uIkii I'l'cteii) s'.'.''

nddiisiis 8^9

Mai oiiia 770

iiillata r,"s

Maci'dililaMiy.-^ >i''i

latissiiiia 8:i;t

Macriidiiii 842

a.spcriila 842

I)i'iit'iindi('ola 844

sagrinata S12

Mallftia 776, 850, S:3, 878, 88ii. 885

abj-.-isoruni - 874. s:',

ajiatUida 88.1

amabilis 880

anoiiana 874

bfUardii 874

cliileii.si.s 8711, 874

ciineata 874. 883

cytbtTfa HiH^

(lunkfii 874

obtu.sa S:i

pallida 874

]K)lita 874, vri;

miiitliii 8ci3

Mallet ina' 851, 873. 885

M ait.sia 777

Marte.sicUa 776, ,T,"

frajrilis ",'

Mt'ltayoldia ST;/, 884

tliracia'fonnis 8.51), 860

Microycildia 776, V',V), 884

rogiilaris s(,y)

Moul acuta 77C, 783

bidontata 77^1. 784

var, tVa^jilis 7s('

var. toimi« 77H

bi)\viiiani 78»

casta 7<t

83, 784
783

7-«;

TaL'.

Miiiitacuta riiiicata

il.vala

Irniii;iii().'-a

ovala

Mtriatiila ;^()

triciui'tra ^;^}

tumid Ilia ">/

Mya liidfiitala 770

M yoijeia 770. 71)8

K'S''i"<a "ill

limaliila nl>

paucistriata 809

liri'liosa ,s;/

iiii;i?iii8,i sll

iiiidata 7il^

Mytilida' 847

Xeaia a ret ii;i 8U3

costata 810

gi;;aiiiia 811

jllacialis goo

laiiiclli..-*a 799

liiiialula 812

iiiullii osiata 808

var. ciirta 808

()l)e.'<a 8(»4, 805

paiici.striata 809

l)i'Ilii(ida 8114, S05

prrriLStrata h09

rost rata 811O

riii;inusa 811

»\< 80.5

siiblorlii 8116

uiidata 708

Nfilii s,-,'. H85

ciiiiiiimii 877

KDliiura 877

XeiliiiU'lla , 776. ^^^, 885

corpuli-iita 877. 878

l>iisici 878

(iuadrani;ulaiis h7$

SLTicea 878

stibovata sTU

Nuciiiella 85|

Xui'iila 77ti. !H9. 85o, s:.i, 884

h.-,4

K-,.3

866

851

853

S53

caiicc'llata
):raiiuln>a
lent ic ula ..

II mil' us

|icriiauil)U(('ii.-<i.s

prnxinia, vai'. ovala

subnvala s;?

tenuis 853

tri^diia 853

verrillii sri3

Nuculaiia 851,854

Nueulaiiicla- 85-1

Nueiilidie V/V851.884

Xuculiiia s.:j, 884

adaiiisi 851

lalabra 851

niili,"ris 851

iiiuiiita .
o\aUs ..
Huleata.

Nuciiliiia'
Nuculites

851
K51
831

834
850

,1 t

!ii

-Ir

J

90<»

i'iK*tvEi:i)ixt;s or Tin: witiosm. museum.

V'lL. XX.

N". !l;;9.

Oiiportfll fi:i;!

(»ii|if('t(n iiitiiiHliiiiis 8:t:i

Ortliiiviildiu >sv'.''. 8M5

sr«|iiii:i (<r>!l

stilciKiidcs 851)

I'alH iimild S4!l, H5ii, H'll

loiislrirtii S'lU

I liana M.lu

I'aUii>liiMi. (Sii'iiUo I'cctriii 82H, x.','/, tiH3

-tiiatiiiii ^'Si

test if si:;i

vitit'Min 8'J'.I

Tall i mil. iSicalno I'cctcii) ,S',',". S'J'J

plica 827

raiiilnia 82 1 . K2J

rostrata H\1'2

Paii>lciiic!a' AH)

I'ara;iiiiMiiiiii s.l:

ilalli 8:!2

I*ar\aiMiissiiiiii Ki3

raiiicllatiini 833

r< !■( Iiicilia L'lamilil'cra SIO

•siiljciuadrata 817

IVi ten s.v;, (S27,83;i

liiiiciljcti (<'lilaiii.\s) s;y4

cliiitoiiius (I'lacoiit'ctcn) 831,838

ripMtillatU.s ((Jlilaiii\ S) >;W

dilectiistHvalopt'ctfii) 832. s.:i;

f.VDticiiiii (I'siuilaiiMi.sinrii) «28

riiie.stiatus ( I'lippoaiiiiisiiiHi) 821)

tVav:iliH (IlyaldpeclLMi) 832, AJ'j'

lL'riiiilaii<li(!a (('aiiiptciiii rt(s) S,37

liiiskyiisi (I'ri(piaiinisiiiiii) 83!), 840

var. pii.Hlulo.'iu.s 83',l

livaliiiiis ( I,i.s8oj)i'(tL'ii) 830

liiilirilVr (Cycldpectcii) 832,839 XiO

iiiii-ciui.sciilptiis (I'ropi'aiiiii.siuin) ... 82!)

iriailiaiis (.K(|uipii'teii) 830

isliiiiilirus (Clilaiiiys) t<27. 834

kiTiiiadi-censis (Cyclopt'clen) 841

k'li.-i (Caiiiptonoctcs) 828

lviitali'u.-< (Cyt'lDpcctcii) S3ii

iiiiixiiiiiis 826

iiiomitinii'rin (Leptopeotoii) 831

nanus (Cycl<)pei'l<ii) s.:;

nmlosus (Lyropcctcn) 82!)

opi-rciilari.s (.i:i|iiiprct(;ii) i^'M

lilciironcc.les (Anmsiuni) 82ti

plica (Pallimn) 827

piulicus (Hyaliipi'ctcii) 832,836

pustulo.sus (Cyclopcctcn) 832. s'.'.'

striatu.i (Cainptoiici ti's) 828

siiliiinlirit'cr ((Jy('l(ipcct(>n) '' W

testif (Palliiilnin) 828.829

tliala.s.siniis (Prnpeainii.iitini) 841

tiiiriuus ((.'aniiitont'(tt's) 828

luiilatiis (ftyalopecton) 832, 836

variu.s (( 'lilaniyB) 834

vitrcMis (Pallioluui) 829

Vat inclla S-SO

sigglici 830

Peotiniila- .W,), 831-

Pepliim «13

intk'xnni 833

Periploiua - 776

Page.

I'oriplonia allini- S,'J

iiniliilala S.'.;

Pei'lploniiilic 822

I'tliiciilida' 77.'<

PhascohiH 851. 8.-4

oval MS 8t;8. ."t

I'lioladida' 777

I'iaccppcclcii. iSif (ihii Pectin I s. /

I lint<iniii.>< ^3 1.8.38

I'lcunidim 8.'1

I'U'iiionci tia 8Jii

Poroniya 77'i

((Jfloin> a) dciiiiiata ^l.")

ILiraniilata 81.'i

niicrciddiiln .'•13

.sulilivis i<13

var. mien idem I a ^;.)

Piiromyida- t^l3

I'nitlaudia ^:.:.xM.s^i

;ni tica ^.■.7

lenlicula Mil)

lileida S>'C

J'lopeaniu.siiiiii. O'ef also IVcten) •-,','', ^3 I

iVncstiatiiiu 82!)

Iio.sky n.'-i t^'M

ineiiuiseiilpla >2'.l

lliala.s.siniini ^11

I'seiiilaniu.-inni. (.VfnJ.w Peeteni ... ->.'->. .■>29. ."ii:!

e\(iticMiii MJ8

iiiiliriler M'l

leplaleii.i 6?,:i

thalansinii.s 811

Pseiidomalletia STI

Sarept!! 851,t>.-.'j

Mpeeiosa 851. I"N'i

Sareptiiia' 8'1

.Satiiiiiia 877.8''<

Scapliarea 8)2

Schi/.othariis Tvi

grand i.-i >'i

Senu'lida' "'

Silienla 850.851 ,--5

fragili.-* ■■''

Soleniya ~''' -'i

giaiidis

SoleniiiiiN i(he

SyncyeldMema ■•'-. *''''

Telliniya liidentala ''■'

elevata ""t

t'erriifriniisa 7.'>1. >•>'

Telliiiida- 778

Tliiaeia iiitida 'IS

Tinilaria 776, 849, 8.".o, 8.11, 8fi«. S.ix. 8>.i

aciimla ■'^^'

anialiilis m'.>"l

aiala *""'• '^'•'

eallistiforinis "'''

cuneata '*"'l '■^■'

cy t lieiea 8>U. .H"!

lata '•'^1—'-

siiiitliii *'^'

scilida '■"'

veneriforniis ^"'

virens '"'' ,

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'•r'i'ordia

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' ■*'' ')/n\,i

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"'.yalis

olic.sa

<>l)tll.Sii

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807.

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liovlci

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879

878

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PROCEEDINGS, VOL. XX PL. LXXII

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PROCEEDINGS, VOL. XX P.. LXXIII

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PROCEEDINGS. VOL. XX PL. LXXV

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PROCEEDINGS VOL. XX PL. LXX

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Deep Sea Bivalves.

For explanation of plate see pages 889, 890.

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U. S. NATIONAL MUSEU^

PROCEEDINGS. VOL. XX PL. LXXVII

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Deep Sea Bivalves.

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PROCEEDINGS, VOL. XX PL. L

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PROCEEDINGS, VOL. XX PL. lXXIX

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Deep Sea Bivalves.

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Deep Sea Bivalves.

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U. S. NATIONAL MUSEU^

PROCEEDINGS. VOL. XX PL,

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Deep Sea Bivalves,

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PROCEEDINGS, VOL XX PL LXXXVI

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PROCEEDING-, VOL. XX FL. LXXXVII

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Deep Sea Bivalves.

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