PROCEEDINGS

Vol. 32, pp.249-252

December

31,1919

PROCEEDINGS

OFTHE

BIOLOGICAL SOCIETY OF WASHINGTON

NEW SHELLS FROM THE NORTHWEST COAST.

BY WILLIAM HEALEY DALL.

The

_following

forms

are

included by name

in

my forthcoming

summary

^of

^{the fauna}

^of

^{the Northwest}

^coast

^and

^it

^becomes

necessary

^tovalidate these

names by

descriptions.

Leda

lomaensis,

new

species.

Thisformisclosely related toL.minuta_Fabricius,

and

Ihavehesitated to give ^it specific rank, butit differs fromthat _species

by

the following characters: the shell is thinner

and more

compressed; ^{the escutcheon is} narrower and longer

and

less emphatically impressed; the sculpture^rises insharp thinlowlamellae, especiallyontheposterior area, whichcontrast with the _thicker, blunter

and more

irregularly distributed _{ridges of} L.

minuta. There are about _{eight large}

and

seven crowded small anterior teeth,anarrowoblique^resilifer

and

abouttwenty, nearly^allwelldeveloped posterior teeth. Length 13.5;height6;diameter4

mm. The

lowincon- spicuousbeakis fivemillimetersbehindthe anterior end. U. S. N.

Mus.

Cat. No. 208,872. U. S. Fish

Commission

station 4339, offPoint

Loma,

California, in241to369_fathoms,

muddy

^bottom.

Lucinoma annulata densilirata,

new

variety.

The

_{typical L.}annulata has the concentric sculpture rather regularly

and

widely spaced;^thisvariety has^itcloselycrowded

and

lesslamellose, giving a^differentaspect^tothe_shell,whichotherwisedoes notdifferfromthe_typi- calannulata. Length54;height50;diameter25

mm.

U.S.N.

Mus.

Cat.

No. 108,819.

Harbor

_{of Sitka,}Alaska, at station92, inten fathoms,

mud and

_shell,

W.

H.Dall.

Venericardia nodulosa,

new

species.

Shell small,rotund,inflated,solid,creamywhite,with13to15_radiating, strong, transverselynodulousribs;the surface isalsoconcentrically finely lineated intheinterspaceswhicharenarrowerthanthe_ribs;thebeaksare prominent, there^is a lanceolate small lunuleⁱⁿfrontofthem, but^{the es-}

63—

Proc.Biol. Soc.Wash.,^Vol.32,1919. (249)

250 Proceedings

of^the Biological Society of

Washington.

cutcheonislinear orabsent;the_rightvalve has alarge centralanda small lamellar cardinal toothon each side of _it; there are tworather

weak

left cardinals;the interior margins ^are conspicuously ^{fluted in}

harmony

^with the external_sculpture. Length11; height 10;diameter 6

mm.

U. S.

N.

Mus.

Cat.No.211,887,U.S.Fish

Commission

station2901,^offSanta

Rosa

Island, California, in48_fathoms,

mud,

bottom temperature^{55° F.}

Thisisclose tothefossil V. monilicosta ofGabb, which^isalarger shell withlessemphaticnodulation, alargerlunule

and

oneortwo

more

^ribs

on

the average.

Lora babylonia,

new

species.

Shell small, whitish, turrited, withaboutsixwhorls, the nucleus defect- ive,the suture_distinct, not_{appressed;spiralsculpture} ofa strong^{keel at} the shoulderand onthe base fourorfivefeeble threads,the canalwithout spiralsculpture;^axialsculpture^of(on the^lastwhorlabout18)roundedrib- lets retractivebehindthe_keel,protractive^{infront of}it,straight, forming a noduleattheintersectionwiththekeeland withwider interspaces;aper- ture shortandwide,simple, the anal sulcus coincidingwith theend ofthe keel. Height11,diameter4

mm.

U.S.N.

Mus.

Cat.No._214,192. U.S.

Fish

Commission

station3346, ^offTillamook Bay,Oregon,ⁱⁿ786_fathoms, sand,

bottom

temperature^{37.3° F.}

/Esopus sanctus,

new

species.

Shell small, lightpinkishbrown, with

somewhat

lessthanfivewhorls, ^of which one ^is composed ^of a globose

smooth

nucleus; suture distinct, the whorlsmoderatelyconvex, theaperturesimple, short,the columellasmooth, twisted,shorterthantheouter_lip, thewholesurfaceminutelyevenlyspir- ally striated. Height 4.3; of lastwhorl_2.0; diameter 1.6

mm.

U. S. N.

Mus.

Cat.No._308,958.

Todos

SantosBay,^near

San

_Diego,California.

Petaloconchus montereyensis,

new

species.

Shell yellowish white, closely irregularly loosely coiled, occurring ⁱⁿ masses, the sculpture ^of crowded concentricwrinkles _with, onthe earlier part ^of the _shell, an occasional obscure longitudinal ridge; the internal lamellaeoccur only ⁱⁿ the earlier _coils, thelater portion showsno traces ofthem;^the

maximum

diameteratthe aperture^is

two

millimeters. U.S.

N.

Mus.

334,650. Monterey, California.

Tritonalia interfossa beta,

new

variety.

Shell resembling T. barbarensis

Gabb

but stouter

and

without the re- curved_spines atthe shoulders; reddish brown, ^of

more

thanfive whorls, the nucleus_defective,thewhorls

somewhat

turrited

by

^anangular shoulder;

axialsculpture^of(on the^lastwhorlsixincluding the terminalvarix,on^the penultimatewhorlseven) angularribs, prominent^{atthe shoulder}andex- tending^tothe_canal;these arecrossed

by

^about14 densely imbricatespiral cords,subequal andequally spaced,withnarrowinterspaces;terminal varix heavy. Aperturesmall,the margincontinuous, the outerlipwithfouror fivelowdenticles internally,the_pillarsmooth,^{the canal}closed,rathershort.

Dall — New

Shells

from

^the

^Northwest

^Coast.

²⁵¹

Height 22; of ^lastwhorl _16; diameter 10

mm.

U. S. N.

Mus.

Cat. No.

46,728. Monterey, California, Stearns.

N

^oduIus palmeri,

new

species.

Shell minute, translucent brownish with a blunt apex

and

four well roundedwhorls; the suture rather deep, the surface

smooth

_exceptfor faint incrementallines; base imperforate, aperturelunate,simple,themargin^en-

tireandcontinuous Height 2, diameter0.75

mm.

U. S.N.

Mus.

Cat.

No.212,731. ^St.Paul_Island, Bering Sea;

W.

Palmer.

Cryptonatica aleutica,

new

species.

Shell large, rounded, slightly flattened in front of the suture pinkish white, coveredwithalightbrownish, spirallyminutelystriated periostra- cum,^{awhite area}surroundingthe umbilical_region;whorlssix ormore, the nucleus minute; aperture lunate, simple,the

body

^{with a coatof}enamel, theumbilicus completely,smoothly^filledwith a semilunate

pad

^{of callus;} operculum solidly calcareous, smooth, with an ^obscureswelling centrally.

Height46;diameter40

mm.

U.S.N.

Mus.

Cat. No._{217,156. Unalaska,} AleutianIslands.

This isthe shell which _{has long}been confounded with

and

distributed under the

name

ofNatica russa Gould, butthe discovery ^ofGould'stype showsthatit isa

much

smaller

and

different species.

Skeneopsis alaskana,

new

species.

Shell minute, resembling S. planorbis Fabricius, but_smaller,

more

ele-

vated

and

witha

much

smallerumbilicus;whorls

two and

a_half,pale green- ishwhite, rounded, suture deep, not appressed; sculpture only^of

more

or less evident concentricfine wrinkles,

more

conspicuous on_{the top} of the whorl; aperture circular, simple,umbilicus deep, width about one-fifth of thediameterofthelastwhorl;operculumhorny,multispiral. U. S N.

Mus.

Cat.No._271,717. St.Paul_Island,Bering Sea; A.G. Whitney.

Pantellaria,

new

genus.

Type

Megerlia monstruosa^Scacchi.

In thisgroup ^the opening^forthe pedicel in intactspecimens^is wholly intheflatorsessilevalve, as in Platidia;

when

a portionofitappears^{to in-} volve the other valveit isduetowear. Thesetwo_{genera are} uniqueⁱⁿ thisrespectⁱⁿthe group. P. echinata Fischer

and

Oehlertalsobelongs^to thisgenus.

The

_speciesare

West

African,Mediterranean

and

Antillean.