CLASS PELECYPODA 
113 
der Wirbel. Die Epidermis ist glatt, nicht filzig, die Langslinien auf den 
Rippen sind nur ganz schwach angedeutet. Die Wirbel liegen im ersten 
Drittel; sie sind stark zerfressen. Der Schlossrand ist sehr dick und die 
Zahne sind kraftig. Das grosste Exemplar zeigt die Masse. Long., .31; 
alt., .26; crass., .14 mm. (Krause.) 
Type in Stuttgart Royal Cabinet. Type locality, Emmahafen. 
Range. Arctic Sea to Juan de Fuca Strait. 
Venericardia nodulosa Dali, 1919. 
Proc. Biol. Soc. Wash., 32:249. 
Shell small, rotund, inflated, solid, creamy white, with 13-15 radiating, 
strong, transversely nodulous ribs; the surface is also concentrically finely 
lineated in the interspaces which are narrower than the ribs; the beaks are 
prominent, there is a lanceolate small lunule in front of them, but the 
escutcheon is linear or absent; the right valve has a large central and a 
small lamellar cardinal tooth on each side of it; there are two rather weak 
left cardinals; the interior margins are conspicuously fluted in harmony 
with the external sculpture. Length, 11; height, 10; diameter, 6 mm. 
(Dali.) 
Type in U. S. N. M., No. 211887. Type locality, U. S. Fisheries Com¬ 
mission, Station 2901, off Santa Rosa Island, California. 
Range. Santa Barbara, California, to the Coronado Islands, Lower 
California. 
Venericardia crassidens Broderip and Sowerby, 1829. 
Zool. Journ., 4:365. Proc. U. S. N. M., 26:949; pi. 43, fig. 9. 
A. testa suborbiculari, crassa; obsolete radiatim sulcata; antice bre- 
vissima; umbonibus antice productis; marginibus internis crenatis; cardine 
lato, dente centrali in valva altera maximo. Long., 1 %o i 17 Ao J a L., 
11 %o poll. (Broderip and Sowerby.) 
A single specimen of this fine species was obtained off Icy Cape by 
Lieutenant Belcher. Its epidermis is thick and dark coloured, but is much 
eroded around the umbos. The shell is of a dirty white colour, except 
the center within, where it is tinged with dull reddish purple. The edges 
of the very broad tooth in the hinge of the right valve are irregularly 
sculptured. The internal marginal crenations are very wide, and have 
almost the appearance of low embrasures. (Broderip and Sowerby.) 
Type in Mr. Bland’s collection. Type locality, Arctic Ocean. 
Range. Arctic and Bering Seas and eastward; Kodiak Island, Alaska. 
