114 
MARINE SHELLS OF WEST COAST OF NORTH AMERICA 
Venericardia ventricosa Gould, 1850. 
Proc. Boston Soc. Nat. Hist., 3:276. Rept. U. S. Expl Exp., p. 417; fig. 532. 
Shell small, solid, very slightly oblique; beaks tumid, elevated, nearly 
central, slightly curved, eroded; valves tumid, with about 18 or 20 rounded, 
well-defined radiating ribs, which are crossed by numerous inconspicuous, 
nodular, concentric bars, most distinct about the umbos, covered with 
a rusty-brown, velvety epidermis, the pile set in radiating ranges, especially 
in the intercostal spaces. Hinge of the right valve with a strong, elevated, 
oblique, triangular tooth, defined by deep furrows each side, its apex 
detached from the margin of the shell, acute; marginal crenulations deep, 
well defined. Length, J height, %; diameter, inch. (Gould.) 
Type in Boston Soc. Nat. History? Type locality, Puget Sound. 
Range. Belkoffski Bay, Alaska, to the Coronado Islands and Cortez 
Bank. 
Venericardia crebricostata Krause, 1885. 
Plate 13, fig. 12. 
Arch. f. Naturg., 51:30; pi. 3, fig. 4. 
Die Zahl der Rippen betragt 22-25; der Schlossrand ist dick, die 
Wirbel liegen central und sind nicht zerfressen, in der Nahe der Wirbel 
sind die Rippen durch concentrische Furchen deutlicher und regel- 
massiger crenulirt als bei den vorigen. Die gitterartige Sculptur der 
Rippen ist wie bei der vorigen. Die grossere Schale zeigt folgende 
Masse, als bei der vorigen. Long., 24; alt., 22J4 ; crass; 6 l / 2 mm. (Krause.) 
Type in Stuttgart Royal Cabinet. Type locality, St. Paul Island, 
Alaska. 
Range. Point Barrow, Alaska, to Monterey. 
Venericardia monilicosta Gabb, 1861. 
Proc. Acad. Nat. Sci. Philo., p. 371. 
Shell nearly circular; beaks small, submedian, cardinal border straight 
or faintly arcuate. Surface marked by from fourteen to seventeen large 
rounded ribs, strongly moniliform; interspaces narrow, acute. Posterior 
muscular impression largest. Pallial line broad and distinct but not 
impressed. Internal margin coarsely crenulate, one large square tooth 
corresponding with each interspace between the ribs; extreme edge undu¬ 
lated. Hinge robust. Length, 1.9 in.; width, 2 in.; depth of single valve, 
.05 in. (Gabb.) 
This was described as Cardita monilicosta , and may not be found in 
the recent. 
Type locality, Tertiary of Santa Barbara, California. 
Range. Recent (?) only from type locality. Fossil. Pleistocene. 
