198 Bulletin 29 362 



Genus Venericardia Lamarck 

 Venericardia scabricostata Guppy 

 Plate 33, Figure i 



Cardita scabricostata Guppy, Quart. Jour. Geol. Soc. London, vol. 22, 



p. 293, pi. 18, fig. 10, 1866, 

 Cardita scabricostata Gabb, Trans. Amer. Phil. Soc, vol. 15, p. 252, 



i873- 

 Cardita scabricostata Guppy, Quart. Jour. Geol. Soc, vol. 32, p. 531, 



1876. 

 Venericardia scabricostata Dall, Trans. Wagner Inst. Sci., vol. 3, pt. 6, 



pp. 1428, 1586, 1903. 



Shell suborbicular with about eighteen prominent, high ribs, 

 nodulosely crenulated; interspaces V-shaped, narrower than the 

 ribs; beaks high; umbones inflated. Length 21, altitude 20, di- 

 ameter 17 mm. 



Guppy' s figure of the Jamaican type is inadequate but his 

 description agrees with our Dominican shells. 



Localities. — (Exp'd '16) Bluff 2, Cercado de Mao; Zone G, 

 Rio Gurabo at Los Quemados; Zone I, Rio Cana at Caimito. 

 (Common). 



Ven ericardia islahispan iolce 

 Plate 33, Figure 2 



Shell sub-quadrate, beaks very far forward, dorsal and basal 

 margins nearly parallel, posterior margin truncate; ribs twenty- 

 four, narrow, more or less smooth on the umbonal ridge, else- 

 where minutely but sharply nodulated on their crests; interspaces 

 shallow, wider than the ribs, marked with irregular wavy growth 

 lines. Length 23, altitude 21, diameter 18 mm. 



This species is readily distinguished from scabricostata by its 

 quadrate form, numerous, narrow ribs with interspaces wider and 

 shallower. 



Localities. — (Exp'd '16) Zones A, B, E, Rio Gurabo at 

 Los Quemados. 



