MUSEUM OF COMPARATIVE ZOOLOGY. 269 



Chama sarda Reeve. 

 One specimen from 38 fms., at Station 127, near Santa Cruz, living. 



Family CARDIID^. 



Genus CARDIUM Linn^. 



Cardium ceramidum, n. s. 



Cardlum sp. indet. Ball, BuU. M. C. Z., IX. p. 132, 1881. 



Plate rv. Fig. 6. 



Shell related to and doubtless the descendant of Cardium haitense Sowerby,* 

 from the Miocene of Jamaica and Santa Domingo, but much smaller ; with 

 eighteen ribs instead of twenty-four; the four middle ribs much larger in 

 proportion to the others ; the granules on the ribs smaller; the anterior 

 slope fuller and rounder; the posterior more oblique and less elevated; the 

 shell not so high in proportion to its length; the hinge-margin narrower; 

 the teeth more delicate, and the beaks not so elevated. Alt. of largest valve 

 8.2; Ion. do. 8.2; double diameter of same 8.0 mm. 



Habitat. Off Havana, Sigsbee, in 182 fms. ; Samana Bay, Dominica, Cou- 

 thouy; St. Thomas, living near the shore, U. S. Fish Commission steamer 

 " Albatross," in 1884. 



This lovely little shell is yellowish; the foot is extremely long and sub- 

 cylindrical with a very narrow serrated margin behind ; the palpi are large and 

 lamellate, the gills broad, the mantle near the orifices at the posterior end, 

 furnished with a multitude of long stout tentacular processes. 



Cardium medium Linne. 



Cardium medium Linne', Dall, BuU. M. C. Z., IX. p. 132, 1881. 



Habitat. Sigsbee, off Havana, 80 fms.; Barbados, valves in 100 fms. 

 This common West Indian shell probably inhabits shallow water, and the 

 valves dredged as above were drifted or disgorged by fishes. 



Cardium (Fulvia) peramabilis Ball. 



Cardium (Fulvia) peramabilis Dall, BuU. M. C. Z., IX. p. 132, 1881. 



Plate IV. Fig. 7. 



Habitat. Sigsbee, Station 50, 119 fms.; U. S. S. Bache, April 22, 1872, 

 100 fms.; Barbados 76-100 fms.; Station 9, 111 fms.; Station 177, 18 fms., oflF 



* Quarterly Journal Geol. Society, Vol. VI. p. 52, pi. x. figs. 11 a, 11 b, 1849. 



