MUSEUM OF COMPARATIVE ZOOLOGY. 269 
Chama sarda ReErve. 
One specimen from 38 fms., at Station 127, near Santa Cruz, living. 
Famity CARDIIDZ. 
Gents CARDIUM Luinné. 
Cardium ceramidum, n. s. 
Cardium sp. indet. Dall, Bull. M. C. Z., IX. p. 182, 1881. 
Plate IV. 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; lon. 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 Linynz. 
Cardium medium Linné, Dall, Bull. 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 Datt. 
Cardium (Fulvia) peramabilis Dall, Bull. M. C, Z., IX. p. 132, 1881. 
Plate IV. Fig. 7. 
Habitat. Sigshee, Station 50, 119 fms.; U.S. 8S. Bache, April 22, 1872, 
100 fms.; Barbados 76-100 fms.; Station 9, 111 fms.; Station 177, 18 fms., off 
* Quarterly Journal Geol. Society, Vol. VI. p. 52, pl. x. figs. 11 a, 11 b, 1849. 
