Retufüm, 
Henicar- 
dis. 
Litbocar- 
d, 
Léssatum, 
WORMS. TESTACEA. 59: Cardium. 
Argenv. Conch, tab. 23, D. Chemn. cone. tab. 14, figs 147. 
Inhabits Nicobar fand: : rciembles C. cardiffa. 
Sheil varied with white and rcfe- colour, with a heart-fhaped 
gape before the beaks. 
Shell heart-fhaped ; the valves ftriate crenulate fubcarinate : 
behind the beaksa lunate heart-[haped gape. 
Bern Muf. Ces. Vind. test. tab. 3. fig. 1, 24 
Chemn. cone. 6, tab. 14. fig; 139—147. - 
Inhabits TRAN Arabia and EgyH i a iniddle pete between C; 
hemicardium and C. fraguin: about z inches long and nearly 
as much broad ; thick, milk-white, anteriorly concave, con- 
vex behind, appearing as if truncate: the margin with plaited 
teeth. 
Shel! heart-fhaped, fubquadritéral, with carinate valves: 
beaks diítant. 
Barbut, tab, 3. fig. 9. Rumpf. Muf. tab. 44. Hes 
Petiv. Amb. tab. 17. f. 4. Gualt. test. tab. 83. C, 
Knorr. Vergn. ©. tab. 3. fig. 5. 
Chemn. tone. 6: fab. 16: fig, 159, 160. 
Inhabits the ZzZiaz Ocean; refemoles C cardiff. 
Shell outfide ochraceous, within fnowy : a few of the ribs gla- 
brous, the reft nodulous with the intermediate grooves wrinkled 
and marked with excavated dots. 
Shell heart-fhaped, fubtrilateral, the valves tranfverfely 
grooved, the fore- -part longitudinally ftriate. 
Found hitherto in a foZile ftate only: refembles the laf: valves 
carinate on the fore-part, the ridges crenulate: beaks approx-, 
imate, with an ovate gapé beneath them, the upper-part of 
which is flattifh longitudinally crenulate ftriate with a higher 
ridge. 
Shell heait-fhaped, carinate, the forc-part obliquely trun- 
cate, thin, quite fmooth, fnowy with gilt ftriz: mar- 
gin denticulate. 
Kemm., lab. Rudolst.p. 210. tab, 12. fig. 4, ^ 
Inhabits Shell above an inch long. 
© ifedium, Shell fomething heart-fhaped, fubangular; the valves an- 
ular grooved fmooth. 
Donovan's Brit. Shells. i. tab. 32. fig. 1? 
Lister. Conch. tab. 316. Gualt, test. tab. 834 B. 
Bonan. recr. 2. fig. 94. Muf. ksich. 2. fig. 91. 
Knorr Vergn. Y. tab. 29. fig. 5, 0. t+ 20. ]. 5. 
Spéngler Concb. tab. 1. fig. k. Pa 
emn 
