200 
Retufum, 
Hemicar- 
dium. 
Lithocar- 
dium. 
Lineatum. 
• Medium. 
WORMS. TESTACEA. 59. Cardium. 
Argeti--v,Cunch. tab. 23, D. Chemn. cone. tab. 147,' 
Inhabits Nicobar IJlands : refembles C. cardifla. j 
Shell varied with white and rofe-colour, with a heart-ft*P 
gape before the beaks. 
Shell heart-fhaped; the valves ftrlate crenulafe fubcarin^^^ 
behind the beaks a lunate heart-lhaped gape. 
Born Muf. Ctes. Find. test. tab. 'i.fig.'t, 2. 
Chemn. cone. 6, tab. 14. _/f^. 139 — 142. ^ 
Inhabits India, Arabia and Egypt ; a middle fpecies between 
hemicardiuin and C. fragunj: about 2 inches long and 
as much broad ; thick, milk-vvhite, anteriorly concave. 
vex behind, appearing as if truncate: the margin with pl“‘‘^ 
teeth. 
Shell heart-lliaped, fubquadriteral,- with Carinate valv^®' 
beaks diftant.- 
Barbut. tab, 0,. fig. 9, RuntpJ.Muf. tab. 44. H. 
Peti-v. Amb tab. 17. f.\. Gualt. test. tab. 83. Cr 
Knorr. Nergn. 6. tab. I,. fig. 3. 
Chemn. cone. 6. tab. ih'fig, 1 59, 160. 
Inhabits the Indian Ocean ; refemblcs C cardiiTa, 
Shell outlidc ochraceous, within fnowy ; a few of the 
brous, the reft nodulous with the intermediate grooves 
and marked with excavated dots. 
Shell heart-fliaped, fubtriiateral, the valves tranfvcrr^l' 
grooved, the forepart longitudinally ftriafe. 
Found hitherto in a foffile ftate only : refembles the laft : 
carinate on the fore-part, the ridges crenulatC; beaks appt®’^; 
imate, with an ovate gape beneath them, the upper-pat*- ^ 
which is ftattilh lengitudinally crenuiate ftriate with a 
ridge. 
Shell hcai t-(haped, carinate, the fore-paft obliquely tru**' 
cate, thin, quite fmooth, fnowy with gilt ftriae: 
gin denticulate. 
Kamm, lab. Rudolst.p 210, tab, 12. fig, 4, 
Inhabits £6r// above an inch long. 
Shell fomething heart-fliaped, fubangular; the valveS'' 3 ^' 
gular grooved fmooth. 
Dontrvans Brit. Shells, i. tab. 32. fig. li 
Lister. Cenih. tab. 316. Gualt, test. tab. 83,8, 
Bonan. recr. 2. fig. 94. Muf. ktich, 2. fig, 91 . 
Knorr Vtrgn. I. tab. 29. fig. 5,6, t. 20,/. J. 
Spengler Conch, tab, 1 .fig, k. 
