s 
APJ’KN ! >IX. 
a minute impressed line; margins rounded; disk with a few concentric 
furrows and strong lines of growth; anterior lateral tooth narrow, elon 
gated, parallel with the hinge margin above it, and rough with tuberculi- 
1'orm stria*. 
A common species, the largest of which found entire measures three 
and a half inches in length. Others much larger could only be obtained 
in fragments. 
C Y CLOT II Y R I S. Conrad. 
Shell rounded, inequilateral ; hinge with four cardinal teeth in the right 
valve, three of which are united above; hinge of left valve with three 
widely diverging cardinal teeth, posterior tooth linear, very oblique and 
with a broad, flattened, triangular pit between it and the middle tooth ; 
fulcrum long, broad, obtuse ; pallial sinus profoundly angular, ascending, 
lunule undefined. 
C. Carolinensis , pi. 2, fig. 3. Shell rounded, ventricose ; length 
slightly exceeding the height; dorsal margin posteriorly very oblique, 
slightly curved ; end margin subtru nested ; disk with concentric unequal 
lines obsolete on the middle of the disk. 
A very common shell, often found entire with united valves. 
C. alta , pi. 2, fig. 4. Shell short ovate from ventral margin to beak, 
equilateral; margins regulary rounded: disk'* polished, lines of growth 
distinct. 
TENEA. Conrad. 
T. par'd is, pi. 2, fig. 25. American Journal of Conch, vol. 6, p. 74, 
pi. 3, fig. 12. 
Dosinia. Conrad. Journ. Acad. Nat. Sciences, vol, 4, 2d series, 
pi. 40, tig. 16. 
BARODA. Stol/lcrsl'a. 
■ *r 
i c 
J>. Carol mentis, pi. 2,1%. 10.' Shell oblong, very inequilateral. convex, 
with a few slightly impressed concentric furrows; posterior cardinal 
margin long straight, oblique; margins rounded; umbonal slope unde- 
fined and regularly convex with post-umbonal slope. 
This is the first species found in America and represents an interesting 
exclusively Cretaceous genus. The hinge fortunately can be obtained in 
