72 CRETACEOUS GROUP 
4. T. lachryma, (S.G.M.) PI. x, fig. 11, and pl. 
Xvi, fig. 6. 
Specific character. Ovato-triangular; beak elongated, fora- 
men large; valves convex, marked by delicate longitudinal 
stric. ; 
Length, half an inch; breadth, one-fourth of an inch. 
This beautiful species is abundant in the calcareous 
strata of South Carolina, whence I received it through 
Mr. Conrad. This gentleman has more recently obtained 
it from the same strata below Claiborne, Alabama. 
5. T. floridana, (S. G. M.) Pl. xvi. fig. 7. 
Specific character. Suborbicular, with a slight biplication, 
and obscure longitudinal strize; beak produced, not incurved; 
foramen small; both valves nearly equally convex. 
Diameter, about half an inch. 
From the older cretaceous strata at Prairie Bluff, Ala- 
bama, whence I received it through Mr. Conrad. 
CIRRHOPODA. 
BALANUS. 
1. B. peregrinus, (S.G. M.) PI. x, fig. 5. 
The valves of this species have distinct longitudinal 
striz, crossed by obscure lines.. The shell, in all the spe- 
cimens I have seen, is of a reddish color, and remarkably 
perfect. It varies in diameter from half an inch to one 
inch and a half. 
Found by Mr. Conrad in the calcareous strata of South 
Carolina. 

