72 CRETACEOUS GROUP 



4. T. lachryma, (S. G. M.) PL x, fig. 11, and pi. 

 xvi, fig. 6. 



Specific character, Ovato-triangular ; beak elongated, fora- 

 men large ; valves convex, marked by delicate longitudinal 

 striae. 



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. ^. 7. 



Specific character. Suborbicular, with a slight biplication, 

 and obscure longitudinal striae ; 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.) PL x, fi^. 5. 



The valves of this species have distinct longitudinal 

 strisB, 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. 



