48 CRETACEOUS GROUP 



From the calcareous strata of Gloucester, New Jersey. 



RbSTELLARIA. 



1. R. arenarum, (S. G. M.) PL v, fig. 8. 



Specific character. Whorls four or five, with elevated, lon- 

 gitudinal costse, and broad, concave, intervening spaces. 



Length, about an inch and a half. 



A variable species, casts of which are common through- 

 out the blue marls. 



2. R. pennata, (S. G. M.) PL xix. fig. 9. 



Specific character. Shell elevated, with about six convex 

 volutions, and with obscure, oblique, longitudinal costae or 

 undulations ; body whorl ventricose ; labrum expanded, sinu- 

 ous. 



From Prairie Bluff, Alabama. 



3. I have some casts of a smaller and very distinct 

 species from Delaware. 



TORNITELLA. 



1. T.? bullata, (S. G. M.) PL v. fig. 3. 



Specific character. Ovoidal, ventricose, with numerous trans- 

 verse striae. 

 Length, about one inch. 

 From the marl of New Jersey. 



2. Casts of a smooth species, much smaller than the 

 preceding, occur with it. 



Natica. 

 1. N. pelrosa, (S. G. M.) PL xix. fig. 6. 



