CONTRIBUTIONS TO GEOLOGY. 



edges, with about six angular striae, which indicate the 

 interior chambers ; mouth terminal, oval, sublabiate. 



Diam. l-20th, Length .2, Breadth .1, of an inch. 



Observations. The two specimens differ somewhat in 

 outline, the larger one being more elliptical. In both, 

 the angular striss become obsolete at the base, being most 

 distinct on the superior part. 



