220 CONTRIBUTIONS TO GEOLOGY. 
edges, with about six angular striz, which indicate the 
interior chambers ; mouth terminal, oval, sublabiate. 
Diam, 1-20th, 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 strize become obsolete at the base, being most 
distinct on the superior part. 
