158 



Cincinnati Society of Natural History. 



This species, when compared with Beyrichia ciliata, is pro- 

 portionally wider ; has a wide border, while that species has 

 only a linear border ; has deeper sulci and a more convex 

 ridge between them. Judging from some recent publications 

 on the Ostracoda, there are those who would affix a new 

 generic name to this species, but what light that would shed 

 upon its characters, or how it would advance knowledge or 

 assist in classification, we are unable to understand. We 

 think it is a true Beyrichia. 



Found in the upper part of the Hudson River Group, by 

 one of the authors, at Versailles, Indiana, associated with 

 Cyclora pidcella, Palcsoconcha faberi, Hyolithes versaillesensis, 

 and other small fossils. 



The specific name is in honor of Mr. J. F. Hammell, the 

 well-known geologist of Madison, Indiana. 



