222 



Palaeozoic Fossils of the Northwest — Bierhauer. 



*"I have at least 25 new species of Ostracoda from the Trenton and Galena of 

 Minnesota, belonging to the genera: Aparchites, Bythocypris, Eurychilina, Cteno- 

 balbina (Ulrich, M. S ). Ceraditia (Ulrich, M. 8.), Jonesella (Ulrich, M. S.), Premitia and 

 Leperditia."— £?. O. Ulrich. 



tWhitfield, no doubt had Peronopora decip'ens Rominger in view, but W. is in error; 

 the species does not occur in Wis. 



jDo not occur in Wisconsin.— C//ricZi. 



