PTEROPOBA 



207 



In 1876 C. D. Walcott described Conularia quadrata, from the Trenton group 

 (Desc. New Species of Fossils, in advance of the Report of N. Y. State Museum of Nat. 

 History). 



In 1876 J. Hall designated and illustrated Conularia Cayuga, C. continens, and 

 C. crebristriata, from the Hamilton group, and C. congregata, from the Portage 

 group (Illustrations of Devonian Fossils, descriptions of plates 28 and 29). 



The geological distribution of these species is presented in the following table: 



