NICKLES .VND BASSLKR. 



GEOLOGIC DISTRIBUTION. 



91 



Li.sls of specie^ — Contirmed. 

 SILURIAN— C^on ti nued. 



DEVONIAN. 



Acanthoclema alternatuni ( Hall ) 



divergens Hall and Simpson 



ovatum Hall and Simpson 



sulcatum Hall and Simpson 



triseriale ( Hall) 



Acrogenia prolifera Hall 



Ascodictyon fusiforme Nicholson and Etheridge, Jun. 

 stellatum Nicholson and Etheridge, Jun . 



Bactropora curvata Hall and Simpson 



granistriata ( Hall) 



Botryllopora.socialis Nicholson 



Buskopora bistriata ( Hall ) 



dentata Ulrich 



lunata ( Rominger) 



pyriformiH ( Hall ) 



Callotrypa ? geniculata (Hall ) 



internodata ( Hall ) 



multiseriata ( Hall ) 



Ceramella scidacea Hall and Simpson 



Ceramopora ?? imbricella Hall 



Chatetes ?? hamiltonensis Winchell 



?? microscopicus Winchell 



Oriskany 



Upper 

 Held. 



X 

 X 

 X 



X 



X 



X 



X 



Hamilton. 



X 



X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 



X 



X 



X 

 X 

 X 

 X 



