NICKI.ES ANU BASSLKR. 



GEOLOGIC DISTRIBUTION. 



87 



Lists of species — Continued. 

 SILURIAN— Continued. 



Fenestella elegaii.s Hall 



? f requeiis Hall 



hestia Hall 



? idalia Hall 



juncea Hall 



noe Hall and Simpson 



parvulipora Hall 



pertenuis Hall 



philia Hall 



prolixa Hall 



spio Hall and Simpson 



Sylvia Hall 



tenuis Hall 



Fistulipora ? crassa ( Hall ) 



distans (Hall ) 



halli Rominger 



hemispherica (Roemer) 



maculosa (Hall ) 



neglecta Roniinger 



neglecta-maeulata Hall 



serialis (Hall and Simpson) 



torta (Hall) 



? triloba Hall and Simpson 



Helicopora latispiralis Claypole 



Helopora armata Billings 



bellula Billings 



? ? circe Billings 



? ? concava Billings 



fragilis Hall 



? ? irregularis Billings 



nodosa Billings 



? ? varipora Billings 



Hemitrypa biserialis (Hall) 



biserialis-exilis (Hall and Simpson) 



ulrichi Foerste 



Homotrypa ? confluens Foerste 



?solida (Hall) 



Ichthyorachis nereis Hall 



Idiotrypa parasitica Ulrich 



Leptotrypa ? sphserion (Hall) 



Aiitit'Dsti 



X 

 X 

 X 

 X 



X 

 X 

 X 



Clinton. 



X 



X 



X 

 X 



Niagara. 



X 



X 

 X 



X 



X 

 X 



X 

 X 



X 



X 



X 



X 

 X 



Lower 

 Ht'lfl. 



X 

 X 

 X 

 X 

 X 



X 



X 

 X 



X 

 X 



X 



X 

 X 

 X 



X 

 X 



X 



