NICKLES ANC BASSLER.] 



GEOLOGIC DISTRIBUTION. 



77 



Lists of species — Continued. 

 TRENTON— Continued. 



Leptotrypa ? acervulosa Ulrich 



? claviformis Ulrich . . . 

 ? hexagonalis Ulrich . . 



informia Ulrich 



Mesotryi>a discoidea Ulrich 



infida ( Ulrich ) 



quebecensis (Ami) 



regularis ( Foord ) , 



? rotunda Ulrich 



selkirkensis Whiteaves . 



? spinosa Ulrich 



whiteavesi (Nicholson) . 



Mitoclema cinctosum Ulrich 



? mundulum Ulrich 



Monotrypa cumulata Ulrich 



intabulat^ Ulrich 



magna Ulrich 



rectimuralis Ulrich 



undulata (Nicholson) .. 



Monticulipora arborea Ulrich 



billingsi Foord 



? cannonensis Ulrich . 



incompta Ulrich 



westoni Foord 



wetherbyi Ulrich 



Nematopora alternata Ulrich 



conferta Ulrich 



delicatula Ulrich 



f ragilis Ulrich 



granosa Ulrich 



ovalia Ulrich 



retro rsa Ulrich 



Nicholsonella laminata Ulrich 



ponderosa Ulrich 



pulchra Ulrich 



Pachydictya acuta (Hall) 



elegans Ulrich 



everetti Ulrich 



fimbriata Ulrich 



stones 

 River. 



X 

 X 



Black 

 Kiver. 



X 



X 



X 



X 



X 



X 



X 

 X 



X 



X 

 X 



X 



Trenton. 



X 



X 



X 

 X 

 X 

 X 



X 



X 

 X 

 X 



X 

 X 

 X 

 X 

 X 



X 



X 

 X 

 X 

 X 

 X 

 X 

 X 



X 

 X 



X 



