56 



BIRD'S EYE AND BLACK RIVEK FORMATIOK 



Protozoa. 



Receptaculites occidentalis, Salter. 

 Stromatocerium rugosum, Hall. 



Polypi. 



Columnaria Halli, Nicholson. 

 Streptelasma profundus, Hall. 

 Tetradium fibratum, SafFord. 



Brachiopoda. 



Rhyiichonella iucrebescens, Hall, 

 Streptorhynchus filitextus, Hall. 



Lamellibranchiata. 



Cyrtodonta subtruncata, Hall. 

 Gastropoda. 



Pleurotoraaria subconica, Hall. "^ 



Cephalopoda. 



Cyrtoceras falx, Billings. 



" siniiatum, Billings.. 



" vagans, Billings. 



Gonioceras anceps, Hall. 

 Oncoceras constrictum, Hall. 

 Orthoceras (Ornioceras) Bigsbyi, Stokes. 

 " bilineatura, Hall. 



" decrescens, Billings. 



" rapax, Billings. 



Crustacea. 



Illpenus Conradi, Billings. 

 " ovatus, Billings. 



" Trentonensis, Emmons. 



Leperditia gracilis'? Jones. 



TRENTON FORMATION. 

 Plants? 



Bntliotrephis gracilis, Hall. 

 PalKOphycus obscurus, Billings. 

 Licrophycus minor, Billings. 



" Ottawaensis, Billings. 



" succulens, Hall. 



Protozoa. 



Astylospongia parvula, Billings. 

 Pasceolus globosus, Billings. 

 Receptaculites lowensis, Billings. 

 " occidentalis, Salter. 



