MARCELLTJS LIMESTONES AND THEIR FAUNAS 133 



Bryozoans 



HJederella canadensis Nicholson 

 H. cirrhosa Hall 

 Keptaria stolonifera Rolle 



Blastoids 

 Nucleocrinus lucina Hall 



Corals 

 Favosite« placenta Hall 

 Stereolasma rectum Hall 

 Striatopora limbata Conrad 

 Komingeria 

 Aulopora 



2 Fauna of lower beds at Lancaster (Miss Wood's i-vi) 



Worms 

 Spirorbis 



Crustaceans 

 Cry] ilia ens boothi Green 

 Pbacops rana Green 

 Cyphaspis craspedota Hall 

 Primitiopsis punctulifera Hall 



Cephalopods 

 Orthoceras exile Hall 

 O. marcellense Yanuxem 

 Bactrites 



Gastropods 



Plartyceras attenuatum Hall 

 Pleurotomaria capillaria var. rustica Hall 

 Onychoehilus nitidulus Clarke (?) 

 Loxonema 



Lamellibranchs 



Pterin ope c ten exfoliatus Hall 

 Actinopteria muricata Hall 

 Cypricardinia indenta Conrad 



