Grabau — Faunas of the Hamilton Group. 



307 



79 

 82 

 87 

 91 



Pholidops Hamiltoniai, rc 

 Rhipidomella A'anuxemi r 

 Orthothetes arctostriata. rc 

 Stropheodonta perpiana. rc 



99 Chonetes scitula. rc 



100 C. lepida. rc 



103 Productella spinulicosta. rc 



105 Spirifer mucronatus. c 



118 Ambocoelia spinosa. rc 



131 Lioihynchus inulticostus. c 



Anthozoa : 



152 Streptelasnia rectum, r 



After this Chonetes lepida becomes very abundant, forming a characteristic 

 constituent of the fauna. The following is the list of fossils occurring 

 throughout the remainder of these shales. 



q. Twelve feet of fissile shale. 

 Crustacea : 



1 Phacops rana. c 



2 Cryphaeus Boothi. c 



6 Primitiopsis punctulifera. rc 



Cephalopoda ; 



12 Orthoceras exile. (?) R 

 Pteropoda : 



13 Tentaculites bellulus. r 

 15 Styliolina fissurella. c 



Lamellibranchiata : (Most of these occur about ten feet below the Encrinal 



54 



34 



40 



47 



50 



35 



36 



limestone.) 

 Aviculopecten princeps. r 

 A. exacutus. r 

 Pterinopecten conspectus, r 

 Pterinea flabella. r 

 Modiomorpha subalata. r 

 Cypricardella bellistriata. r 

 Palseoneilo constricta. R 



