Grabau — Faunas of the Hamilton Group. 



303 



105 Spinier mucronatus. r 



110 S. audaculus. r 



116 Ambocoelia umbonata. r 



121 Athyris spiriferoides. C 



Anthozoa : 



152 Streptelasma rectum, c 



j. The middle Trilobite bed. 



The fauna of this bed is much like that of the first, showing a return of 

 the fauna with the return of the physical conditions. 



Crustacea ; 



1 Phacops rana. cc 



2 Cryphams BoothL c 



2a C. Boothi var. calliteles. r 



3 Homalonotus Dekayi. R 



6 Primitiopsis punctulifera. r 

 Other Ostracoda. 



Cephalopoda : 



10 Orthoceras nuntium. r 



Pteropoda : 



15 Styliolina fissurella. r 



Gasteropoda : 



19 Platyceras carinatum. r 



Lamellibranehiata : 



34 Aviculopecten princeps. r 

 47 Modiomorpha subalata. c 

 55 Palaeoneilo tenuistriata. r 

 57 P. muta. r 



Brachiopoda : 



79 Pholidops Hamiltoniae. r 

 82 Rhipidomella Vanuxemi. r 

 87 Orthothetes arctostriata. r 



91 Stropheodonta perplana. r 



92 S. inequistriata. r 



