THE HAMILTON ASSOCIATION. 25 



Strophomera Alternata Conrad 



Strophomera Deltoidea " 



Modiolopses Modeolares , " 



Avicula Demissa " 



Cyrtolites Ornatus " 



Orthis Occidentalis Hall 



Obolella Crassa , 



Ambonychia Radiata 



Murchesonia Gracilis 



Orthoceras Lamellosa 



Orthoceras Cribisepta 



Leptaena Serecia Sowerby 



Orthis testudinaria Dolman 



Orthis Lynx Echwold 



Cyrtodonta Narrietta Billings 



Modiolopsis — several 



Orthonota 



Ctenodonta , 



Syrodesma post-striata Emmons 



Leperditua Canadensis , Jones 



CAMBRO SIL. DRIFT FOSSILS FROM HAMILTON AND LAKE 

 SHORE, WINONA. 



Diplograptus Hudsonicus Nicholson 



Pristis Hall 



Graptolite undetermined yet. 



Orthodesma Contracta Hall 



Curvata " 



Recta " 



Parallela " 



Orbiculoidea Tenni lamellosa 



Obolus filosus Hall 



Murchesonia (not M. Gracilis) Bellicinata Hall 



Bellerophon Bilobata Sowerby 



" Expansa Hall 



Crania — undetermined yet — 2 species. 



" Scabiosa Hall 



Discina — 1 or 2 species ■ 



