BEEKMANTOWN AND CHAZY FORMATIONS OF CHAMPLAIN BASIN 509 



SYNOPTIC TAXONOMY OF THE CEPHALOPODA OF THE BEEKMANTOWN 

 AND CHAZY STAGES OF THE CHAMPLAIN BASIN 



Order NAUTILOIDEA 



Suborder A. HOLOCHOANITES Hyatt 



Division II. ENDOCERATIDA 



Family endoceratidae 



Genus cameroceras (Conrad) emend. Hyatt 

 Cameroceras ( Proterocameroceras) brainerdi Whitfield (sp.) 

 C. tenuiseptum Hall (sp.) 

 C. curvatum sp. nov. 



Genus vaginoceras Hyatt 

 Vaginoceras oppletum sp. nov. 



Genus endoceras (Hall) Hyatt emend. 

 Endoceras (?) champlainense sp. nov. 

 E. (?) hudsoni sp. nov. 

 E. magister sp. nov. 

 E. montrealense Billings (sp.) 



Genus suecoceras Holm 



Suecoceras marconi Barrande (sp.) 



Genus nanno Clarke 

 Nanno noveboracum sp. nov. 



Family piloceratidae 

 Genus piloceras Salter 

 Piloceras explanator Whitfield 



Family CYKTExnoci^KATiDAE 

 Genus cyrtendoceras Remele 

 Cyrtendoceras (?) priscum sp. nov. 



Suborder D. ORTHOCHOANITES Hyatt 

 Division I. ORTHOCERATIDA 

 Family orthoceratidae 



Genus baltoceras Holm 

 Baltoceras (?) pusilhim sp. nov. 



Genus orthoceras (Breyn.) Hyatt emend 

 Orthoceras lentum sp. nov. 

 O. progressum sp. nov. 

 O. vagum sp. nov. 

 O. modestum sp. nov. 



Genus geisonoceras Hyatt 

 Gcisonoceras shumardi Billings (sp.) 



