BEEKMANTOWN AND CHAZY FORMATIONS OF CHAMPLAIN BASIN 509 



SYNOPTIC TAXONOMY OF THE CEPHALOPODA OF THE BEEKMANTOWN 

 AND CHAZY STAGES OF THE CHAMPLAIN BASIN 



Order XJ^UTILOIDEA 



Suborder A. HOLOCHOANITES Hyatt 



Division II. ENDOCERATIDA 



Family EisrDOCE:R.A.TiDA.E 



Genus cameroceras (Conrad) emend. Hyatt 



Cameroceras (Proterocameroceras) brainerdi WhMcld (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 marcoui Barrande (sp.) .\ 



Genus nanno Clarke 



Nanno noveboracnm sp. nov. 



Family PiLOCER^^^TiiDAEi 



Genus piloceras Salter 

 Piloceras explanator Whitfield • < 



Family CYRTEMSIDOCER.A.XIDA.Ei 



Genus cyrtendoceras Remele 



Cyrtendoceras (?) priscum sp. nov. 



Suborder D. ORTHOCHOANIXES Hyatt 

 Division I. ORTHOCERATIDA 

 Family orxhocerjvtidjsilE^ 



Genus baltoceras Holm 



Baltoceras (?) pusillum 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 

 Geisonoceras shumardi Billings (sp.) 



