NAPLES FAUNA IN WESTERN NEW YORK, PART 2 417 



Genus actinopteria Hall 



Page 263 



Actinopteria sola sp. nov. 



Page 263 



20 A left valve, xio 



Cashaqua shales Cashaqua creek 



Genus eeasmatium gen. nov. 



Page 293 



Elasmatium gowandense sp. nov. 



Page 294 



21-27 A series of left valves showing the bending of the shell along 

 the principal clavicular ridge. Indications of the secondary 

 or posterior internal ridge are shown in figures 23, 24, 27 



28 A left valve. X2 



29 A large left valve 



Chautauqua subprovince Gowanda and Forestville 



Genus leptodomus McCoy 



Page 315 



Leptodomus multiplex sp. nov. 



Page 315 



30 A right valve showing the surface characters 



Naples subprovince Rhinestreet black shale, Naples 



Genus modiedi^a Hall 



Page 316 



Modiella sp. ? 



Page 316 



31 Internal cast of a right valve. X2 



Naples subprovince Naples 



Leptodomus interplicatus sp. nov. 



• Page 315 



32-34 Three views of the shell variously compressed and showing 

 the characteristic surface features 

 Naples subprovince In the Hatch shales, Naples 



