FOSSILS OF THE CINCINNATI GROUP. 21 



Endoceras proteiforme, var. lineolatum, Hall. 

 Endoceras subcentrale, Hall. 

 Gomphoceras acceptum, Ulrich.§ 

 Gomphoceras eos, Hall & Whitfield. 

 t^ Ormoceras tenuifilum, Hall. 

 y^ Orthoceras amplicameratum, Hall. 

 Orthoceras annellum, Conrad. 

 Orthoceras byrnesi, S. A. Miller. 

 *Orthoceras carleyi, Hall & Whitfield. 

 Orthoceras cincinnatiensis, S. A. Miller. 

 Orthoceras duryi, S. A. Miller. 

 •^ *Orthoceras duseri, Hall and Whitfield. 

 Orthoceras dyeri, S. A. Miller. 

 *Orthoceras fosteri, S. A. Miller. 

 *Orthoceras halli, S. A. Miller. 

 *^ Orthoceras harperi, S. A. Miller. 

 *^ *Orthoceras hindei, James. 

 ^»/*Orthoceras junceum, Hall. 



Orthoceras meeki, S. A. Miller. 

 Orthoceras mohri, S. A. Miller. 

 Orthoceras ortoni, Meek. 

 v^ tOrthoceras transversura, S. A. Miller. 



Orthoceras ttirbidum, Hall and Wnitfield. 

 Phragmoceras hector ( ?) Billings. 

 Trochoceras baeri, Meek and Worthen. 

 Trocholites ammonias, Conrad. 

 Trocholites circularis, Miller and Dyer. 

 Trocholites minusculus, Miller and Dyer. 



Class LAMELLIBRANCHIATA. 



Ambonychia bellastriata, Hall. 

 Ambonychia casei, Meek and Worthen. 

 Ambonychia costata, James. 

 i/ Ambonychia obtiisa, Hall. 

 \J *Ambonychia radiata, Hall. 



Ambonychia retrorsa, S. A. Miller. 

 Ambonychia robusta, S. A. Miller. 



