PLATE II. 



Fig. 1. PLATYCERAS VENTRICOSUM, Conrad. Viewed from above. Nat. size. (p. 115.) 

 la. Portion of the surface, enlarged. 



Fig. 2. PLATYCERAS INTERMEDIUM, Hall (1). Nat. sise. (p. 115.) 



Fig. 3. STROPHOSTYLUS (?) SUB-GLOBOSUS, Nich. Nat. size. (p. 118.) 

 3a. Portion of the surface of the same, enlarged. 



Fig. 4. PLATYOSTOMA VENTRICOSA, Conrad. Nat. size. (p. 117.) 



Fig. 5. PLATYCERAS UNISERIALE, Nich. Nat. size. (p. 116.) 



Fig. 6. PLATYCERAS sp. Nat. size. (p. 116.) 



Fig. 7. PLATYCERAS sp. Nat. size. (p. 116.) 



Fig. 8. HELICOTOMA (?) SEROTINA, Nich. Nat. size. (p. 120.) 

 8a. The same viewed from above. 



Fig. 9. HELOPEA ERIENSIS, Nich. Nat. size. (p. 120.) 



Fig. 10. STROPHOSTYLUS (?) OVATUS, Nich. Nat. size. (p. 118.) 

 10a. Portion of the surface of the same, enlarged. 



Fig. 11. STROPHOSTYLUS (?) OBLIQUUS, Nich. Dorsal aspect, nat. size, (p. 119.) 

 lla. Front view of the same, nat. size. 



