PLATE 69. 



Platyceras cf. mnltisinaatum Hall 

 Page 257. 



Fig. 1. Spiral view of an incomplete specimen. 



Platyceras cf. newberryi Hal! 

 Page 258. 



Fig. 2. Lateral view showing character of the surface markings. 



Platyceras nodosum Conrad 

 Page 258. 



Fig. 3. Lateral view of a small individual showing nodes. 

 Figs. 4, 5. Spiral and lateral views of a mature specimen. 

 Fig. 6. Umbilical view of an incomplete specimen. 



Platyceras reflexion Hall 

 Page 259, 



Figs. 7-9. Spiral views of three specimens showing variation in size. 



Platyceras retrorsum Hall 

 Page 260. 



Fig. 10. Spiral view of a nearly complete specimen. 



Platyceras cj. subconicum Ohern 

 Page 260. 



Fig. 11. Lateral view of an incomplete specimen. 



Platyceras trilobatum Hall 

 Page 260 



Fig. 12. Spiral view of a specimen incomplete in the apical part. 



Platyceras peregrinus sp. now 

 Page 259. 



Figs. 13, 14. Spiral and lateral views of an incomplete specimen, showing the much 

 compressed form. 



Platyceras depressum sp. nov. 

 Page 255. 



Figs. 15, 16. Spiral and lateral views showing the compressed and subangular outline 

 of the shell. 



Hyolithes cf. oxys Clarke 

 Page 261. 



Fig. 17. View of the convex face of an incomplete specimen. 



Tentaculites elongatus Hall 

 Page 262. 



Fig. 18. Lateral view of the internal cast of a specimen. Natural size. 



