PLATE 37 



Gomphoceras cf. impar Hall 

 Page 159. 



Fig. 1. The best preserved specimen. (X 3/5). 



(Grand Tower limestone.) (W. M. 23895.) 



Gomphoceras missoiiriensis Branson and Williams 

 Page 160. 



Figs. 2 and 3. Side views of two living chambers. 

 Fig. 4. Dorsal view of a living chamber. 

 Fig. 5. Outline of aperture. 



(Grand Tower limestone.) (W. M. 23900.) 



Gomphoceras grandtowerensis Branson and Williams 

 Page 153. 



Figs. 6 and 7. Two views of the holotype. (X3^). 



(Grand Tower limestone.) (W. M. 23897.) 



Nephriticeras sp. undet. 

 Page 158. 

 Fig. 8. Side view of a fragment. 



(Grand Tower limestone.) (W. M. 23902.) 

 Fig. 9. Unidentified specimen. 



(Grand Tower limestone.) (W. M. 23903.) 



Orthoceras cf. subulatum Hall 

 Page 157. 



Fig. 10. The largest specimen collected. The air chambers are better preserved in 

 other specimens. 



(Grand Tower limestone.) (W. M. 23898.) 



