PLATE 26 



Conocardium ohioense Meek 

 Page 112. 



Figs. 1 and 2. Two views of a ventricose specimen. (X2.) 



Figs. 3 and 4. Two views of a specimen with the posterior end missing. (X2.) 



Figs. 5-7. A large ventricose specimen with both ends missing. 



(Mineola limestone of Ralls and Montgomery Counties. X2.) 



Platyceras cf. erectum Hall 

 Page 122. 



Fig. 8. Side view of a small specimen. (X2.) 



(Mineola limestone of Montgomery County.) 



Platyceras carinatum Hall 

 Page 121. 



Figs. 10-11. Two views of an average specimen. 



(Mineola limestone of Montgomery County.) 



Platyceras cf. calantica Hall 

 Page 120. 



Figs. 9 and 17. Side and top views of an average specimen. 

 (Mineola limestone of Montgomery County.) 



Platyceras annulatum Branson 

 Page 122. 



Figs. 12 and 13. Side and top views of the holotype. 



(Mineola limestone of Montgomery County.) 



Euryzone lucina (Hall) 

 Page 119. 



Fig. 14. Side view of a nearly perfect specimen so incrusted as to conceal a slit band if 

 one is present. (Mineola limestone of Ralls County.) 



Platyceras conicum Hall 

 Page 121. 



Figs. 15 and 16. Side and top views of an imperfect specimen. 

 (Mineola limestone of Montgomery County.) 



Euryzone mineolaensis Branson 

 Page 118. 



Fig. 18. A portion of a shell showing the slit band. 

 (Mineola limestone of Ralls County.) 



Pleurotomaria providencis Broadhead 

 Page 118. 



Fig. 19. Part of the shell showing ornamentation and slit band. 



Fig. 20. A composite drawing. The shells in the collection of the University of Mis- 

 souri are all imperfect or covered with hard rock. Broadhead's cotypes are 

 in the collection. 



(Cooper limestone of Providence, Missouri.) 



