PLATE 31 



Ptyctodus calceolus (Newberry and Worthen) 

 Page 126. 



Figs. 1 and 2. Top and side views of a large specimen. (X 8/7). 

 (Mineola limestone of Ralls County.) 



Glyptaspis 

 Page 128. 



Fig. 3. Glyptaspis plate (X 1/2). (Snyder Creek shale of Callaway County.) 



Dinichthyids 

 Page 129. 



Figs. 4 and 5. Outer view of a postero-supero-gnathal of a dinichthyid. (Mineola of 



Ralls County.) 

 Fig. 6. Fragment of a dinichthyid bone. (Mineola of Ralla County.) 



Dinichthys pustulosus Eastman 

 Page 127. 



Fig. 7. Median occipital, showing pustules. 

 Fig. 8. Rostral. The reference to D. pustulosus is uncertain. 

 (Mineola limestone of Ralls County.) 



