PLATE 36 



All figures natural size 

 Figs. I, 2, 10. Ptyctodus calceolus Newb. and Worthen. 

 I, 2, E 1913,?- 109. 

 10, E 2431, p. 109. 

 Figs. 3-9; 11,12. Ftyctodus compressHS ILsLstmRn. 



3, E 1914, p. no. 



4, E 2410, p. III. 



5, E 1916, p. no. 



6, E 1917, p. no. 



7, E 2432, p. 115. 



8, E 1914, p. no. 



9, E 1912, p. no. 

 n,E 2433, p, ni. 

 12, E 1914, p. no. 



270 



