PLATE 34 



Figs. I, 3. Ptyctodiis calceolus Newb. and Worthen. Right lower dental plate; 

 natural size, i, oral view, showing entire tri tor; 3, inner view. E1884, p. 108. 



Fig. 2. Microsection of Ptydodus calceolus, cut parallel to the side wall of the 

 tritor. 



266 



