Ptyo. 



844 



subsequently others, from the famous Coal measure batria- 

 chian locality at Linton, Ohio, on none of which any trace of 

 fore limbs could be detected ; although on two of them hind 

 leg bones appear. The lance-shaped head, with its long slen- 

 der pointed muzzle, and large eye holes, is well shown ; teeth 

 conical, sharp, the larger ones striated lengthwise ; also a series 

 of minute conical teeth at the palate ; throat shield well marked ; 

 rod-scales cover the belly like bristles ; vertebras short, with 

 spiny fans on each side. XIIL 



Ptyonius ? serrula. Cope ( Oestocephalus. Proc. A. P. S . 



flate XXX 

 / 



1871, p. 177. Trans. Amer. Philos. Soc. Philada., 1874.) Pal. 

 Ohio, Vol. 2, 1875, page 379, plate 28, fig. 5, natural size ; plate 

 30, fig. 1, enlarged twice. Single almost complete specimen. 

 One-half as large a reptile as P. pectinatus ; but is not its 

 young, for its breast-shield has a more complex (mature) sculp- 

 ture, and the tail is relatively longer. In a second specimen 

 weak hind legs appear. Linton, O., Coal measures. XIII. 



Ptyonius uinchellanus. Cope ( Oestoeephalus uinchel- 

 lanus., Proc. Amer. Philos. Soc. 1871, p. 177, Coal measures.) 

 Pal. Ohio, Vol. 2, 1875, page 376, plate 28, fig. 1. twice life 

 size ; unique specimen of the head and fore part of the bodv 



