PLATE 20 





1. Skull of Erpetosaurus minutiis Moodie, from the Cannelton slates of Pennsylvania. 

 Original in U. S. National Museum. Enlarged X 3.3. 



1. Skull and anterior part of body of rtyonius pfetinatus Cope, from the Coal Measures of 

 Linton, Ohio. Original in U. R. National Museum. X 1. 



3. Skeleton of 'Eosaurm>iis copei Williston, from the Coal Measures of Linton, Ohio. "The 



oldest known reptile from North America" and closely related structurally to the 

 Microsauria. Original in U. S. National Museum. X 1. 



4. Part of the ventral scutellation and ribs of Santvf>lt-itm ittgita/a Tope, from the Coal 



Measures of Linton, Ohio. Original in American Museum of Natural History X 1. 



