PLATE 20 





4. 



Skull of Erpetosanrus iniiiutus Moodie, from the Cannelton slates of Pennsylvania. 



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

 Skull and anterior part of body of Pfyoiiins pectinatus Cope, from the Co.il Measures of 



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

 Skeleton ol' Eosaiiraviis cofici \Villiston, 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. 

 Part of the ventral scutellation and ribs of Sauropleu>\i <//;'.'/i/A i d>|u-, I'mm tin- i'o:il 



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



