534 R. L. Moodie — Fossil Frogs of North America. 



separation of the tibial and fibular elements, thus plainly 

 showing that the frogs have had a long pre-Jurassic history 

 (fig. 1, h). 



Fig. 1. 



Fig. 1. Professor Marsh's drawings of Eobatrachus agilis from the 



Jurassic of Wyoming. 

 a. From Can 4. Four views of the humerus (1862) collected in the 



Como beds. x 4. 

 6. Three views of the tibio-fibula (No. 1394) from tray 13 collected 



in the Como beds. x 4. 

 c. Three views of the ilium — the inner, the posterior and the outer. 



(No. 1568) from Can 1. x 4. 



Another humerus (No. 1863 Yale University Museum) is 

 similar to the one already described, although smaller. 



The Jurassic frog thus indicated was an animal about the 

 size of Bufo debilis Girard of western Kansas and Texas. In 



