68 



5. W. WILLISTON 



of Chicago is one of a dozen or more found associated in a bone 

 deposit with as many more of Cacops and Casea. This reptile 

 attained a length of nearly four feet. It had a rather slender body, 

 a slender t^il, and rather slender legs, and was marvelously lizard- 

 like in form, and doubtless also in habits. Its teeth are slender 

 and pointed, and were adapted only for the capture of insects and 

 small animals. Its claws are sharp and its toes long. Without 

 great climbing powers, Varanosaurus and its alHes, of which there 

 are several genera, were fleet-running reptiles, living in the forests, 



Fig. io. — Casea hroilii, a pelycosaurian reptile forty-three inches in length. From 

 Texas. 



hiding under logs, and feeding upon the numerous cockroaches and 

 other insects. 



Associated with Varanosaurus in the same deposit of bones, 

 were a number of skeletons of Casea, a restoration of which is shown 

 in Fig. IO. It, too, was nearly four feet in length, but of very differ- 

 ent habits from those of Varanosaurus. Its skull was remarkably 

 short and thickset. It, too, has a very large pineal vacuity, which 

 curiously seems often associated with herbivorous or malacophagous 

 habits. The teeth were relatively few in number on the jaws, but 

 the palate was completely covered with conical teeth. Its body 



