92 



WATER REPTILES OF THE PAST AND PRESENT 



Jp\ From all of which it seems evident that the plcsiosaurs caught their 

 prey by downward and lateral motions of their neck, rather than 

 by quick swimming. 



Fig. 43. — Gastroliths and bones of an undetermined plesiosaur from llie Lower 

 Cretaceous of Kansas. 



About thirty years ago, the late Professor Seeley, a well-known 

 English paleontologist who devoted much attention to the study 

 of these reptiles, found with the remains of a medium-sized plesio- 

 saur nearly a peck of smoothly polished, rounded, and siliceous 



