92 



WATER REPTILES OF THE PAST AND PRESENT 



From all of which it seems evident that the plesiosaurs 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 the Lower 

 Cretaceous of Kansas. 



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

 Enghsh 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 poHshed, rounded, and siHceous 



