156 



STORY OP THE REPTILES 



mammals had then taken to the water. Many may 

 have fallen before great numbers of small foes, just 

 as whales and sharks perish now; or some special 

 parasite or disease may have attacked them. 



Fig. 76. — The nearly entire skeleton of Pterodactylus spectabilis (Von 

 Meyer), as shown by the two halves of a split block of litho- 

 graphic slate, a, the left prepubio bone ; on the right side this 

 bone is not shown, and the ilium is exposed. 



