156 



STORY OF 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 Pterodactylns specfabilis (Von 

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

 graphic slate, rt, the left prepubic bone ; on the right side this 

 bone is not shown, and the ilium is exposed. 



