70 



GUIDE TO THE FOSSIL MAMMALS AND BIRDS. 



Zool. Dept. 



Gallery of toothed whales of the Miocene period differed from every 

 Cetaeea, Cetacean now livingj and approached more normal mammals 

 in the circumstance, that all their teeth were enamelled, 

 while some of those at the back of the jaw were two-rooted. 

 Instructive illustrations may be seen in plaster casts of skulls 

 of Squalodon grateloupi from the Miocene of France and 



Fig. 66.- 



-Tympanic bone of Whalebone-whale {Balxna primigema), from 

 the Bed Orag of Suffolk ; one-half nat. size. 



Pig. 67. — Skull (A) and upper molar tooth (B) of Zeuglodon 

 cetoides, from the Eocene of Alabama, U.S.A. ; A greatly 

 reduced, B one-fifth nat. size. 



Bavaria, and in an almost unique skull of Prosgualodon 

 australis from the Patagonian Formation of South America. 



The Miocene toothed-whales with enamelled two-rooted 

 teeth are especially interesting, because they connect the 

 modern simple-toothed tribes with some whale-like creatures, 

 the Zeuglodonts, which appear to have flourished in the seas 



