1896.] 



ANATOMY Of PBTROGALB XANTHOPUS. 



685 



molar is calcified and caa be seen by cutting away the maxilla ; it 

 has not yet replaced the two premolars. The last (4th) molar is 

 being cut. 



Fig. 1. 



Skull of Fetrogale, showing os antiepilepticiim. 



The Alias agrees mth that of most Kangaroos in wanting the 

 foramen in the transverse process and in the incomplete ventral 

 arch, which is ligamentous for about one-sixth of an inch. 



In an older specimen of the same animal I found this space 

 reduced to a mere suture. Tiie only Kangaroos in which I have 

 found anything like a complete foramen in the transverse process 

 are llypsiprymnus and Betfongia. 



In the Axis the vertebi-arterial foramen is incomplete, and I 

 found a similar condition in an older animal. On looking at the 



