| OCR Text |
Show 1896.] ANATOMY OF PETROGALE XANTHOPUS. 685 molar is calcified and can 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 Petrogale, showing os antiepilepticutn. The Atlas agrees with 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. The only Kangaroos in which I have found anything like a complete foramen in the transverse process are Hypslprymnus and Bettongla. In the Axis the vertebrarterial foramen is incomplete, and I found a similar condition in an older animal. On looking at the |
