SKULL 



41 



above and below it, and extending over a considerable portion of the 

 posterior surface of the auditory capsule. These bones are the cxoai- 

 pitah. In front of each exoccipital is another irregular bone (PR. OX) 

 forming the front part of the auditory capsule, and called the pro-otic. 



Each pro-otic is separated from the corresponding exoccipital, in young 

 frogs, by a band of cartilage, but in old specimens the two bones are 

 more or less completel)' united. 



In the disarticulated skull it can be made out that the exoccipital and 



