SKULL 



41 



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

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

 pitals. In front of each exoccipital is another irregular bone (PR.OT) 

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



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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 completely united. 



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



