4 



PROFS. B. L. BHATIA AND BAIN I PR ASH AD ON THE 



between the fronto-parietal and exoccipital on the inner side and 

 the inwardly directed horizontal flange of the squamosal, which 

 partly overlaps it, on the outer. Anteriorly the prootic bone 

 forms nearly the whole of the anterior wall of the auditory cap- 

 sule ; a small area on the outer side of this anterior wall remains 

 cartilaginous. On the inner side this anterior portion curves 

 forwards to form the posterior part of the inner wall of the 

 orbit. In this angle is situated the foramen for the exit of 

 cranial nerves v. to vii. The foramen is completely surrounded 



Text-figure 3. 



m;iv 



JR. tigrina ; lateral view of skull. 



Text-figure 4. 



H. tigrina ; posterior aspect of skull. 

 For explanation of the letters see text-fig. ]. 



by the prootic bone, and is not merely a notch completed below 

 by cartilage. The ventral and the posterior walls of the auditory 

 capsule are cartilaginous. Postero-laterally the prootic extends 

 to meet the exoccipitals ; at the junction of the two is a curved 

 irregular depression, the fossa tympanica, which lodges the 

 auditory ossicles and in which the foramen ovale is situated. 

 The suspensorium of the lower jaw is attached more externally 

 to the side of the auditory capsule. The styloid cartilage is 

 attached to the outer side of the cartilaginous portion of the 

 capsule. 



