MB. G. BUSK ON THE EXISTING SPECIES OE HTiENA. 69 



is rather greater in H. brunnea ; but the zygoma itself is much 

 Broader in the vertical direction, and at the same time more hol- 

 lowed out on the inner aspect. The lower border of the orbit is 

 thicker, and, as it were, more everted in H. striata. The auditory- 

 opening is larger in H. brunnea. The tympanic bulla is rather 

 larger in proportion to the mastoid process in H. striata, but of 

 much the same form, otherwise, as in H. brunnea ; but the poste- 

 rior vertical border or angle of the mastoid process, forming the 

 continuation of the lateral occipital ridge, is concave or at any 

 rate straight iu H. brimnea, and convex in H. striata, in which 

 species also the point of the mastoid process is much slenderer. 

 The pterygoid gutter is much wider in H. brunnea. The form of 

 the palato-maxillary suture is alike in both ; and the length and 

 breadth of the palatals are pretty nearly equal, but are rather 

 wider, however, in the latter species. 



In H, brunnea the lower border of the horizontal ramus of the 

 mandible is much more convex ; the coronoid process longer and 

 more reclined, arching backwards, in fact, beyond the condyle, 

 whilst in H. striata it is greatly in front of it ; and in H. brunnea 

 the anterior border of the coronoid process on the outer surface 

 projects into a high sharp ridge with a deep concavity behind it, 

 which is altogether wanting in H. striata. The angular crochet 

 is much broader and shorter and more upturned in H. brimnea. 

 As has been before noticed, the mandibular condyle is much wider 

 in R. brunnea. The dental foramen is small and rounded in H. stri- 

 ata, larger and elongated in a vertical direction iu H. brunnea. The 

 mandible generally is thicker or more robust in H. brunnea. 



In the individual teeth we may remark that in the maxiUa, be- 

 sides the differences in dimensions which have already been ad- 

 verted to, considerable differences in form will be apparent. 

 The tubercle of the carnassial is larger and more rounded or bombe 

 in H. brunnea. The anterior talons of the 2nd premolar and of 

 the 3rd premolar are much more developed in H. striata. The ca- 

 nines and incisors are very much alike, except that the former are 

 larger in H. brunnea, and the tubercular molars are indistinguish- 

 able. In the mandible the incisors are more in advance of the ca- 

 nines in^. striata. The anterior talons of the 2nd andSrd premolars, 

 as in the maxilla, are very much more distinctly developed in H. 

 striata. 



From what has been said, it will be apparent that the distinc- 

 tions between the cranial and dental characters of H. striata and 

 H. brunnea are in themselves sufGiciently well marked to enable 

 us, where the characters are ascertainable, readily to distinguish 



