7G MR. G. BUSK ON THE EXISTING SPECIES OF HTiENA. 



raucli lees inflated, and are angular on the under surface. In all 

 three specimens of form A the bullse are very flat and angular. 

 3. In all the three instances comprehended under form A the 

 upper tubercular molar is either entirely wanting without leaving 

 even the trace of an alveolus, or is extremely minute ; whilst in 

 form B it has the dimensions given in the Table, and where it is 

 wanting it has left a distinct and well-formed biradicular alveolus. 

 Secondly, the digital fossa at the root of the upper carnassial is 

 much shallower in the form A. The palato-maxillary suture in 

 form A is rounded in front, and does not extend forwards beyond 

 the level of the 4th premolar, whilst in 822 i it forms an acute 

 angle in front and reaches to nearly the middle of the 3rd pre- 

 molar." "In 822 « this part of the palate is wanting. But in the 

 crania No. 4447, Eoyal College of Surgeons, and No. 37783, British 

 Museum, this suture is rounded as in form A ; whilst again in M. 

 Lartet's cast above referred to it is angular in front ; so that I am 

 in doubt as to the value to be placed on the form of this suture 

 as a diagnostic mark, and merely record the facts for future con- 

 sideration. With respect to the individual teeth, little can be 

 said, on account of the very imperfect state in which the majority 

 of them exist in the three A crania. I may observe, however, that, 

 besides its far smaller size, the 4th premolar is remarkable, in form 

 A, for the proportionately small size of its anterior cusp, which 

 is merely represented by a rounded tubercle, which is so much 

 lower than the others as to be almost untouched by wear, although 

 the latter are much worn. And the internal tubercle is also 

 much smaller and more rounded. I will here add what I find in 

 Dr. Falconer's notes respecting his comparison between 1232a 

 and 1232 & and 822 a and 822 &. Eegarding the latter as H. 

 brunnea, he says of it : — 



(a) The cranium is proportionally longer and higher, 



(b) The cerebral case is less inflated and more compressed 

 upwards. 



(c) The sagittal crest is longer, much higher and more pro^ 

 nounced, and it projects further backwards beyond the condyles. 



■ ((?) The auditory bullse are much more inflated. 



(<?) The facial portion is more elongated and less strangled. 



(f) The infraorbital region is higher, more convex and narrower. 



(y) The lower rim of the orbit is broader and more lip-like 

 in H. striata. . With respect to the mandible he remarks : — 



(«) The horizontal ramus is less suddenly turned upwards 

 behind. 



