66 MR. G. BUSK OK THE EXISTING SPECIES OE HTiEKA. 



3. In having a more or less distinct accessory point on the 

 inner side of the hinder cusp of the lower carnassial tooth. It 

 is true that a minute tubercle, or rudiment, rather, of a similar 

 point is not unfrequently seen in nearly the same situation in H. 

 crocuta, and perhaps still more frequently in S. spelcea. But in 

 these species it never assumes anything like the size it presents 

 in H. striata and S. brimnea, though it is considerably less in the 

 latter species than in the former. Some difference also may be 

 noticed in the exact situation of the accessory point in S. crocuta 

 and spelcea, in which species it is usually situated as it were in a 

 hoUow beneath the base at the inner and hinder border of the 

 posterior cusp ; whilst in S. striata and Irunnea it- rises distinctly 

 on the inner face of the cusp. 



Other points of agreement between the two Euhygenas may be 

 noticed — as for instance the presence in both of a distinct an- 

 terior talon to the 2nd premolar, and of a well-defined anterior 

 talon to the 1st, 2nd and 3rd premolars, which is larger, however, 

 as are all the talons in fact, in H. striata. In H. striata and 

 H. Irunnea, the 2nd and 3rd premolars are placed with their long 

 axis oblique to the line of the alveolar border, and the 3rd pre- 

 molar is obliquely truncated behind, whilst in S. crocuta this 

 tooth is square behind. 



The opening of the nares is rounded in H. crocuta, and more 

 or less pyriform in H. striata and H. Irunnea, in which also the an- 

 terior palatine foramina are very much larger in proportion. 

 Other minor points might be noticed ; but the above are abun- 

 dantly sufGicient to indicate the affinity of H. striata and S. hrun- 

 nea, and their common distinction from the eroe^^^fa-group. 



Having thus pointed out the more important particulars in 

 which S. striata and S. hrunnea agree, it remains to indicate those 

 in which the difference between them is chiefly shown. So far 

 as the general dimensions of the cranium are concerned, it may be 

 said that, whilst the average length (extreme) of the cranium, 

 measured from the incisive border in front to the point of the 

 sagittal crest behind, appears to be greater in S. hrunnea (1011 

 to 904)*, in regard to the zygomatic width the preponderance 

 is greatly in favour of S. hrunnea, in which this width is on 



* It should be stated, however, that these numbers are taken only from my 

 own measurements, according to which the maximum length of the cranium in 

 H. striata is 950, but that M. de BlainviUe gives the maximum for that species 

 at 1070. But this difference may perhaps be due to the circumstance that he 

 has included a specimen oiS.fusca under that appellation. 



