HYiENA. 483 



conical, recurved, like that of a small canine, with an anterior 

 and posterior edge, and a slight ridge along the inner side of the 

 base. The four intermediate small incisors are divided by a 

 transverse cleft into a strong anterior conical lobe, and a posterior 

 ridge, which is notched vertically ; giving the crown the figure 

 of a trefoil. The lower incisors gradually increase in size from 

 the first to the third ; this and the second have the crown in- 

 dented externally, but they have not the posterior notched ridge 

 like the small upper incisors ; the apex of their conical crown fits 

 into the interspace of the three lobes of the incisor above. The 

 canines have a smooth convex exterior surface, divided by an an- 

 terior and posterior edge from a less convex inner side : this surface 

 is almost flat and of less relative extent in the inferior canines. The 

 first premolar above {p 1) is very small, with a low, thick conical 

 crown : the second presents a sudden increase of size with an ad- 

 ditional posterior and internal basal ridge to the strong cone. 

 The third premolar exhibits the same form on a still larger scale, 

 and is remarkable for its powerful aspect. The posterior part of 

 the cone of each of these premolars is traversed by a longitudinal 

 ridge. The fourth premolar (p 4) is the carnassial tooth and has 

 its long blade divided by two notches into three lobes, the first a 

 small thick cone, the second a long and compressed cone, the 

 third a horizontal sinuous trenchant plate : a strong trihedral tu- 

 bercle is developed from the inner side of the base of the an- 

 terior part of the crown. The single true molar of the upper jaw 

 (fig. 7, m 1) is a tubercular tooth of small size : it is transversely 

 oblong in the HycBna vulgaris and H. fusca ; smaller and sub-cir- 

 cular in the Hyana crocuta ; still smaller and implanted by a single 

 fang in the Hycena spelaa : in all the existing species of Hyaena it 

 has two fangs. The first premolar of the lower jaw (fig. 6, p 2) 

 fits into the interspace between the first and second premolars 

 above, and answers, therefore, to the second lower premolar in the 

 Viverrida; : it is accordingly much larger than the first above ; it 

 has a ridge in the forepart of its cone, and a broad basal talon 

 behind. The second {p 3) is the largest of the lower premolars, 

 and has an anterior and a posterior basal ridge, with a vertical ridge 



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