DAWKINS ON THE DENTITION OF HTJENA SPELiEA. 89 



transverse groove, the larger anterior, the smaller posterior. The 

 latter of these also is bisected by a groove running parallel to the 

 median line. On the outer side of the anterior aspect is a slight 

 ascending ridge which is more marked in Incisor 2. The fangs are 

 very much compressed, and have square bases. Incisor 3, in its stout 

 caniniform shape and rounded fang, contrasts strongly with the rest. 

 The crown is composed of a stout recurved cone traversed on the 

 anterior and inner side by a trenchant ridge, that, after sweeping 

 round the inner base, reascends the crown on the outer and posterior 

 side. The area circumscribed by it is very nearly one half of the 

 crown. The upper canine is differentiated from the lower by the ab- 

 sence of the lateral curvature of the fang. Its crown is untraversed 

 by the longitudinal grooves so constant in the canines of the Felidse. 



Of the Premolars the crown of the small mono-fanged first, is 

 obtusely pointed, incurved and traversed by a ridge ; the cingulum 

 is very pronounced on the inner side. That of the second is com- 

 posed of a stout obtusely pointed cone, surrounded on every side 

 but the posterior by a stout cingulum, very marked on the anterior 

 and inner aspects. At its inner base are two small pits of greater or 

 less depth, and posteriorly is a small secondary cone, the feeble re- 

 presentative of that in H. striata. It is traversed by an ascending 

 ridge, and supported by two cylindrical incurved fangs. 



Premolar 3, by far the stoutest of the conical premolars, is com- 

 posed of a stout cone incurved and slightly inclined backwards, sup- 

 ported by two incurved divaricant fangs. On the anterior and inner 

 side is a stout ascending ridge, that with its fellow of the posterior 

 side includes an area equal to one third of the tooth. Anteriorly 

 the cingulum is thickened and presents a talon-like form : posteriorly, 

 also largely developed, it sometimes bears a small trenchant cusp, as 

 that figured in the Ossemens Possiles.* The fourth premolar, or the 

 upper carnassial, consists of two portions ; the cuspid anteriorly and 

 the sectorial posteriorly, the former playing on the interspace be- 

 tween the lower molar and the lower premolar four, the latter play- 

 ing scissor-fashion on the corresponding portion of the lower molar. 

 On the inner side of the exterior stout conical cusp, which is much 

 lower than the anterior blade, is the inner tubercle of Professor 

 Owen. Each portion of the crown is supported by a fang, the two 



* Tom. cit.Pl.XXX. Fig. 12. 



