BY C. W. DE VIS, M.A. 1067 



Teeth. — The incisor is bubprismatic, gently curved and slightly 

 inclined upwards, more strongly outwai'ds, from the incisive out- 

 let ; its lower surface broadest and with a shallow median groove ; 

 each of its lateral surfaces traversed by a broader and deeper 

 groove ; its upper surface much narrower than the lower, convex 

 and ending in the apex of an elongately triangular area of wear, 

 itself ending in a gouge-shaped cutting edge formed by the enamel of 

 the lower surface ; the tooth is equal in length to that of d* and m^ 

 together. The premolar p^ is slightly more than half the length 

 of d^, in shape it is an isosceles triangle with rounded angles ; it 

 consists of a single lobe bordered on the hinder half of its outer 

 and the whole of its posterior side by a broad cingulum inter- 

 rupted in the middle of its hinder course by a low link, and on the 

 intero-posterior angle of the tooth curving upwards upon the 

 adjacent angle of the lobe ; on the inner side of the fore end of 

 the lobe is a rudimentary pre-basal ridge; the summit of the 

 lobe is degraded by wear into a sub-triangular tract prolonged to 

 a point upon the anterior and intero-posterior angles of the lobe. 



The teeth of the molar series become broader by insensible 

 degrees, contrasting in this respect with the sudden increase in 

 breadth attained in iV. victorioe by the posterior two; as usual in 

 in-adolescent individuals of this genus their lobes incline more and 

 more inward as they recede, the teeth being still in that phase of 

 development iu which the posterior molars while moving forwarrls 

 are revolving upwards towards the horizontal level finally reached. 

 The intero-basal ridges are limited to the closure of the valleys on 

 that side. The exterobasal ridge of m' passes uninterruptedly 

 over the hinder lobe, closes the outer entry of the valley, and sub- 

 sides on reaching the fore lobe ; that of m- sends up a narrow- 

 tongue upon the hind lobe, and in conjunction with the upward 

 curve of the adjacent end of the anterior talon a broad and low 

 one upon the fore lobe. On m^ the vertical process from the ridge 

 is on the hind lobe, narrower than on m- ; on the fore lobe bi'oader 

 than that on the hind lobe, but narrower than that on the fore lobe 

 of m' ; on m^ these processes are about equal in breadth. A 

 strong conical tubercle arms the ridges of m^ and d* as they cross 



