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and have sharp edges serrated laterally, they haye not met along 

 the central line. The tushes are a litttle more evident, the re- 

 maining incisor are temporary and merely insignificant stumps 

 (Plate II, C. 1 and 2). The condition of the upper jaw is now 

 interesting. For the specimen under examination it is uneven, in 

 that whereas there are five teeth in the right side anterior to the 

 molars, on the left side there are but three. The five are as 

 follows, from before backwards : — A rudiment of an incisor, 

 which probably would not be detectibie through the substance of 

 the tooth-pad, a large alveola from which the corner incisor has 

 dropped, a young tush replacing the corresponding worn out 

 temporary tooth, a small wolf's tooth, and the usual large wolf's 

 tooth (Plate III, C). 



At six years of age the central and primary intermediate 

 incisors of the lower jaw are well developed. The former meet 

 at the inner edges of the thin broad part and slightly overlap. 

 They also are worn at the margins and have well defined necks. 

 The latter are very fresh looking, broad at the gutn, unworn at 

 the edges, and finely notched in a very pretty manner, their 

 inner edges overlap the centrals, as may be seen in looking at 

 them from above. The second intermediate is in the act of 

 being replaced but it and the corner tooth are insignificant and 

 invisible from below. In the upper jaw the tush and its successor 

 in the series posteriorly are fine large teeth, the lower tush is 

 progressing. The upper incisors are small (Plate IV;. 



At 7 years : In the upper jaw the tush and its incisor in front 

 and successor behind are fresh, strc»ng, and sharp, traces of 

 rudimentary lateral incisors are present and the corner incisors 

 fit in fi'ont and the tushes behind the corner lower incisor in a 

 formidable manner. This coruer lower incisor is a veritable 

 tush in shape and in the way it becomes worn, i.e., so as to form 

 a circular or oblong table. The central and intermediates 

 (primary and secondary) have now well defined nipping edges 

 with marks more or less distinct ; they look crowded together, 

 as they overlap, being placed en echelon from before backwards 

 and outwards ; the centrals meet above and form each a small 

 lateral table here Wv mutual friction (Plate X). 



