666 Fossil Remains of the Ddduptir Collection. [Oct. 



due to a more advanced age than that to which the fossil fig. 5 had 

 arrived. 



Fig. 4 is the left half of a fossil cranium, in which the two rows of 

 teeth have accidentally worn irregularly ; the left side is given, heing 

 the one in which the enamel curves of the last molar have assumed 

 forms which, on comparison with the foregoing specimens, will be 

 found slightly to differ. The corresponding tooth in the right maxillary 

 is both considerably longer than its fellow, and bears a greater simi- 

 larity to those of the other skulls. The canines of the male were 

 large and ribbed on the upper surface, but the fossil upper jaws pre- 

 senting none perfect, their shape and direction are not ascertainable : 

 a detached fragment indicates a wear similar to that which occurs in 

 the tusk of the wild hog : from the lower jaws little can be deduced, 

 fig. 3, Plate XXXIV., being the only adult one which possesses the 

 canines perfect. This specimen would have accurately indicated the 

 wear had it been possible to clear the canine of a thin hard coating of 

 the matrix, which, though not sufficiently thick to affect the general 

 shape of the tusk, conceals the worn, and does not allow it to be distin- 

 guished from the unworn, surface. 



The canines of the female were small, as may be seen by the alveoli 

 of fig. 3, Plate B. 



The incisors in fig. 3, Plate B, are much used : only four are 

 visible ; the matrix, which cannot be altogether cleared from the ante- 

 rior of the palate, probably conceals the alveoli of the posterior incisors. 



Lower jaws. The early state of the milk teeth when the 4th or tri- 

 partitioned molars is commencing to be used, is exhibited in the frag- 

 ment of which fig. 1, Plate C, is a representation ; the 5th molar is 

 also here seen prior to undergoing detrition. 



The next stage exemplified by a specimen, is that in which the 5th 

 is a little worn ; the 3rd and 4th are a good deal so, and the 6th is just 

 showing the tops of its collines ; the central early incisors are much 

 used, but not yet shed ; the posterior ones are already replaced by 

 their permanent successors, and the canine is showing its point : this 

 jaw, as before remarked, was found together with its cranium. 



By the time that the 5th molar is much used, and the 6th a little 

 so, the milk teeth are all cast, and the permanent ones in use. Fig. 3, 

 Plate C, exemplifies this step ; here the 7th molar is half developed, 

 the 2nd, 3rd, and 4th are slightly abraded ; the canine, which is broken 

 at the point, rises with a gentle divergence, and instead of the trian- 

 gular section observable in the tusk of the existing species, has one 

 nearly elliptical, being only somewhat flattened at its posterior edge. 



