290 



ME. BUSK ON THE REMAINS OF 



" Of the last upper milk-iuolar (in.-m. 4) there are numerous fragments, but unluckily 

 uo entire tooth, in the collection. The most perfect of the series is the specimen re- 

 presented by figs. 8 and 8 a, which consists of the intermediate portion, comprising six 

 ridges, but mutilated both in front and behuid. It is evident that of the hind portion 

 only one or two collines are wanting, these being the last ridge and posterior talon ; 

 and as regards the anterior end, the fractured section is seen to pass vertically through 

 the middle of the large front fang, indicating that the front ridge and talon alone are 

 there wanting. The tooth, when entire, must have been nearly in a germ-state, as the 

 tips alone of the front remaining ridge are affected by wear. The height falls off very 

 rapidly from the front backwards ; and the ridges are high in proportion to the width. 

 This tooth is inferred to have been the upper mUk-molar corresponding in age with 

 fig. 5 of the lo^ver jaw. The dimensions are : — 



in. 



Length of fragment of crown 1 -4 



Width in front 0-95 



Width behmd 0-85 



Extreme height of crown-ridges ' 2-3 



Tliere are no means of determining with certainty what was the precise number of 

 ridges that entered into the composition of this tooth* ; but assuming from the data 



* Besides tlie teeth noticed by Dr. Falconer, the collection contains an entire upper molar which appears to 

 correspond so closely in dimensions with the fragment above described, and represented ui fig. 8, as to leave no 

 doubt in my raiud of its beiug a corresponding tooth in the series, whatever its place may be. So far, also, 

 as can be judged from the little-worn condition of the machcerkhs, and from the thickness of the plates, it would 

 seem to belong to the same type as fig. 9, from which tooth, however, it differs most remarkably in the height of 

 the crown, though nearly corresponding in all other dimensions. As the specimen is one of great interest, and 

 in nearly perfect condition, I have thought it might be useful to add figures showing its main characteristics. 



The tooth is clearly an upper molar of the right side ; but whether it is to be regarded as a milk- or as a 

 trxie molar, opinions may be divided. 



