290) MR. BUSK ON THE REMAINS OF 
“ Of the last upper milk-molar (m.-m. 4) there are numerous fragments, but unluckily 
no entire tooth, in the collection. The most perfect of the series is the specimen re- 
presented by figs. 8 and 8a, which consists of the intermediate portion, comprising six 
ridges, but mutilated both in front and behind. 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 milk-molar corresponding in age with 
fig. 5 of the lower jaw. ‘The dimensions are :— 
in. 
Length of fragment of crown .............6.44- 1-4 
WVidthtimatront, »--ceeia. ticae teh doe hettssee sets 0-95 
Width bebind, oo niy..02-t-e-entarepaaiine: aaa 0-85 
Extreme height of crown-ridges ....... sfeeione 2:3 
There 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 the 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 in fig. 8, as to leave no 
doubt in my mind of its beg 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 machwrides, 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 
true molar, opinions may be divided. 
_ a 
