460 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Apr. 27, 
- Most of the specimens are much broken, and consequently but 
ill fitted, more especially in the case of the genus Rhinoceros, for 
the determination of specific characters; but amongst them are 
several which will amply suffice for the purpose; and it is to these 
only therefore that I shall confine what I have to remark. 
1. The Teeth. 
The collection, as it exists in the College Museum, includes six 
molars—three maxillary, and three mandibular. Of the former, two, 
though much injured, are sufficiently perfect to afford good charac- 
ters, the third is too imperfect to be of any use. 
The most characteristic teeth are the two upper molars (num- 
bered 877 and 878) ; and they are clearly the opposite teeth of the 
Fig. 1.—Left Upper Molar of Rhinoceros from Oreston. 
a. Anterior vallum or “guard.” 6. Entrance of median sinus (“anterior 
valley”). _c. Uncus (“crochet”). d. Columella. ¢. Crista (“anterior 
combing-plate”). f. “First (“anterior” or ‘‘angular”) costa. g. Second 
costa. f. Anterior sinus. 
same individual. As to their place in the series, opinions may very 
probably differ. In the Museum Catalogue they are described as 
the first molar (m1); and Dr. Falconer, in the note above referred 
to, also appears to have assigned that position to them. I am 
myself, however, more inclined to regard them as the second molar 
(m 2), chiefly for the reason that the anterior outer angle is very 
acute, which shows that the tooth was oblique—and also because 
the anterior yallum is not prolonged in the form of a cingulum on 
the internal face of the anterior column, which it most usually is, 
but not always, in the m1 of R. leptorhinus. And in all species of 
