Miscellaneous. 333 
Generic characters. The lower canines are erect and functional, 
giving the name to the genus. The lower incisors are two on each 
side and semiprocumbent. The lower premolars, with the excep- 
tion of the first, are somewhat simpler than the molars, but have 
the rhinoceros pattern of two inward-opening crescents directed 
forwards. The upper premolars have distinct posterior crescents 
and small postero-internal cusps. The postglenoid and posttym- 
panic processes apparently do not unite to surround the external 
auditory meatus. ‘There is a sagittal crest separating the temporal 
fossee. 
This genus differs from Amynodon in the erect canines, in the 
possession of a posterior crest and distinct though small postero- 
internal cusp on the second and third upper premolars ; finally, in 
the fact that the premolar pattern in both jaws is like that of the 
molars. In Amynodon the canines are nearly procumbent, and the 
premolars are all unlike the molars. It is singular that this genus, 
belonging to a more recent geological formation than Achenodon, 
should have less of the typical rhinoceros structure in its molars. 
Orthocynodon antiquus, gen. et sp. nov. 
2-2? ale 1 Boo he BS 
Dental formula, z 39 °[ pp PM ET Ma% = 
The specimens consist of the skull and lower jaw of one indi- 
vidual, and a portion of the skull containing the molar series of 
another. In each the upper canines and incisors are wanting. The 
lower incisors are close to the canines; they are semierect in posi- 
tion and placed in a quarter circle. They have slight fangs and 
sharp crowns, with low cingula posteriorly. The canines are almost 
trihedral in section, and curve upwards and slightly backwards, 
worn at the back of their pointed tips by the upper teeth. A dias- 
tema of 2 inches separates them from the premolars. The lower 
premolar-molar series differs only in size and minor details from 
that of a young specimen of Rhinoceros indicus. The first premolar 
has a simple crown rising to a single point and supported on two 
fangs. The inner face is irregularly concave, as in the rhinoceros. 
Each of the remaining teeth presents two forward-opening crescents 
of similar pattern. The third and fourth upper premolars are pre- 
served in our specimens, and the upper molars are complete. The 
premolars present an external longitudinal ridge; from it arise a 
broad anterior and a narrow and somewhat low posterior crescent, 
opening backward; the postero-internal cusps are small. The 
molars are like dose of the rhinoceros in the proportion and dispo- 
sition of their crescents. 
The skull is about 14 inches long and 5 inches deep. The occi- 
pital condyle resembles that of the Indian rhinoceros. There is a 
recurved paroccipital process having a long forward union with the 
posttympanic. The posttympanic and postglenoid processes do not 
unite as in the modern rhinoceros. In common with all the Eocene 
Ungulates, there is quite a high thin sagittal crest and somewhat 
deep temporal fossa, quite unlike the Indian rhinoceros. The skull, 
