1884.] 565 [Cope, 
specimen now described, the posterior internal rudimental cusp is quite 
well developed ; in the two other specimens now before me it is not so 
large. The superior canine is elongate, and not very robust, and its con- 
vex anterior border is directed partly posteriorly at the apex. The 
enameled portion of the crown is quite short. The premaxillary bones 
are narrow and weak, and are separated so as not to be in contact on the 
middle line. Its border displays two minute alveoli, from which teeth 
have been shed. I do not suppose that their presence is constant in the 
species. The external alveolus is twice the diameter of the internal. The 
inferior incisors are of normal number, but are very narrow, and much 
crowded. The canines are very narrow, but are longer than the incisors. 
The first inferior premolar is more caniniform than in any other species of 
Oreodontidee known to me. The crown is a compressed oval in section, 
and is not expanded at its base. It is enameled to within 5 mm. of the 
alveolar border. A considerable diastema separates it from the second 
premolar. The description of the remaining teeth I take from a separate 
ramus of similar dimensions, as they are concealed in the type by their po- 
sition in juxtaposition with the cranium. The cusps of the true molars are 
pyramidal and acute, and entirely separate from each other. The external 
faces of the external are convex, their internal faces flat. The external 
faces of the internal are convex, the internal faces concave at the base, and 
convex near the apex. The anterointernal angle of the posteroexternal 
cusp extends to the base of the anterointernal cusp. The only difference 
between the first true molar and the fourth premolar, is that the anterior 
crest of the anteroexternal cusp is continued round to the front of the an- 
terointernal cusp, and to the internal side of the crown ; and the apices of 
the two anterior crests are separated by a shallow notch. The second in- 
ferior premolar has two roots. The heel of the third true molar is well de- 
veloped, and is convex posteriorly. 
Measurements. M. 
Length from occipital condyles to postglenoid process,. .038 
bY hh Ny . ‘* preglenoid border... .058 
ah i ey “‘nostfrontal process. .104 
Mu os Ms he “ canine, inclusive.... .226 
My ‘f orbit to canine inclusive ...... ss+.e.++. 085 
r of mandibular ramus from condyle.........+.+ 176 
“ ‘‘symphysis mandibuli below........+.+. spre sh UD 
Width of occipital condyles inclusive......+ S dieaaa aw wee 046 
WN SP GOCIDUUT ADOV.G sions ed niic be sinha optatens asd a SesiNie ED 
“ ‘‘ between otic bulle.... 1c hen 
i ‘at postglenoid processes inclusive........ rere) 
‘< ‘‘ of skull above glenoid surfaces,............ 100 
a) ETO" DOLOW “ONDIER) ba aie si dale bi sis sya cw bah lanes 099 
WY Poe» DRtWCGM. OLDIE b9'ecisierd afl aie CE NORPRO =) 
44 SY BG CUMS Oe OAMING CAV EOy iivisiccsne, «ORO 
