Cope.] 224 [Dee, 21, 
A cylinder of small diameter stands near the apex of the fold of the in- 
ternal enamel wall, which separates the internal crescents. There is a 
cingular ridge descending inwards on the interior and posterior extremities 
of the base of the crown, and below and exterior to it the enamel surface 
is very rugose. The surface of the external enamel is smooth. The 
enamel of the lake borders is seamed with shallow vertical sulci. The 
crescents are wide and the lakes narrow. 
The reference of this species to the genus Cervus may require reconsid- 
eration. 
Measurements. M. 
Anteroposterior diameter of Crown.........---.e00ce0% 052 
Transverse 06. AD. (TON. wwscaa ness saeeieeane gens coe 035 
Width of anterior external crescent.......... .....--5- 018 
Elevation of crown externally. ...........cceeeeeeeees 020 
From the pliocene formation of Oregon. 
The Loup Fork beds have been usually referred to the Pliocene horizon, 
but I have offered reasons why they should be regarded as of Upper Mio- 
cene age. The horizon from which this and some other species herein 
described, found in Oregon, represent the Pliocene formation much more 
nearly. > : 
DIcOTYLES SERUS, sp. NOV. 
This species of hog is indicated by a mandibular ramus which lacks 
the angles, and supports the dentition of both sides excepting the third 
right molar. Other portions of the skeleton are associated. A second 
specimen is the symphysis with the incisor teeth. The remains indicate 
an animal something larger than the white lipped peccary Dicotyles 
labiatus. 
Dentition of the mandible, I.2;C.1; P.m.3; M.3. Inferior canines 
triangular ; superior canines decurved, triturating the inferior. Last 
inferior molar with well developed heel. Last premolar like the first mo- 
lar. First premolar with anterior single tubercle and posterior lower tu- 
bercle heel ; second premolar similar but wider, and the anterior tubercle 
divided. Molars consisting of four principal tubercles opposed in pairs, 
with some accessory ones between them. 
The rami are robust and of moderate depth ; the symphysis is elongate 
and contracted. The suture of the latter remains on the inferior side, but 
is obliterated on the upper surface. The symphysis is trough-like and the 
narrow alveolar ridges of the diastema are concave inwards. 
The incisor teeth are directed forwards, and are closely approximated 
and parallel. The fang of the second lies close to that of the canine, and 
the edges of the crowns together form a parabola, the enamel being pro- 
longed posteriorly on the external side of the external tooth. The crowns 
of the median teeth are not expanded laterally, nor much depressed at 
the apex ; as half worn in the specimen, they form a wide transverse 
oval. The canines curved upwards and outwards and present their tritu- 
rating surface a little external to directly backwards. Their section is tri- 
