Cope.] 224 [Dec. 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 Genus may require reconsid 



cration. 



Measurements. M. 



Anteroposterior diameter of crown ■. 052 



Transverse do. in front 035 



"Width of anterior external crescent 018 



Elevation of crown externally 020 



Prom 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. 



DlCOTYLES SERTJS, 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- 



