SYNOPSIS OF THE VERTEBKATE FAUNA OF THK I'UEKCO SERIES. 317 



CoNORTCTES COMMA Copc ; loc. cit., Hexodon mole»tu» Cope ; loc. cit., fig. 3. 



This animal was about the size of a wolverine, of which species one is romindcd 

 by its robust characters. Ft liad an elevated sagittal crest and a strong iiiion. In a 

 series of teeth which arc but little worn the following characters may be discerned. 

 The crown of thi- infeiior canine has a flat inntr face, beyond which llie antciior sur- 

 face extends inwards, forming a rib-like border. The enamel on the internal and [)os- 

 terior faces extends but a short way from the apex, and is thin, while on the convex 

 anteroexternal face, it extends below the usual position. It thus approaches the condi- 

 tion seen in Ileniiganus. A similar state of affairs is seen in the molars, where the 

 enamel is extended much further on the external face of the inferior and the internal 

 face of the superior molars than is usual, approaching the genera mentioned and also 

 the TjeniodonUi in this respect. There are no cingula on any of llu' molars of either 

 series excepting on the external side of the superiors ; and there it sends out a process 

 or cusp between the two external cusps. The crowns of the inferior molars are notched 

 at the junction of the antei'ior and posterior parts. The notch is the section of a 

 vertical groove from the base of the crown on the external side, and of a very short 

 superficial one of the internal side. The fifth cusp is median, and about opposite the 

 rim of the heel in elevation. The grooves of the first premolar are similar to those 

 of the ti'ue molars. There is no anterior basal cusp. The heel is large and has a 

 raised border on the posterior and inner sides, and an external median lateral conic 

 cusp. This when worn joins the cuived crest, forming a comma-shaped figui'c. 



A si)ecimen represented by fragments includes a canine chai-acteristic of the 

 genus, but of such relatively smaller size, that I suppose the animal to be a female. 



Seven individuals have come under my observation. 



ONYCIIODKCrKS Cope, gen. nov. 



Superior molars ti'itubercular, the external cusps distinct ; the internal with the 

 intermediate confounded in a prismatic form with flat grinding surface, and whose 

 internal angle rises claw-like to an elevation equal to that of the external cusps, and 

 without cingula or api)endicular cusps. First premolar with but one external and 

 one internal cusps. Inferior molars seven, the true molars Avith five cusps, the ante- 

 rior triangle distinct. Last inferior molar with a heel; canine large. 



Caudal vertebne robust. Iliiini rather slender, flat-triangular in section, and 

 with a small anterior-inferior spine. Scapula with coracoid hook, and abruptly rising 

 spine. Astragalus with unequal trochlear ridges, the internal the lower. Internal 

 face oblique, but less so than in the species of Miochenus where it is known, and not 



