964 THE JOHN DAY FAUNA. 



NiMRAVUS GOMPHODUS Oope. 

 American Naturalist, 18S0, p. 844. Bulletin U. S. Geolog. Surv. Terrs., 1881, p. 167. 



Nimravua brachyopa Cope. Proceeds. Phila. Acad., 1879, 170; uot Machcerodua hrachyopa. Proceeds, 



Amer. Philos. Sec, 1878, p. 72. 



Plates LXXIII; LXXIV, fifjs. 1-2. 



This feline is represented in my collection by parts of three individuals. 

 The first includes a skull with one side and part of the other completely 

 preserved, with the cervical and some dorsal vertebrge; the second is known 

 from the posterior part of a mandibular ramus supporting three molar teeth; 

 the third specimen embraces an entire mandibular ramus with all the teeth, 

 and a femur, both having been found lying close together in the rock. 



The skull of the first specimen has the mandible attached, with the 

 mouth partly open, as represented on Plate LXXIII. It is as large as the 

 large forms of the panther, and exceeds slightly the skull of the Archodurus 

 dehilis. It has very much the general proportions of that of the panther 

 in the regular convexity of the profile of the frontal and nasal regions, the 

 length anterior to the orbit, and in the degree of production of the inion. 

 The length anterior to the glenoid cavity is relatively greater than in the 

 panther, so that the mandible is longer. The front is moderately convex 

 in transverse section, and is prolonged farther posteriorly than in the pan- 

 ther, through the more gradual convergence of the borders of the tem- 

 poral fossa, resembling in this the tiger rather than the other species of Uncia. 

 The obtuse postorbital angle is more prominent than in the Archodurus 

 dehilis, but does not deserve the name of a process, as it is- in the large 

 recent cats. The side of the face in front of the orbit is gently concave ;^ 

 in front of the foramen infraorhitale exterius it is nearly plane. The con- 

 traction behind the orbits is about as in the panther. The zygomatic arch 

 is quite as prominent anteriorly as in the recent cats, but at the middle of its 

 course it is less convex or flatter, as in the Archodurus dehilis. The inion pro- 

 jects beyond the vertical line of the occiput, but not so far as in the tiger or 

 the Pogonodon platycopis. The occiput is not higher than wide above, and it 

 is divided by a keel which fades out on the inferior third. The lateral crest 

 is low above the paroccipital process, where it divides into two low ridges. 

 One of these goes to the paroccipital process and the other to the base of 



