Genera q/'Felidse and Canidae. 95 



the supraorbital region, and is grooved mesially. The post- 

 orbital processes are mere angles, and are flattened from 

 below. The cranium is much constricted behind the orbits, 

 where its diameter is not greater than the width of the pre- 

 maxillaiy incisive border. The sagittal crest is much ele- 

 vated, and forms a perfectly straight and gradually rising 

 outline to its junction with the incisor. The borders of the 

 latter are very prominent, extending backwards considerably 

 beyond the brain-case. The zygoma is rather slender, is 

 elongate, and but little expanded. The otic bulla? are very 

 large ; the paroccipital processes are directed backwards, at 

 an angle of 45°, and are rather elongate and acute ; they cap 

 the bulla? posteriorly. The lateral occipital crests bound a 

 fossa of the occipital region near the condyles. The occipital 

 surface is directed horizontally backwards above the foramen 

 magnum. This part of it, and its superior portion, are 

 divided by a median keel. 



The basioccipital is keeled on the middle line below. The 

 sphenoid is not keeled, and is concave, its borders descending 

 on the inner side of the bulla?. The pterygoid fossa is rather 

 narrow, and the hamular process is short. The posterior 

 border of the palate does not extend anterior to the posterior 

 edges of the last tubercular molar ; and its middle portion 

 projects backwards in a triangular process. The palatine 

 fossa for the inferior sectorial is shallow. The superior sur- 

 face of the postorbital region is roughened. 



The foramen infraorbitale exterius is rather large, and issues 

 above the anterior border of the sectorial tooth. The f. in- 

 cisiva are short, not extending posterior to the middle of the 

 canines. The f. palatina are opposite the posterior border of 

 the sectorial. The f. lachrymale is altogether within the 

 orbital border. The/! opticum is rather large. This species 

 is peculiar in having the ff. splieno-orbitale, rotundum, and 

 alisplienoidale anterius united into one large external orifice. 

 The alisphenoid canal is' larger in Cam's latrans, and its pos- 

 terior foramen small. The/! ovale is further removed from 

 the/! alisphenoidale than in the coyote, and is exterior to and 

 a little behind the/! carotideum. 



The nasal bones extend to above the middles of the orbits, 

 and contract gradually to their apex. Their combined an- 

 terior border is a regular concave ; and the lateral angles at 

 this point are produced outwards and forwards. The posterior 

 apex of the premaxillary bone is separated from the anterior 

 apex of the frontal by a short space. The maxillo-malar 

 suture is deeply notched in front below, and it extends upwards 

 to above the infraorbital foramen. A very narrow surface of 



