14 
the brain case. The zygoma is rather slender, is elongate, and 
but little expanded. The otic bulle are very large; the paroccipi- 
tal processes are directed backwards, at an angle of 45°, and are 
rather elongate and acute; they cap the bull posteriorly. The 
lateral occipital crests bound a fossa of the occipital region near 
the condyles. The occipital surface is directed horizontally back- 
wards above the foramen magnum. This part of it, and its supe- 
rior 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 bulle. 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 surface 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. incisiva 
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 fi 
opticum is rather large. This species is peculiar in having the 
Sf. f. spheno-orbitale, rotundum, and alisphenotdale anterius united 
into one large external orifice. The alisphenoid canal is larger in 
' Canis latrans, and its posterior foramen small. The /f. ovale is 
further removed from the /. alisphenoidale than in the coyote, and 
is exterior to and a little behind the f. carotideum. 
The nasal bones extend to above the middles of the orbits, and 
contract gradually to their apex. Their combined anterior border 
is a regular concave, and the lateral angles at this point are pro- 
duced oatwards and forwards. The posterior apex of the pre- 
maxillary 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 infra-orbital 
foramen. A very narrow surface of the lachrymal is exposed on 
the external surface. The pterygoid bone is distinct, and is nearly 
equally bounded by the sphenoid and palatine on the outer side 
The inferior suture of the orbito-sphenoid runs in a groove, which 
is deepest anteriorly. 
