130 SS SEN EEE: 
anterior point of the nares is fifteen and one-half inches, that from 
the posterior extremity of the nares to the rear line of the skull is 
twelve and five-eighths inches. The nares are about one and three- 
fourths inches in length with an extreme width of five-eighths inch. 
Behind the point of greatest width they narrow somewhat, and in 
front of this point they taper quite rapidly forward. In this region 
the outer wall is cut away, leaving the naris open laterally, as pre- 
viously described in connection with the nasal. The aspect of the 
nares is upward in the posterior part, forward and lateral in the 
anterior portion where the side wall is cut away. 
About midway between the frontal and the nares the nasals begin 
to be elevated and rise gradually to the rear point of the openings. 
From this point forward they begin to descend, very gently for about 
half the length of the nares, thence more abruptly to their presumable 
union with the premaxille, which continue the slope an inch or so 
farther, when it merges into the long, horizontal, upper line of the 
snout. 
Antorbital vacuity.—A short distance behind the nares lie the 
antorbital vacuities, large ovoid openings with their smaller ends 
posterior and their long axes directed obliquely backward, upward, 
and inward in direct line with the axes of the orbits. The length 
of the vacuity is three and one-half inches and the width two 
and one-fourth inches. Of the elements which form the margins 
of this fossa the maxilla is by far the most important, as it makes up 
the anterior part of the upper margin (just how much is not certainly 
known), all the anterior border, and the lower border to within one 
and one-fourth inches of the rear extremity. Here it meets the lach- 
rymal, which bone continues the rear margin and the posterior half 
of the upper. This leaves not more than one inch of the upper 
border into which the nasal enters. 
The anterior wall of the vacuity is steep, as is also the posterior 
part of the upper margin, but between these is a narrow depression in 
the skull, which seems to be natural and which extends obliquely 
forward and inward about half-way to the nares. Behind the vacuity 
is a broad, rather deep depression which extends backward an inch 
from the rear margin and then slopes upward rather steeply toward 
the anterior margin of the orbit. It drops the lower anterior part | 
