10 
TKKTIAKY AliliTEJilJATA OF THE FAYOxM. 
r()u<>]ieiio(K 'I'he otlicr alveoli arc smaller, compressed from before backwards, 
and crowded tog-eLlier ; they are sei)aratcd by a very small space from the socket 
of i. 1 in front and by none at all from that of the canine behind, d'he palatine 
portion ol’ the ])remaxilla; is small : the |)remaxillo-maxil!ary suture runs backwards 
from immediately bcliind the alveolus of the last incisor, and the bones form little 
more of the ])alate than the high arched roof of the unpaired anterior ])alatine foramen, 
the posterior or ventral edge of which is formed by the anterior border of the palatine 
})lates of the maxillae. The facial portions of the premaxilhe I'orm the very narrow 
wedge-shaped extremity of the snout, the actual angle of which is somewhat 
ti'uncated and roughened. The suture with the maxilla (Pis. I., II., III.) runs upwards 
and backwards to a point midway between the nasal opening and the orbit; and in 
front of this the bone unites with the nasal, the suture with which runs just into the 
narial opening. Within the latter the premaxilla again meets the maxilla, forming a 
suture with the upward prolongation of that bone, which together with a downgrowth 
of the nasal forms a support for the large horns in the manner above described (see the 
description of the nasals and text-fig. 2). The posterior part of the border of the 
nasal opening formed by the premaxilla is rounded, but in front of this the bone is 
bent inwards and downwards and terminates internally in an irregular roughened 
edge, the posterior angle of which forms a blunt tuberosity. This inturned 
edge is separated from the corresponding portion of the bone of the opposite 
side by a deep groove (text-fig. 2, mes.g.), wliich in life probably lodged the lower 
edge of a vertical cartilaginous nasal septum. In the young this remains unossified, 
but in the fully adult animal its anterior region ossifies and forms the prenasal bar 
of bone joining the nasals with the premaxillse, as above described (see Pis. I., II. 
fig. 1 a; also text-fig. 2). 
In consequence of the great size and the hypsodonty of the teeth, the mad'iUd {inx.) 
is very large. Its facial suture with the premaxilla has already been described, 
and it will be noticed that it is completely excluded from the margin of the 
nasal opening by the meeting of the premaxilla and the nasal. ^Vithin the 
nasal opening, however, it is produced upwards into a process which unites 
with a downgrowth of the nasal in the manner already mentioned. Pehind its 
union with the premaxilla the upper border of the bone meets the frontal, and 
its suture with that bone terminates just behind the mitorhital foramen [a.of.), at 
which point the small lachrymal is inteigiosed, and helps to form tlu' outer 
side of the bar of bone which closes the antorbital foramen externally. 
This foramen is very large and opens by a wide passage into the orbit. The 
maxilla is excluded from the actual margin of the orbit by the junction of the 
lachrymal with the upper end of the jugal, which sends iqi a long jirocess 
forming the whole ventral border of the orhit, and uniting anteriorly with the 
maxilla. The zygomatic process of the maxilla is very short, extending very little 
