40 THE SKELETON OF THE CAT. 
The lateral surface is continuous with the lateral surface of 
the frontal process and shows at the base of the frontal process 
on its caudal border the large infraorbital foramen (Fig. 
27, ¢), for the vessels and nerves of the same name. Near the 
medial end of the surface is a cylindrical elevation (@) for the 
root of the canine tooth (¢). 
The ventral surface is smooth and looks into the roof of the 
mouth. 
On the dorsal surface caudal and cranial halves may be dis- 
tinguished. The caudal one-half enters into the floor of the 
orbit. The lateral edge of this portion is divided into two 
laminz, between which is received the end of the malar bone. 
Caudad this edge is prolonged into the short dorsally directed 
zygomatic process (7). The cranial half of the dorsal surface 
looks into the nasal cavity and is separated from the caudal 
half by a sharp vertical lamina of bone which runs caudo- 
mediad from the base of the nasal process. To the dorsal edge 
of this lamina are articulated the lachrymal bone and a part of 
the palatine. At the point where the lamina joins the base of 
the nasal process a foramen is seen leading into a canal, the 
nasolachrymal canal (4). Craniad of the lamina the surface 
is concave. Where it becomes continuous with the inner edge 
of the frontal process there is attached to it a thin bone, the 
ventral nasal concha (or maxilloturbinal), which is rolled into 
an irregular spiral. The nasolachrymal canal opens ventrad 
of its cranial end. 
The cranial third of this part of the bone projects further 
mediad than does the rest of the medial border, forming thus 
the broad palatine process. This is rough on its medial edge 
for articulation with the premaxillary and the palatine process 
of the opposite bone. This medial edge rises also dorsally into 
a low ridge, the nasal crest (7), which is roughened for artic- 
ulation with the vomer. The caudal two-thirds of the medial 
edge articulates with the palatine bone. 
The cranial end of the bone articulates with the premaxilla. 
The caudal end is smooth. 
The frontal process (4) presents on its inner surface, which 
looks into the nasal cavity, certain transverse ridges which are 
