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, c), 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 (e).. 



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 

 laminae, between which is received the end of the malar bone. 

 Caudad this edge is prolonged into the short dorsally directed 

 zygomatic process (j). 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 (k). 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 



o 



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 (;), 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 () presents on its inner surface, which 

 looks into the nasal cavity, certain transverse ridges which are 



