46 THE SKELETON OF THE CAT. 



The perpendicular or nasal portion (Fig. 33, b} of the 

 palatine is thin and irregularly quadrilateral in form. It is 

 attached by its cranial two-thirds to the dorsal surface of the 

 horizontal portion. The outer surface is concave and looks 

 into the orbital fossa. The inner surface is convex and looks 

 into the nasal cavity. 



The perpendicular portion is marked by two formaina just 

 craniad of the middle. The larger dorsal oval foramen is the 

 sphenopalatine foramen (e]. The smaller ventral foramen is 

 the caudal opening of the posterior palatine canal (/"). From 

 this opening the canal passes craniomediad, lying in the sub- 

 stance of the palatine bone; it opens on the ventral surface of 

 the horizontal portion at the small openings previously 

 described (Fig. 41, q]. 



By its cranial margin it articulates with the lachrymal bone. 

 By its dorsal margin it articulates craniad with the orbital plate 

 of the frontal : with the lamina papyracea at its middle, and 

 with the body of the presphenoid caudad. The caudal half of 

 the dorsal margin is partially divided into two lamellae with a 

 rough surface between them : this rough surface lies against 

 the ventral surface of the presphenoid. The caudal margin 

 articulates with the pterygoid portion of the sphenoid. 



Lachrymal Bone. Os lachrymale (Fig. 34; Fig. 39, 10). 

 The lachrymal bone is a thin pentagonal scale of bone filling 



FIG. 34. LACHRYMAL BONE OF FIG. 35. MALAR BONE OF RIGHT SIDE, 



LEFT SIDE, EXTERNAL SURFACE. LATERAL SURFACE. 



Fig. 34. a, notch forming the beginning of the lachrymal canal. 

 Fig. 35. 0, ridge for origin of the masseter muscle; b, frontal process; c, zygo- 

 matic process. 



the interval between the horizontal plate of the palatine, the 

 maxillary, and the orbital plate of the frontal. Its outer surface 

 looks into the orbit, its inner surface into the nasal cavity. 



