THE SKELETON. 



43 



lateral ethmoids (Fig. 18), the mesethmoid, and the cribri- 

 form plate. The ethmoturbinals are in the form of 

 scroll-like laminae which project forward from the trans- 

 verse cribriform plate into the nasal cavities. The portion 

 which appears externally in the mesal wall of the orbit 



oc 



FIG. 16. DORSAL, ASPECT OF THE CAT'S SKULL. 



ap, Anterior palatine foramen ; c, canine tooth ; co, coronal suture ; /, for- 

 amina in palatine bone, the lateral one is the posterior palatine and 

 the mesal one is the sphenopalatine ; fr, frontal; if, infraorbital fora- 

 men; in, interparietal ; Ic, lachrymal canal at the anterior border of 

 the lachrymal bone; Id, lambdoidal crest; ml, malar; mx, maxillary; 

 na, nasal; oc, occipital; p, vertical plate of the palatine; po, post- 

 orbital process of the frontal; pm, postorbital process of the malar; 

 par, parietal; px, premaxillary ; sq, squamosal part of the temporal; 

 sg, sagittal suture; sp, alisphenoid part of the sphenoid; tp, temporal 

 fossa; zg, zygomatic process of the squamosal. 



is the os planum. In the recent state, the surfaces of 

 these bones within the nasal cavity are covered with a 

 mucous membrane over which the first pair of cranial 

 nerves (olfactory) are distributed. The delicacy of the 

 sense of smell is proportional to the development of the 



