PARTS OF A SKULL 



307 



Parts of a Skull 



A skull is composed of a number of bones. The size and shape of these 

 bones vary more or less with different species, and they therefore form good 

 characters for distinguishing species and groups. The sutures indicating the 

 lines of junction between adjacent bones anchylose m.ore or less in aged ani- 

 mals and become obscure. Below are the names of the principal! parts of a 

 skull, with figures corresponding to those on the plate opposite. 



Skulls Nos. 1738 and 2087 are Southern California Skunks. Nos. 696, 

 2312 and 2332 are Columbia Gray Squirrels. 



Incisor. 



Canine. 



Premolar. 



Molar. 



Condyle. 



Coronal Process. 



Angular Process. 



Zygomatic Arch. 



Anteorbital Foramen. (The 



figure shows the location 



the orifice.) 

 Nasal. 



Premaxillary. 

 Maxillary. 

 Frontal. 

 Parietal. 

 Interparietal. 

 Postorbital Process. 

 Malar. 



Audital Bulla. 

 Palate. 



