474 



THE VERTEBRATE SKELETON. 



much as a foot. This development of air cells is accompanied 

 by the obliteration of the sutures between the various bones. 

 The most noticeable point with regard to the cranial cavity 

 is the comparatively large size of the olfactory fossa. The 

 supra-occipital (figs. 96 and 97, 9) is large exceedingly large 

 in the adult skull ; the parietals (figs. 96 and 97, 2) are also 

 very large. The frontals send out small postorbital processes, 

 but these do not meet processes from the small jugal, which 



14 



-11 



ml 



FIG. 96. SKULL OF A YOUNG INDIAN ELEPHANT (Elephas indicus), SEEN 



FROM THE RIGHT SIDE, THE ROOTS OF THE TEETH HAVE BEEN EXPOSED. 



x . (Camb. Mus. ) 

 1. exoccipital. 



2. parietal. 



3. frontal. 



4. squamosal. 



5. jugal. 



6. premaxilla. 



7. maxilla. 



9. supra-occipital. 



13. basi-occipital. 



14. postorbital process of the 



frontal. 



15. lachrymal. 



16. pterygoid process of the ali- 



sphenoid. 

 i 1. incisor. 

 mm 3., mm 4. third and fourth 



milk molars. 

 m 1. first molar. 



