242 



THE ANATOMY OF VERTEBKATED ANIMALS. 



Fig. 82), there is a laohrymo-nasal fossa, or interval unoccupied 

 by bone, between the nasal, lachrymal, and maxillary bones, 

 such as exists in some Teleosawia, JDinosauria, and Ptero- 

 saur ia. 



The posterior nares lie between the palatines and the 

 vomer; and the nasal passage is never separated from the 

 cavity of the mouth by the union of palatine plates of the 

 palatine or pterygoid bones. 



The Eustachian tubes generally traverse the basisphenoid, 

 and ha\'e a common aperture upon the middle of the under 

 sui-face of the skull. 



F "3 S2 — ^T.aTeral, upper, and under views of the skull of a common Fowl {Phasianus gal 

 lu^Y vixp., the niaxlllo-palatine process. <2^. , the quadrate bone. The dotted lint 

 Acctdentaily stops at the angular process of the mandible. 



The bones of the brain-case, and most of those of the face, 

 rery early become ancbylosed together into an indistinguish- 



