242 



THE ANATOMY OF YERTEBRATED ANIMALS. 



Pig. 82), tliere is a laclirymo-nasal fossa, or interval unoccupied 

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

 such as exists in some Teleosauria, JDiiiosauria, and Ptero- 

 sauria. 



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 have a common ajDerture upon the middle of the under 

 Bui^face of the skull. 



-J''ntx. 



'inisB. 



TTtSCp, 



TTtSC.-i 



JPt: 



F77 



Fa 



Ha. 82. — ^Lareral, upper, and under views of the skull of a common Fowl {rhasianns gal 

 Iuh\ mxp.^ the maxillo-palatine process. (2«., the quadrate bone. The dotted liiM 

 accidentally stops at the angular process of the mandible. 



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

 very early become anchylosed together into an indistinguish- 



