I.J THE FROG. 6 1 



c The maxilla; on either side a long bone 

 bounding the greater part of the gape, and 

 abutting against 8. in front. Each maxilla 

 sends up an ascending process, which abuts 

 against the outer end of the nasal. 



£. The quadrato-jugal (jugal?); a delicate bone, on 

 either side, bounding the hinder third of the gape 

 and passing between the maxilla and squamosal. 



d. The base of the skull. 



a. The exoccipitals, pro-otics, pre-maxilla, maxillie, 

 and quadrato-jugals. Cf. supra. 



Note that each pre-maxilla sends back a short 

 palatine-process. 



/?. The parasphenoid; a dagger-shaped bone running 

 along the greater part of the floor of the cranial 

 cavity. 



y. The sphenethmoid or girdle-bone; a large bone 

 underlying the anterior portion of /?. and en- 

 closing the anterior third of the brain-case. 



8. The palatines; slender bones, one on each side, 

 passing out transversely from near the anterior 

 end of the parasphenoid to the body of the 

 maxilla. Each underlies the corresponding 

 nasal bone. 



e . The vomers; two broad irregular shaped bones, 

 immediately in front of 8. These, in common 

 with the maxillae and pre-maxillae, bear teeth. 

 (Cf. Sect. E.) 



£. The pterygoids ; large triradiate bones, one on 

 either side. Each abuts against the antero- 

 ventral border of the auditory-capsule internally; 



