THE TYPICAL BONY SKULL. 



25 



segments of wliicli the basisplienoid and presplienoid form the 

 basal parts, are membrane bones, and are disposed in twa 

 pairs. The posterior are the parietals^ the anterior the fron- 

 tills y and the segments which they complete are respectively 



o 



I 



Brancliial apparatus. 



Ilyoidean apparatus. 



o 



I— I 



M.andibu]ar Suspensorium. 



o 



W 



02 



Ah 



o 



<1 



o 



o 



B 



p 



1^ 

 •-a 



Ah 



<1 





Hi 



o 



3 



H 



.=§ 



