THE SKULL 



Eustachian aperture. With the exception of certain small regions 

 (fenestrse) on the dorsal side, the skull of Aniu-a forms a com- 



K ■\fc''.-!;5*#.i44, ^ 



'■^^^ Socc 



Fn:. 6S. — Restoeation of the Skull of a Stegocephalax (from the 

 Carboniferous of Bohemia). (After Fritsch.) 



Pmx, premaxilla ; J/, maxilla ; X, nasal ; Xn, nostril ; -?', frontal ; Pf, prefrontal ; 

 P, parietal ; Fp, parietal foramen ; Socc, supraoccipital ; Br, branchial 

 apparatus : Oc, sclerotic ring (orbital bones. ) ] 



plete cartilaginous box, the ethmoid region being at first entirely 

 cartilaginous, and later becoming ossified by a sphenethmoid, which 



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69.— Skvll of Pana i^cidtnta. Ventral view. (After Eoker. ) 



The investing bones are removed on the right side. 



Core occipital condyles : Olat, exoccipital ; OK, auditory capsule ; Qu, quadrate ; 

 ";./. quadratojugal : Pro, prootic ; Ps parasphenoid : A.^, alisphenoid region ; 

 pi bonv pterygoid ; PP, palatopterygoid ; i'P, frontoparietal ; E, spheneth- 

 moid tfirdle bone) ; Pal, palatine ; Vo, vomer ; J/, maxilla ; Pmx, premaxilla ; 

 V yf cartilages in connection with the nasal capsules ; Tr..Sr, prorhmal 

 cartila<ie ; //, f", VI, foramina for optic, trigeminal, and abducent nerves. 



