THE SKULL. 



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FIG. 63. SKULL OF YOUNG WATER-TORTOISE (Emys europcea). (Side view.) 



Osp, supraoccipital, which gives rise to a crest ; Pf, prefrontal, which forms a 

 great part of the anterior boundary of the orbit ; /, point of entrance of the 

 olfactory nerve into the nasal capsule ; Si, interorbital septum ; HK, horny 

 sheaths of jaws ; Qjg, quadratojugal ; Alt, tympanic membrane ; BP, carti- 

 laginous interval between basioecipital and basisphenoid ; Md, mandible. Other 

 letters as before. 



Cote 



FIG. 64. SKULL OF A YOUNG CROCODILE. (Ventral view j 



Cocc, occipital condyles ; Ob, basioecipital ; C'h, internal nostrils ; Pi, pterygoid : 

 Orb, orbit ; PI, palatine ; J/, palatine process of maxilla ; Pmx, premaxilla ; 

 Ts, transverse bone ; Jg, jugal ; Qj, quadratojugal ; Qu, quadrate. 



