SKULL 



99 



M 



7\. SKULL OF"A YOUM; AXOLOTL 

 (.\ini>ly*stomQ). Ventral view. 



CoccOsp 



Fin. 7-i;. SKULL OF Salamandrajatra 

 (ADULT). Dorsal view. 



Cl 



FIG. 7'2c. SKULL OF .W^///'//" ntf.i (ADULT). Ventral view. 

 posterior part of " alisphenoid " region ; Bp, cartilaginous basal plate between 

 the auditory capsules ; Can, nasal cavity ; Cocc, occipital condyles ; /', 

 frontal ; Fl, foramen for the olfactory nerve ; Fov, fenestra ovalis, closed 

 on one side by the stapedial plate (St) ; IN, internasal plate, which extends 

 laterally to form processes (TF and AF) bounding the internal nostrils 

 (C'/t) ; Lyt, ligament between the stapes and suspensorium ; M, maxilla ; 

 N, nasal ; Na, external nostrils ; NK, nasal capsule ; OB, auditory capsule 

 and exoccipital ; On, orbitosphenoid ; Osp, tectum synoticum ; P, parietal ; 

 Pf, prefrontal, perforated ac D for the lacrymal duct ; PI, palatine ; Pmx, 

 premaxilla ; Pot, otic process, PED, pedicle, and Pa, ascending process of 

 the quadrate ; Pp, palatine process of maxilla ; PS parasphenoid ; Pt, bony 

 pterygoid ; Ptc, cartilaginous pterygoid ; Qu, quadrate ; Jit, point of entrance 

 nt the ophthalmic branch of the fifth nerve into the nasal capsule; Squ, 

 paraquadrate (" squamosal'') ; TV, trabecula ; To, vomer ; Vop, vomeropala- 

 tine ; Z, tongue-like outgrowth of the internasal plate, which forms a roof 

 for the internasal cavity ; II, optic, V, trigeminal, and VII, facial foramina. 



H 2 



