SKULL 



99 



five 



Coee Osp 



72A. SKULL OF A YOUNG AXOLOTL Fie. 72s. SKULL OF Salxniandra atra 



(Aml>lytomu}. Ventral view. 



(ADULT). Dorsal view. 



-Can 



FIG. 72c. SKULL OF Salamandra ni ra (ADULT). Ventral view. 

 A--, posterior part of " alisphenoid ? ' region ; Bp, cartilaginous basal plate between 

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

 frontal ; Ft, foramen for the olfactory nerve ; For, fenestra ovalis, closed 

 on one side by the stapedial plate (St) ; /JV, interuasal plate, which extends 

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

 (Ch) ; ^L<jt, ligament between the stapes and suspensorium ; J/, maxilla ; 

 A r , nasal ; JVa, external nostrils ; JVA", nasal capsule ; OB, auditory capsule 

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

 Pf, pref rental, perforated ac D for the lacrymal duet ; PI, palatine ; Pmx, 

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

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

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

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

 paraquadrate ( " squamosal " ) ; Tr, trabecula ; Vo, vomer ; Vop, vomeropala- 

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

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



H 2 



