S8i 



Fig. 200. — Skull of Grass Snake. (From W. K. Parker). 



A. Dorsal surface— /x., premaxilla ; ?;?,r., maxilla ; an.^ external 

 nostril; ?;., nasal; oL^ nasal cartilages;//;, prefronto-lachrymal ; /., 

 parietal ; /I, frontal ;/«., palatine ; t.^a., trans-palatine ;/^f., pterygoid ; 

 />ro.y pro-otic; ^/., epiotic : op., opisthotic ; so., supra-occipital; eo., 

 ex-occipital; ai-., articular; s.ag., sur-angular ; a^., angular; d., 

 dentary ; q., quadrate; sq., squamosal; B. Ventral surface^/^-., pre- 

 maxilla ; oi., nasal cartilage ; ;«.r., maxilla ; ?'., vomer ; /?a., palatine ; 

 /., parasphenoid ; /., frontal; />g:, pterygoid; bs.., basisphenoid ; 

 a/i'., alisphenoid ; b.o.., basi-occipital ; (Jc.t:., occipital condyle ; (?f., ex- 

 occipital ; q., quadrate ; ar., articiilar ; ag., angular ; s.ag., sur-angular ; 

 cr., coronary ; .f/., splenial ; d., dentary ; o/>., opisthotic region. 



