SNAKES. 



21 



found in the southern parts of England, and the Common or 

 Ringed Snake [Tropidonoius natrix). The Tree- or Whip- 



Skull of Common Snake ( Tropidonotus natrix). 



ail. Angular. 

 ar. Articular. 

 bo. Basioccipital. 

 fis. Basisphenoid. 

 ca. Columella auris. 

 a. Dentarj. 

 eo. Exoccipital. 

 epq. Ectopterygoid. 



./, Frontal. 



m. Maxillary. 



n. Nasal. 



p. Parietal. 



pi. Palatine. 



pm. Pra^maxillary. 



prf. Prajfrontal. 



pro. Prootic. 



pff. Pterygoid. 



pff. Posttrontal. 



q. Quadrate. 



so. Supraoccipital. 



sfe. Supratemporal. 



V. Vomer. 



Snakes are exceedingly slender and elongate, and some are 

 exquisitely coloured, green being the predominant hue. They 



