﻿44 



INTRODUCTION 



The deviation from the normal type is much 

 greater still when we consider the degraded, worm- 

 like members of the families Typhlopidse (Fig. 4, 

 p. 43) and Glauconiidae (Fig. 5), in which the skull is 

 very compact and the maxillary much reduced. In 



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Fig. 5 — Skull of Glauconia macvolepis. (From British Museum 

 Catalogue of Snakes) 



Lettering of the bones as in Fig. 3 



the former this bone is loosely attached to the lower 

 aspect of the cranium ; in the latter it borders the 

 mouth, and is suturally joined to the premaxillary 

 and the prefrontal. In both the tranverse bone and 

 the supratemporal are absent, but the coronoid ele- 

 ment is present in the mandible. 



