44 



INTRODUCTION 



The deviation from the normal type is much 

 greater still when we consider the degraded, worm- 

 like members of the families Typhlopidae (Fig. 4, 

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

 very compact and the maxillary much reduced. In 



pro 



60 Ho 



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. 



