vni EMBKYONIC ADAPTATIONS IN EEPTILES 483 



(1) the mere retention of the egg within the uterus, the shell 

 still remaining and no intimate relations being developed between 

 foetal and maternal tissues (Anguis, Vipera, Coronella), 



(2) the rupture at an early stage and eventual disappearance of 

 the shell, and the coming into intimate relations of foetal and 

 maternal tissues, both becoming highly vascular and there being an 

 attempt at the formation of a yolk-sac placenta (Ghalcides ocellatus), 



and (3) the development of an allantoic placenta (C. tridactylus). 



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