132 



ILYSlIUiE. 



Cranial bones more or less solidly united ; transpalatiae present ; 

 pterygoid extending to quadrate; supratemporal very small and 

 wedged in between the adjacent bones ; quadrate very short ; prae- 

 frontal in contact with nasal. Mandible with coronoid bone. 

 Teeth in jaws and on palate. Vestiges of pelvis as in the Boidrp, 

 and terminating in a claw-like spur usually distinguishable on each 



side of the vent. 



Fig. 8. 



:^y -P^o 



Skull of Ilysia scytale. 



This family forms a passage from the Boidxv to the Uroj^eltidie, 

 agreeing with the latter in the physiognomy and scaling, with the 

 former in the presence of vestiges of pelvis, whilst the skull is 

 exactly intermediate. 



Ceylon and South-eastern Asia ; Tropical South America. 



Si/nopsis of tliG Genera. 



Pra^maxillary teeth ; eye in an ocular shield ; no mental groove. 



1. Ilysia, p. 133. 



No prsemaxillary teeth ; eye distinct fron the surrounding shields ; 



no mental groove 2. Anomalochilus, p. 134. 



No pra^maxillary teeth ; eye distinct from the surrounding shields ; 



a mental groove \ 3. Cylindrophis, p. 134. 



