132 



IITSIIDiE. 



Cranial bones more or less solidly united ; fcranspalatine present ; 

 pterygoid extending to quadrate; supratemporal very small and 

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

 frontal in contact with nasal. Mandible with coronoid bone. 

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

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

 side of the vent. 



Pig. 8. 



^ so Do 



Skull of Ilysia scytak. 



This family forms a passage from the Boidce to the Uropeltidw, 

 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. 



Synopsis of the Genera. 

 PrremaxiUary 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 prsemaxillary teeth ; eye distinct from the surrounding shields • 

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



