ILTSIID.15. 



249 



Family IV. ILYSIID^. 



Cranial boues solidly uuifed ; trauspalatiue present ; pterygoids 

 extending to quadrate ; supratemporal Aery small and wedged in 

 between the adjacent bones ; quadrate \ery short ; pra^t'rontals 

 forming a suture with nasals. Mandible with eoronoid bone. 

 Teeth in jaws and on palate. Vestiges of pelvis, formed of three 

 or four elements, as in the 7?o/''/t'', and terminating in a claw-like 

 spur usually distinguishable on each side of the xent. 



This family forms a passage from the Boulo to the Uropdtida-, 

 agreeing with the latter in the physiognomy and sciiling, with 

 the former in the presence of vestiges of pelvis, whilst the slaiU 

 is exactly intermediate. 



Only two genera are known, the South-American Ihjmi and 

 the East-Indian Cyllndroplds. 



jjirv 



ar. Articular. 



bo. Basioccipital. 



cor. Corunoid. 



(/. Deutarv. 



CO. Exoccipital. 



/'. Frontal. 



Fig. 77. — Skull of Cyliiuhophis nifua. 



m. Maxillary. pt. Pterygoid. 



)i. Nasal. q. Quadrate. 



2). Parietal. ,so. Supraoccipital. 



jnn. PraMiiaxillary. xt. Snpratemporal. 



prf. Pra'f'routal. tp. Transjialatiiic. 

 pro. Prootic. 



Genus CYLINDROPHIS, 



Wagler, loon. Amph., 1828. 



Teeth moderate, subequal, 10 to 12 in each maxillary ; none in 

 praemaxillary. Head not distinct from neck ; eye very small, w ith 

 round or Ai^rtically subelliptical pupil, distinct from the neighbouring- 

 shields ; a mental groove ; head with large symmetrical shields * ; 



* For tliP terms applied to the shields of the head, see fig. 87, p. 278. 



