264 VARANIANS. 



shaped, i. e. slender, round, slightly incurved, and sharp-pointed : 

 about three lines in length above the alveolar border, close-set, and 

 equal sized. Their rounded base is anchylosed to the alveolar groove, 

 and their outer side attached to a well developed external alveolar 

 wall. I have proposed for the new genus of Lizard indicated by 

 these remains the name of Raphiosaurus. 



The following are the principal varieties which the existing Vara- 

 nians exhibit in the form of the teeth. 



The teeth of the Heloderm are slender, almost straight, sharp- 

 pointed, and with a deep fissure. 



In the monitor of the Nile (Varanus niloticus PI. 68, fig. 4) there 

 are four teeth in each intermaxillary and eleven in each maxillary bone : 

 in the lower jaw there are eleven teeth in each premandibular bone. 

 The posterior of these are obtuse tubercles in old specimens, but all the 

 other Fam/zi have trenchant teeth, often wdth dentated margins. The 

 teeth are always obliquely bevelled oflf at the root, which is lodged 

 in a common groove with the internal border slightly developed. 



In the land Monitor {Varanus arenarius) the teeth are of mode- 

 rate size, slightly compressed and a little curved backwards. 



In the Varanus Timoriensis there are about thirty teeth adhering 

 to the internal margin of the upper jaw and from twenty to twenty- 

 two in the lower jaw : they are well spaced, compressed, pointed, 

 slightly curved, trenchant but not dentate. 



The teeth of the Dracaena lizard of Shaw {Varanus bengalensis, d. 

 & B.), are neither trenchant nor dentate, but moderately compressed ; 

 short and strong, the anterior ones especially. There are thirty of 

 these teeth in the upper jaw and twenty-four in the lower jaw. 



The teeth of the double-banded Monitor {Varanus hivittatus) are 

 all much compressed, with finely dentate trenchant margins : except 

 the small intermaxillary teeth, which are conical, pointed and in- 

 curved. There are eight intermaxillary teeth, eleven maxillary teeth 

 on each side, and twelve teeth in each premandibular bone, where one 

 or two of the anterior teeth are conical, corresponding with the inter- 

 maxillaries above. 



The variegated lizard {Varanus variegatus) presents the most 

 compressed form of teeth : in specimens preserved in spirits they are 



