196 Mr. Gray on the Genera of Reptiles, [Sept. 



mander; but the genus has been properly rejected by all latter 

 zoologists. 



1. communis, Kanig. 



2. Saurocephalus. Harlan, 1824. 

 Teeth in separate sockets. 



S Harlan, 



Fam.Wl, Plesiosauuid.t:. 



Feet paddle- shaped; toes five; cervical vertebra 35 or 41. 

 Marine. 



1. Plesiosaurus, Conyheare, 

 P. dolichodeirus, Conybeare. 



. Cuvier has described a genus of large lizard fossil under the 

 name of Geosaurus, Oss. Fas. v. ii. 328, which he says is inter- 

 mediate between the monitors and crocodiles. 



The genus Megalosaurus of Bucklandy GeoL Trans, is, per- 

 haps, allied to this order. 



Order II. Sauri, Blainv. 



Drum of the ears naked, or covered with the skin; anus 



transverse ; body covered with large and small imbedded scales ; 



legs four, toes 5, before and behind ; sternum short ; clavicles 



distinct; lungs extended into the abdomen ; living mostly on land. 



§ 1 . Toncrue not extensile. Ascolabata, Merrem. 



Fam. I. J;5TELLioNiDiE. StelHoncs, Cuvier. 



Toes free ; inequal ; body subcompressed ; throat subpendu- 

 lous, extensile. 



The throat of all, but more especially of the species of the 

 latter section of this family, are more or less capable of being 

 dilated by the processes of the os hyoides, as noticed by Baron 

 Cuvier in his Essay on the Osteology of Lizards (Ossment Fos- 

 siles, v. ii. p. ^81); and it has lately been described and figured 

 in an excellent paper by Mr. Bell, in the Zoological Journal, as 

 existing in the genu« Anolius. 



'\ Without any teeth in the throat; teeth equal, conical ; toes 

 simple. Agamina, Gray. Stellionida?, Bell, without character. 



Gen.\. Uromastrix, Merrem. 



Body and head scaly; tail with large whirled pointed scales; 

 femoral pores distinct. 



U. Richii, Gray. U. acanthinurus. Bell, not U. Anthurus, 

 Merrem. Common Africa. 



2. Zonurus, Merren. Cordylus, Gronovias. 



Body scaly ; head and abdomen shielded ; tail Vvhorled ; 

 spinose ; femoral pores distinct. 



Z. Cordylis, Merren. L. Cordylus, Lin, 



