IJEPTILIA. 289 



Sirobilolepis nob., Trachysaunhs Gray, Dum. and Bibr. Scales 

 gibbous, or subcarinate, thick. Tail very short, depressed. Re- 

 maining characters nearly of genus Gyclodus. 



Sp. Cydodus pachyurus, Trachysaurus rugosus Gray, TracJiysaurus Peronii 

 Wagl., New Holland. 



TropidopJiorus Dumer. and Bibr. [Leposoma Cuv. not Spix, 

 Tropidosaurus Gray not BoiE.) Four feet pentadactylous, witli 

 toes unequal, subcompressed. Eyelids mobile. Maxillary teeth 

 cylindrical, palatine none. Tongue enmrginate, covered with scaly 

 papillae. Membrane of tympanum naked. Back flat with carinate 

 scales. Tail compressed. 



Sp. Tropkloplwrus cocinsinensis, Tropidosaurus montanus Gray, Dum. et 

 Bibr. Erpct. v. PI. 5 7, fig. i ; this species from Cochin China, discovered 

 by DiARD, from whence also the specimen in the Leyden Museum is 

 derived, differs by the tympanic membrane lying bare and also by its 

 general form, in a remarkable manner from the rest of the Seines. Cuvier 

 placed this genus with Agmna amongst the Iguano'ids. 



Family XVII. Zonosauri nob. s. PtycJioplQuroe WiEGM. 

 [Cyclosauri D(JM. and Bibr. in part). Tongue not extensile, flat, 

 oblongo-triangular, emarginate at the apex. Head scutate, flat 

 above, separated from the nape by a transverse groove. Scales 

 verticillate, in back mostly subquadrate, or rectangular. Feet 

 sometimes none or vestiges only of hinder. Eyelids mobile, dis- 

 tinct. (Femoral pores in many. A longitudinal fold on each side 

 of the abdomen in almost all.) 



A small family, of which some species were formerly placed 

 amongst the IguanoTds, whilst others which had no limbs or im- 

 perfect limbs, were arranged in the neighbourhood of Anguis and 

 Bipes, or united to them. The belt-like covering of scales dis- 

 tinguishes these lacertine animals from all the rest. 



This is the fittest place to say a few words on the pori femorales. In many 

 lizards on the inside of the thighs is found a row of tubercles with an 

 aperture into which the cuticle penetrates. In AmpMshcvna and Cldroles 

 we have already noticed the presence of similar apertures in front of the 

 vent. The scales in which these little pits are situated often differ some- 

 what in form from the neighbouring scales. Under each of them lies a 

 glandular body which terminates broad on a little pedicle turned towards 

 the outer surface and splits into some blind follicuU. The presence and 

 the mode of position of these pori femorales afford good generic characters; 

 but their number is not constant in each species, and even differs in some 

 VOL. II. 19 



