86 EEPTILES. 



^ate, subcylindrical, the latter tapering: at the end. Legs 4, wealc, 

 far apart. Toes 4-5, compressed, front very short, hinder unequal. 



Kurk's Ristella. Ristella Rurkii, Gray^ Ann. N. H. ii. 333. 



CrovtTi and hack pale hrown, shinino- ; scales 6-rowed, each of 

 those in the 4 central rows with a black central spot, forminp: 4 

 longitudinal series of spots; sides ashy, while- dotted : chin and 

 belly white ; tail similar, but rather paler, nearly as long as the 

 body. 



Inhab. N. India, Dr. Rurk. Mus. Fort Pitt, Chatham. 



10. Tetradactylus, Peron. Seps, Fitz., Weigm. 



Head subquadrangular. Nasal plates lateral, nearly contigu- 

 ous, supranasals none, frontoparietal ? Tongue flat, scaly, 



nicked at the tip. Teeth conical, simple. Palate toothless, slight- 

 ly notched behind. Ears distinct, partly covered by the scales in 

 Iront of it. Occipital plates none. Lower eyelid with a transpa- 

 rent disk. Body elongate, cylindrical, sides rounded. Scales 

 smooth. Legs 4, far apart, weak. Toes 4-4, subcylindrical, sim- 

 ple, unequal, clawed, the first to the third gradually longer, fourth 

 short, low down. Tail elongate, conical, pointed, with a central 

 series of rather broader scales beneath. The 2 central preanal 

 scales largest. 



This genus differs from Chiamela in having no supranasal, and 

 in having a distinct external thumb-like toe to the hind foot. 



The Tetradactylus. Tetradactylus Decresiensis, Peron, 

 Mus. Paris. Cuv. R. A. ii. 64. Gray, Ann. N. H. ii. 333. Zool. 

 Erebus and Terror, Rept. t. Dum. et Bib. E. G. v. 764. Diet. 

 Sci. Nat. Add. t.f. 3. Seps Peronii, Fiiz. 52. Chiamela Du- 

 vaucellii. Gray, Ann. N. H. ii. 333. 



Dark brown, with series of black spots, the central series the 

 broadest ; scales of the under side pale edged. 



a. Adult, in spirits. Kangaroo Island. From the Paris Museum. 



11. Hemiergis, Wagler. Tridactylus, Peron, not Xacf/?. 

 Zygnis, part, Fitzinger. Seps, part, Cuvier. 



Head conical. Nasals lateral, large, rhombic, nearly contigu- 

 ous, supranasals none, 2 frontoparietals and interparietal similar 

 in size. Lower eyelid with a transparent disk. Tongue scaly, 

 nicked. Teeth simple, conical. Palate toothless, slightly notched 

 behind. Ears exposed. Body elongate, cylindrical, sides round- 

 ed. Scales smooth. Limbs 4, far apart, weak. Toes 3-3, simple, 

 subcylindrical, clawed, the middle one rather longest, the inner 

 shortest. Tail conical, pointed, with a central series of very broad 

 scales beneath. The 2 central preanal scales rather larger. 



