392 Mr. Gray on the Slender-tongued Saurians. 



keeled scales, placed in rings alternating with each other. Belly and 

 neck with flat shields ; collar double ; ears none ; femoral pores none. 



Heterodactylus, Spix. Chirocolus, Wagler. Toes 4 — 5, hinder 

 long, very unequal. 



Heterodactylus imbricatus, Spix. Braz. t. 2?. f. 1. (not good). 



Brazil. Mus. Zoological Society. 



Fam. VI. ChamjESAurid^e. 



Body sub cylindrical, elongate, the whole, except the head, covered 

 with rings of elongate keeled scales, forming longitudinal series ; 

 limbs rudimentary, ears distinct. 



Chamjesaura, Fitz. Feet fin-shaped; nostrilsin the lower hinder 

 edge of the nasal shield. Back with six series of broad, and belly 

 and sides with many narrow long keeled scales. 



Chamcesaura anguina. Lacerta anguina, Linn. Lac. monodactylus, 

 Lacep. Ann. Mus. Hist. Nat. ii. t. 59. f. 1. 



South Africa. Cape of Good Hope. 



Fam. VII. Helodermid.e. 



The back and sides with oblong convex shield-like scales, the 

 belly with flat, thin, square plates ; the head depressed ; muzzle 

 rounded ; teeth on the inner side of the jaws incurved, with an in- 

 ternal lateral groove ; supraorbital plate thin ; femoral pores none ; 

 tongue ? Legs 4, strong, 



Heloderma, Wiegm. Tr achy derma Wiegm. Isis, 1829. 



Heloderma horridum, Wiegm. Herp. Mex. 1. 1 . Trachyderma hor- 

 ridum, Wagler Icon. t. 18. 



Mexico. Mus. Brit. 



D. (Thecaglossce) . Tongue elongate, slender, retractile, apex fili- 

 form horny ; head with minute polygonal shields ; scales placed in 

 rings, those of the sides like those of the back ; thighs poreless ; su- 

 praorbital plates horny ; teeth adnate to the inner side of the jaws. 

 Old World. Near water. 



Fam. VIII. MoNiTORiDiE. 



Psammosaurus, Fitz. Nostrils oval, oblique, near the orbits ; tail 

 roundish ; scales not pierced ; toes rather long. 



Psam. Scincus. Lacerta Scincus. Uaranus Scincus, Merrem. Tu- 

 pinambus griseus and T. Niloticus, Daud. Monitor terrestre, Cuv. 

 Ouran de Forskal, Geoffr. Rept. Egypt, t. 3. f. 2. t. 4. f. 14, 15. 

 Young. — Inner side of the neck with 4 brown stripes ; tail banded. 



North Africa. India. 



Monitor. Polydcedalus, Wagler. Uaranus, Fitz. Nostril ob- 



