282 Mr. Gray on the Slender-tongued Saurian*. 



8, Uneata, and 8. leiocerca Bhortly, and of S.pulchella, S. punctu- 

 lata, ami 8. tabulosa scarcely fringed. 



Mi: holes, Gray. Nostrils horizontal, marginal, between two 

 scales ; the Lower one placed over the first and second Labial shield, 

 and with a small triangular scale at its hinder edge ; pneanal shields 

 numerous; central ones in a longitudinal series; abdominal shields 

 rhombic; toes fringed on the outer side; dorsal scales small, rhom- 

 bic, keeled; abdominal plates 12 or 14-rowed. 

 * Interparietal plate large. 



Meroles Knoxii. Lacerta Knoxii. Echo. Ann. Set. Nat. t. G. f. 8. 



Inhab. S. Africa, Cape of Good Hope. 



* * " Interparietal plate rudimentary ." 



Meroles Dumerilii. Lacerta Dumerilii. Ediv. Ann. Sci. Nat. 



Inhab. Senegal. 



C. Collar none, with a small axillary plait on each side, sometimes 

 obsolete. Dorsal scales lanceolate, keeled. Nostrils superior subapical. 



Mesalina, Gray. Nostrils marginal, convex, in the centre of 

 three small unequal nasal scales, placed over the first labial plate ; 

 loreal shields 2, first linear, hinder triangular ; scales of back small, 

 convex ; ventral shields subrhombic, 2 central series narrower ; prse- 

 anal shield single, surrounded by a series of 4 or 6 small ones, and 

 then some smaller scales ; toes slender, nearly simple ; claws long. 



Mesalina Lichtensteinii. Olive, beneath whitish ; abdominal shields 

 8-rowed; scales of the back ovate, rhombic, convex, smooth; of the 

 tail rhombic, elongate, slightly keeled. 



Inhab. N. Africa ? 



D. Collar indistinct, united to the chest in the middle, with a dis- 

 tinct plait before each shoulder ; dorsal scales rhombic, keeled. 



Cab rita. Nostrils in a horizontal suture, between two small 

 nasal shields, having a smaller one behind them. Collar adnate in 

 the middle, free on the sides ; prreanal shield single, surrounded by 

 five small shields in front; scales of the back rhombic, keeled. 



Cabrita brunnea. Ventral shields 6-rowed, central ones narrowed 

 on each side ; middle of the back bay ; sides dark brown, with two 

 rather wider white streaks on each side ; tail and limbs pale brown, 

 beneath silvery. 



Inhab. . Collection of Thomas Bell. Esq. 



Algira, Cuv. Psammuris, Wagler. Nostrils small in the hori- 

 zontal suture, between two nasal scales, which have two others at 

 their hinder side, so that it appears nearly in the centre of four small 

 shields ; ventral shields six-sided ; scales of the back broad, rhombic, 



