SNAKES. 27 



6. The Algerine Adder. Clotlio ? mauritaiiica. Echidna 

 mauritanica, Duvi. 4* Bih. Exped. Set. Alger. Hept. t. 3, no desc. 



Brown : back with larg-e, oval, nearly contiguous cross-bands ; 

 sides with a sinuous pale streak : head pale ; temporal streak sim- 

 ple, dark ; superciliary shields 3-3, simple. 



Inhab. Algiers. Mus. Paris. 



*** Nasal plate simple : eyehrovjs of males t* or both sexes with a 

 group of small horn-like scales over the eyes. 



7. The Horned Adder. Clotho cornuta. Vipera cornuta, 

 Daud. vi. 188. Schlegel, 582, t. 21, f S, 9. A. Smith, III. Z. S. 

 Afr. Rept. 32. V. Lophophrys, Cuvier, R.A. ii. 92, ed. 2, 4. Pater- 

 son, Trav. t. 15. A. Smith, III. Zool. S. A. Rept. t. 33. V. armata, 

 A. Smith, Edinh. Journ. i. 2. Gehorne Schlange, Lichst. Reise. 

 i. 153. Cerastes cornuta. Gray, Zool. Misc. 96. Cerastes ? cauda- 

 lis. Gray, Zool. Misc. 96. Vipera (Cerastes) caudalis, A. Smith, 

 Illust. Zool. S. Africa, Rept. t. 7. Vipera ocellata, A. Smith, 

 Mag. Nat. Hist. (1838), ii. 92, not Daud. 



Gray-brown, minutely and closely black-dotted ; back with four 

 series of irregular dark spots ; sides dark marbled ; scales rather 

 elongate, keeled to the rather acute tip : the first, second and third 

 lower labial shields high ; the rest moderate, nearly square. 



a. In spirits. Half grown. Cape of Good Hope. Presented by 

 Ford, Esq., 72nd Reg. From the Chatham Museum. 



h, c. In spirits. Adult and young. S. Africa, Cape of Good Hope. 

 Presented by the Earl of Derby. 



b. Nostrils small, sublateral, anterior. Cerastina. 

 3. Cerastes. 



Subcaudal plates two-rowed : nostrils lunate, in the hinder part 

 of a small nasal plate : superciliary shields very small, scale-like : 

 eyebrows of males often horned : scales keeled, broad, ovate, rounded 

 at the end, placed in oblique cross-series : keel not reaching the 

 tip. 



Cerastes, Wagler, Syst. Amph. 173, 1830. Gray, Zool. Misc. 

 96. Aspis sp., Lanr. Fitzinger. Cobra, Gray, Ann. Phil. 1825, 

 205. Cobra sp., Laur. 



D 2 



