18 DR. J. ANDERSON ON MAMMALS, UEPTILES, [Jan. 5 



black margins of the scales on the nape tend to form longitudinal 

 luics. 



No. 1. Snout to vent 83 millim,, tail 60, hind limb 17. 

 No. 2. „ „ „ 83 „ „ 45S „ „ 17. 



This species is distinguished from 0. sepoides (Plate I. figs. A, 5) 

 by the nostril not being placed in advance of the suture between the first 

 labial and the rostral ; by the fifth labial entering the orbit, whereas 

 in C. sepoides it is the fourth that does so ; and by 28 rows of scales 

 round the body, whilst in that species these scales never exceed 24. 



The ear is much the same as in O. sepoides, but it is very different 

 from the ear of C. ocellatus and that of C mionecton, in which it is 

 a round well-marked opening, further removed from the angle of the 

 mouth. 



It is linked by the character of its labial edge and rostral to 

 C. sphenopsifonnis (Senegambia), wiiich through C. mionecton 

 connects it with G. ocellatus. It thus supplies a link that was 

 wanting in the chain of these species, so to speak. 



1 have nmch pleasure in connecting Mr. Boulenger's name with 

 this new lizard from Barbary. 



Suborder II. Rhiptoglossa. 



Family I. Ciiam^leontid^. 



Genus Cham<eleon, Laurenti. 

 1. CuAM^iLEON VULGARIS, Daudin ; Boulenger, Joe. cif. p. 142. 

 1, Tamernii, Sahara; 3, Duirat, Tunisia. 



Suborder III. p h i d i a. 

 Family I. Colubrid^. 

 Genus Zamenis, Wagler. 

 1. Zamenis algirus, Jan ; Boulenger, loc. cit. p. 147. 



2 specimens, Duirat, Tunisia. 



No. 1. Total length 1000 millim., tail 250. Ventrals 218, sub- 

 caudals 104. 



No. 2. Total length 920 millim., tail 200. Ventrals 231, sub- 

 caudals 87. 



In the first specimen there are 8 upper labials on one side and 9 

 on the other, but in No. 2 there are 9 upper labials on both sides. 

 In No. 1 the fifth labial enters the orbit on the left side, but on the 

 riglit side the labials are excluded from touching the eye ; and in 

 No. 2 a labial, the fifth, enters the orbit on one side only, being ex- 

 cluded on the other by an additional subocular, the labial entering the 

 orbit when there are only two suboculars. The preeocular in these 

 specimens has generally two small scales below it separating it from 



' Reiicvrcd. 



