Acanfhodactylus. 49 



Measurements (in millimetres) : 



S- 6- ?• ?. 



From end of snout to vent . .90 61 94 80 



fore limb . 81 28 32 28 



Length of head . . .21 18 22 18 



Width of head .... 15 13 1(3 13 



Depth of head . . . .13 11 13 11 



Fore limh 32 27 30 27 



Hind limb 57 44 54 43 



Foot 28 23 27 21 



Tail 165 127 155 115 



The largest Acanthoclacfylus after A. grandis. 



Habitat. — Littoral near Tunis. 



Var. LINEOMACULATUS, D. & B. 



Head often a little more elongate than in the preceding forms, 1 J to 

 1| times as long as broad ; foot usually a little longer, up to If times 

 the length of the head. Tail li to 2 times as long as head and body. 

 Suture between the nasals J to -i, rarely |, the length of the fronto- 

 nasal, which may be nearly as long as broad and is often divided into 

 two by a longitudinal cleft "'■ ; very frequently one or two azygos 

 shields between the prefrontals t ; parietals sometimes a little longer 

 than broad ; anterior supraocular sometimes a little shorter than its 

 distance from the posterior loreal ; often 2 or 3 series of granules 

 between the supraoculars and the superciliaries, which are 5 or 6 in 

 number; subocular very rarely reaching the oral border,!}: wedged 

 in between the fourth and fifth or fifth and sixth upper labials; 

 temporal scales often distinctly keeled; 4 or 5 scales often form a 

 feeble but very distinct denticulation in front of the tympanum. 

 Gular fold sometimes very distinct. § Dorsal scales rhombic, flat 

 and subimbricate, with strong and sharply defined keels, from the 

 nape or from between the shoulders, often passing gradually into the 

 caudals ; sometimes a band of enlarged scales on each side of the 

 posterior part of the back, proceeding from the basal caudals. 



* In 8 out of the 26 specimens before me ; in 67 p. c. of the specimens from 

 Casablanca described by Boettger. 



t One in 13 specimens, two in 4; one in 27 p. c. and two in 59 p. c. of 

 Boettger's Casablanca specimens. 



t Only once, and on one side onlj% in tlie specimens before me. In my 

 description of 38 specimens from Tangier, in 1878, I stated this condition to 

 be exceptional. 



§ Especially in one specimen from Mogador. 

 VOL. II. 4 



