104 



few irregular smaller shields. Back and limbs covered with very 

 small granules intermixed with numerous, irregularly arranged, 

 rounded conical tubercles. Throat with very small granules ; 

 abdominal scales moderate. Femoral pores in a long series, 

 forming a very open angle in the middle, 16 to 20 on each side. 

 Tail slightly depressed, distinctly annulate, covered above with 

 very small flat granular scales and transverse series of backwardly 

 directed conical tubercles, beneath with large, rather irregular 

 dilated scales ; each annulus is composed of 12 to 14 transverse 

 rows of scales above, 3 or 4 below. Brown or grey, spotted 

 with blackish, a double series of spots along the middle of the 

 back being constant ; tail with more or less marked darker and 

 lighter rings ; lower surfaces whitish. 



From snout to vent 3-25 inches; tail 4-16. 



Hob. Ceylon ; Malay Peninsula and Archipelago. 



Genus PTYCHOZOON, 

 (Kuhl), Fitzinger, N. Class. Rept. p. 13, 1826. 



Digits strongly dilated, entirely webbed, with undivided lamellae 

 below ; all but the thumb and inner toe with a compressed curved 

 distal phalanx with retractile claw, originating a little before the 

 extremity of the digital expansion. Limbs and sides of head, body 

 and tail with much developed membranous expansions acting as 

 parachutes. Upper surfaces covered with juxtaposed granular 

 scales and tubercles ; lower surfaces with small, slightly imbricated 

 scales ; the parachute-membrane of the side covered above with 

 imbricate square scales arranged like the bricks of a wall, scaleless 

 below. Pupil vertical. Males with praeanal pores. 



A single species. 



110. Ptychozoon homalocephalum. 



Lacerta homalocephala, Creveldt, Mag. Ges. Naturf. Fr. Berlin, iii, 



1809, p. 267, pi. viii. 

 Ptychozoon homalocephalum, Cantor 'J. A. S. B. xvi, 1847, p. 6:26; 



Giint/i. Rept. B. I. p. 105 ; Theob. Cat. p. 73 ; Bouleng. Cat. Liz. 



i, p. 190. 



Head oviform ; snout longer than distance from eye to ear- 

 opening, 1| diameter of orbit; forehead concave; ear-opening 

 rather large, subcircular. Body and limbs moderate, depressed ; 

 digits short, not very unequal, webbed to the tips ; the fore limbs 

 bordered on each side by a broad dermal expansion ; a similar 

 expansion bordering the tibia on each side, the femur posteriorly 

 only. The parachutes on the sides of the body nearly as broad as 

 the latter. Another dermal lobe on the side of the head, below 

 the ear-opening, from the angle of the mouth to the neck. Tail 

 elongate, depressed, the sides fringed with a series of rounded 



