130 SAURIA. 



those on the sides very large, irregularly shaped and arranged, intermixed with numerous 

 smaller scales similar to those on the back ; ventral scales small, smooth, or slightly keeled ; 

 praeanal region covered with very small scales. Tail long, thin, tapering, compressed at the 

 root, covered above with smooth rhombic scales, below with keeled ones which are more 

 elongate. Limbs rather long, the hind limbs extending on to the cleft of the mouth, if laid 

 forwards. Dark green, with dark-brown cross bands across the back, tail, and limbs ; gene- 

 rally a whitish streak behind the orbit. 



The horn on the snout is more developed in the adult males than in the females and in 

 the young ; it is half an inch long in the former, whilst it is reduced to half that length in 

 the females, and even to a still smaller size in the young. This proves that it is an orna- 

 ment, analogous to the appendages in gallinaceous birds, or to the horns of the Cervidoe, and 

 that it is not for the purpose of facilitating the discovery of food among decayed wood, as 

 has been supposed. It is a modified, flexible, pointed scale, usually white, but assuming a 

 purplish colour, like the scales on the throat and lips, when the animal is excited. This 

 lizard lives in the elevated parts of the island. 



Figure F of Plate XIII. represents the head of an adult male, F' of an adult female, 

 and F" of an immature male. 



Ceratophora texnentii. 



Ceratophora tennentii, Giinth. in Tennent, Nat. Hist. Ceyl. p. 281 (with a woodcut) . 



Head covered with very small, irregular shields; the appendage on the nose is fleshy, 

 compressed, subovate, covered with very small transverse scales; labial shields numerous; 

 throat with longitudinal series of quadrangular scales, and without a developed gular sac ; 

 the lower eyelid is scaly ; nostril small, lateral. Nuchal crest very low ; scales on the back 

 smooth, and much smaller than those on the sides, which are arranged in regular oblique 

 series, all being of equal size ; ventral scales small, keeled ; preeanal region covered with 

 very small scales. Tail long, thin, tapering, with smooth rhombic scales above and with 

 keeled ones below. Limbs long, the hind limbs extending on to the eye, if laid forwards. 

 Green, irregularly marbled with brownish. The young has well-defined markings : a brown 

 band between the eyes ; an oblique band from the eye to the angle of the mouth ; a light 

 band along each side of the back, with a vertebral series of dark-brown spots. 



This species is likewise an inhabitant of Ceylon, but appears to be a very local species, 

 as Ave have received it only in two collections. I have named it after Sir J. E. Tennent. 

 Both the adult specimens which I have examined* are males, 10^ inches long, the tail 



* Sir J. E. Tennent mentions that the typical specimens were sent by Dr. Kelaart from Ceylon ; 

 Kelaart certainly would not have left such a remarkable lizard undescribed if he had known it. These 

 specimens were selected by myself for the British Museum from collections sent by Sir. Thwaites to 

 Mr. Cuming, 



