64 



the upper aspect of the tail, and is as elevated over the loins as over 

 the chest. The tail is shorter in proportion in the present specimen; 

 the indentations Avhich margin the casque are less bold and decided, 

 and the casque itself is less produced posteriorly. The dorsal crest 

 is supported by only ten spinous processes. The colour is slate gray, 

 with a yellow abdominal line, but "without the orange and dark reti- 

 culated lines observed by Mr. Stutchbury in his specimen. 

 Length of head and body .... 3| inches. 



tail 2| 



" As the specimen described and figured by Mr. Stutchbury came from 

 the river Gaboon, Western Equinoctial Africa, and the specimen be- 

 longing to the Zoological Society from Fernando Po, it is possible that 

 they may be examples of permanent varieties ; but I am rather in- 

 clined to attribute the difference to age or sex, or to both combined. 

 Mr. Stutchbury's specimen is probably an adult male ; that belonging 

 to the Zoological Society is a young female. The Cham. Oweni, Graj' 

 (Cham, tricornis. Gray), differs from a specimen from Fernando Po, 

 (collected by Lieut. Allen) in the possession of the Society, only in 

 having the horns less developed. With respect to the species I regard 

 as undescribed, I beg to offer the following observations : — 



" At a first glance this Chameleon might be confounded with Cham. 

 Senegalensis, or with Cham, dilepas ; the grainlike scales of the body 

 and the general contour of the head and body being much alike in 

 each. When, however, we come to examine more closely, we shall 

 find sufficient reason to regard it as entirely distinct. Both in 

 Cham. Senegalensis and its immediate ally (if it be truly a separate 

 species), Cham, dilepas, the dorsal ridge and also the median line of 

 the throat and abdomen are strongly denticulate. In this, however, 

 neither the dorsal ridge, nor the abdominal or gular median line, 

 present any such character. In Cham. Senegalensis the tail is re- 

 markably stout at the base, the skin behind the knee-joint is close, 

 and there is a sort of heel, or angular projection (at least in the 

 specimens before me), at the posterior junction of the two portions 

 of the hind-foot. In the Chameleon which I regard as undescribed 

 the tail is slender at the base and long, the skin behind the knee- 

 joint is loose and fanlike, and there is no angular projection or 

 heel. 



" The granulations of the body, it may also be obsen'ed, are much 

 less acutely elevated (being smaller and rounder) than in Cham. 

 Senegalensis. 



" The casque between the eyes is comparatively narrower, being 

 there contracted ; it is broader and more rounded however posteriorly, 

 and is less produced. The middle line or keel is a little more dis- 

 tinct ; and between the eyes the casque is more deeply and abruptly 

 concave ; a very small flap or ear, which indeed might easily be over- 

 looked, is produced from the posterior part of the casque, and lies on 

 each side of the^neck, as in Cham, dilepas ; but as we have said, in 

 this species the dorsal ridge and the median line of the throat and 

 belly are strongly denticulate, or as Daudin said of its ally the 

 Cham. Senegalensis, ' denteUs en scie.' 



