As usually observed it is of a dull greenish brown, but when excited its back becomes a rich olive green, leaving the head yellowish: the underside of the body is of a very pale blue, almost approaching white. The open mouth exhibits the fauces of an intense vermilion tint; so that, although extremely handsome, this lizard presents, from its extraordinarily shaped head and threatening gestures, a most malignant aspect. It is, however, perfectly harmless. _Chameleon_.--The true chameleon[1] is found, but not in great numbers, in the dry districts to the north of Ceylon, where it frequents the trees, in slow pursuit of its insect prey; but compensated for the sluggishness of its other movements, by the electric rapidity of its extensible tongue. Apparently sluggish in its general habits, the chameleon rests motionless on a branch, from which its varied hues render it scarcely distinguishable in colour; and there patiently awaits the approach of the insects on which it feeds. Instantly on their appearance its wonderful tongue comes into play. [Footnote 1: Chameleo vulgaris, _Daud_.] [Illustration: TONGUE OF CHAMELEON.] Though ordinarily concealed, it is capable of protrusion till it exceeds in length the whole body of the creature. No sooner does an incautious fly venture within reach than the extremity of this treacherous weapon is disclosed, broad and cuneiform, and covered with a viscid fluid; and this, extended to its full length, is darted at its prey with an unerring aim, and redrawn within the jaws with a rapidity that renders the act almost invisible.[1] [Footnote 1: Prof. RYMER JONES, art. _Reptilia_, in TODD'S _Cyclop. of Anat_. vol. iv. pt. i. p. 292.] Whilst the faculty of this creature to assume all the colours of the rainbow has attracted the wonder of all ages, sufficient attention has hardly been given to the imperfect sympathy which subsists between the two lobes of its brain, and the two sets of nerves that permeate the opposite sides of its frame. Hence, not only has each of the eyes an action quite independent of the other, but one side of its body appears to be sometimes asleep whilst the other is vigilant and active; one will assume a green tinge whilst the opposite one is red; and it is said that the chameleon is utterly unable to swim, from the incapacity of the muscles of the two sides to act in concert. _Ceratophora_.--This which till lately was an unique lizard, known by only two specimens, one in the British Museum, and another in that of Leyden, was ascertained by Dr. Kelaart, about five years ago, to be a native of the higher Kandyan hills, where it is sometimes seen in the older trees in pursuit of insect larvæ. The first specimen brought to Europe was called _Ceratophora Stoddartii_, after the name of its finder; and the recent discovery of several others in the National Collection has enabled me, by the aid of Dr. A. Günther, to add some important facts to their history.