. La cyclopaedia d'anatomie et physiologie. Anatomie ; physiologie ; Zoologie. 272 REPTILIA. et le troisième de quatre, et la quatrième de trois, le même que dans les mains. C'était une observation faite d'aussi loin que le temps d'Aristote, que la division de la partie antérieure et postérieure du pied du caméléon est effectuée dans une manière inverse, cette dernière ayant le pouce et l'index joints seulement et tournées vers l'intérieur, mais les trois autres tournée vers l'extérieur, tandis que, comme il a été dit ci-dessus, le membre antérieur a trois tournées vers l'intérieur et deux seulement tournée vers l'extérieur,-une belle prestation pour assurer la

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. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 272 REPTILIA. and the third of four, and the fourth of three, the same as in the hands. It was an observation made as far back as the time of Aristotle, that the division of the anterior and of the posterior feet of the chameleon is effected in an inverse manner, the latter having the thumb and first finger only conjoined and turned inwards, but the other three turned outwards, whilst, as has been stated above, the anterior limb has three turned inwards and only two turned outwards, —a beautiful provision for ensuring the steadiness of the creature's grasp. The dragon (Draco) possesses fourteen pair Fig. 190.. of ribs, viz., six genuine, short, and curved ribs, which reach the breast-bone, and eight pairs of false straight ribs, which are seated in the wing membrane, and support the same. The posterior extremity of the ribs has a little head, in which there is a small socket of articulation, which is merely inserted upon the spherical articulating surface on the point of the transverse processes, and not at all into the bodies of the vertebrae. Owing to this re- markable mode of insertion, a very free joint is produced, enabling the ribs (especially those that are implanted in the wing membrane) to move forwards and backwards, and upwards and downwards, in different directions. Of the genuine ribs, the anterior ones are the short- est, and the posterior ones the longest ; they all terminate in a cartilaginous point, which attaches itself to the breast-bone. Of the eight pairs of false ribs, the five first pairs are very long, and the three following pairs are short, especially the two last pairs, which can- not be seen at all in the wing membrane. The false ribs become gradually thinner, and terminate at the edge of the wing membrane, in very fine cartilaginous points. In the whole animal kingdom, it is the dragon alone that exhibits this isolated and most remarkable structure. The wing memb

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