1907.] OF CERTAIN SPECIES OF SQUAMATA. 47 



will be there seen that the sti-ong septa which produce a pouching 

 of the dorsal region of the lung in other Iguanids and Agamids 

 are also to be seen in Chamceleolis. I observed six of the chambers 

 altogethei', of which three would appear to belong to the anterioi- 

 part of the lung, i. e., that region which is in other Iguanids 

 divided off by a septum frora the posterioi- region, and three largei- 

 pouches belonging to the posterior region of the lung. Finally, 

 the end of the lung abi-uptly narrows and foi-ms a finger-shaped 

 region with a but slightly marked netwoi'k. It seems to me to be 

 possible to compare this with the Chamaeleon-like ou.tgrowths of 

 the lung in Polychrus mai-moraius * . 



In the fourth place, the right extremity of the liver is attached 

 by a fold of membi-ane which separates the lung from the post- 

 hepatic region of the body-cavity and is continuous with the 

 oviducal membrane. 



Besides these points, which, together with various extei-nal and 

 osteological charactei-s used by others, fix the systematic position 

 of Chamceleolis J there ai-e other features in its anatomy which I 

 have ascertained and which are worth noting as a contribution to 

 Lacertilian structui'e. 



The pigmentation of the body-cavity is in some ways remark- 

 able. The umbilical ligament, not only the region which is 

 attached to the livei-, but that which is attached to the stomach, 

 is deep black, and in the latter region contrasts with the yellowish 

 gut. The gut itself is, however, pigmented in the case of the 

 large intestine. This pigmentation is limited to the dorsal side 

 of the gut and involves the whole of the caecum. The appearance 

 presented is, indeed, of two tubes closely applied, of which one is 

 the small intestine and the other ends at the blind extremity of 

 the caecum. _ 



As in many Lacei'tilia, the peritoneum generally is deepl}^ pig- 

 mented, and a distinction is to be drawn between the posterior 

 pigmented region and the anterioi- region of the body-cavity, 

 where its walls are not pigmented at all, so far as naked-eye 

 appearances go. 



While, however, in most Lacertilia this line of demarcation is 

 quite oblique, bending ventrally in a continuous cui've, it is in 

 Chamceleolis quite ti'ansverse (to the longitudinal axis of the body) 

 in direction, but with a curved oiitline, now convex, now concave. 



The existence of bundles of plain muscular fibres in the mes- 

 enteries reaches a veiy great degree of development in many 

 Lacei-tilia. In the Lizard which forms the subject of the present 

 communication there was no development of such fibres that could 

 be seen with the unaided eye. The ovaries contained no mature 

 ova. There was a fully formed egg in each oviduct, with a dirtv 

 white shell of leathery consistency. There was no trace of an 

 embryo in the egg. 



The apex of the heai't is fixed to the pericardium by a vei'v 



* Milani, loc. cit. pi. xxxi. fig-. 15. . 



