42 MK. F. E. BEDDARD ON THE ANATOMY [Jan. 15, 



species in the foregoing pages, and that is certainly the general 

 impression among zoologists and anatomists. I was greatly sur- 

 prised therefore to find that the lungs of Gh. jyuniilits are quite 

 unpi'ovided with these otherwise characteiistic outgrowths. The 

 margin of the lungs is entire and slightly sinuous, the convexities 

 occurring in the sinuous line being pei-haps to be looked upon as 

 rudiments or incipia of the csecal appendages. It will be observed 

 that the absence of these caeca is associated with a more complete 

 I'etention of the typical pulmonary structure of the lung, and 

 therefore its greater efficiency as a breathing-organ. On the other 

 hand, it is to be noted that where the csecal tubes exist the lung 

 itself has lost considerably the alveolate structure and thus pre- 

 sumably some of its efficiency as a breathing-organ. The Ophidia 

 particularly show that the lung may be too large for its office as 

 a respiratory organ, and they, like the Chamaeleons, are often 

 lethargic in habit. 



The above account of the lungs of Chamiceleon pumihts is, in so 

 far as the absence of tags is concerned, in harmony with the 

 description of both Meckel * and Ouvier f. The latter observes : 

 " Le Cameleon nain n'a rien de pareil ; ses poumons sont deux 

 petits sacs simples, ovales, de grandeur egale, comme ceux de la 

 plupart des Sauriens " ; and on another page : "lis manquent 

 d'appendices." Milani, however, obviously doubts these state- 

 ments in writing J as he does : " Ob bei Chccmceleon pwinilus die 

 Zipfel wirklich fehlen, oder ob diese Behauptung nicht vielleicht 

 auf ein mangelhaftes Praparat zuriickzuf iihi'en ist, wage ich hier 

 nicht zu entscheiden." It is because of the latter doubt cast upon 

 the facts that I have entered into the matter at some length, and, 

 as I hope, settled it. 



I have finally to add to the description of the lungs in various 

 Chama;leons that Ch. tceniohronchtis agrees entirely with Gh. 

 jniojiilus in the total absence of diverticula, an agreement which is 

 very significant in view of other facts. 



The pigmentation of the interior of the body varies among the 

 species of this genus. In all that I have examined the intestinal 

 tract is a deep black, and there are generally (but not in Gh. ver- 

 rucosus) patches of pigment upon the stomach not distributed so 

 universally. The mesenteron is lai-gely pigmented anteriorly 

 in Gh. ve7'rucosus. There is no variation, however, in the pig- 

 mentation of the gut. The parietal walls are not so generally 

 pigmented. It is, indeed, only in Gh. piimilus and in Gh. icenio- 

 brG7ichus, among the species which I have examined, that the 

 whole of the lining peritoneum of the body is of a deep black, 

 quite as deep as is the gut. This pigmentation also extends to 

 the mesenteries. In all of the remaining species the pigmentation 

 of the general body-cavity and the mesenteries is hardly to be 

 seen and only exists in very slight degree, so as not to affect the 



* " Respirationsj^stem der Reptilien," Deutsch. Arch. f. d. Pliys. 1818. 

 t LeQous d'Anat. Comp. 2me ed. par Duvernoy, t. vii. (Paris, 1840). 

 X Zool. Jahrb. (Abtli. f. Anat.) vii. p. 573, footnote. 



