40 MR. F. E. BEDDARD ON THE ANATOMY [Jan. 15, 



A specimen which I had the opportunity of examining fresh 

 showed how the hmgs may vary in individuals, as was pointed 

 out by Wiedersheim. This variation consists principally in the 

 larger number of cseca. I should mention, however, first of all 

 that thei'e is just a shadow of a doubt as to the identity of the 

 species. In the second smaller specimen the occipital lobes 

 characteristic of the species were disproportionately smaller than 

 in the larger individual, whose lungs I have already described. 

 In the second place, the larger individual had no trace whatever 

 of the " Hohlenvenenfortsatz " of the right lobe of the liver 

 accompanying the postcaval vein. In the smaller individual there 

 was a considerable process of hepatic tissue accompanying the 

 postcaval vein for some distance. 



In the case of both right and left lung, the lung ended, in the 

 same way as in the example already described, in one bifid caecum, 

 bifid from the very first. In one lung I counted 14 other csecal 

 outgrowths, of which five were particularly short. In the other 

 lung I I found as many as 16 outgrowths, of which only three or 

 four wei-e short. Two, or even three, sometimes borne upon the 

 same stem. The cseca are of considerable diameter and clubbed 

 in foi'm ; they contrast markedly with those of Ch. verrucosus. 



I have also selected for figuring the lung of Ch. parvilohus (text- 

 fig. 12), which is at the very opposite extremity from the other 

 species figured in the present communication, viz. Ch. dilepis. The 

 caeca are numerous and extremely slender and in some cases of great 

 length. Thus the longest measures 33 mm. as against 32 mm. of 

 the length of the lung itself, and there are several other cseca 

 nearly or quite as long. The longest of the diverticula are at the 

 posterior end of the lung. The whole ventral border is also beset 

 with diverticula, but these are invariably short ; all show a marked 

 dilatation at the free extremity. In contrasting these slender ex- 

 tended diverticula with the short thick diverticula of the two species 

 Ch. dilejyis and Ch. basiliscus, to be described immediately, one is 

 disposed to believe that greater contractility in the case of the 

 two lattei- may account for the great diflTerence which they show 

 from the species here under consideration ; especially since Milani's 

 figin-e * of the lung of Ch. basiliscus indicates long slender diverti- 

 cula with slightly pronounced dilatations at their extremities. 



Chcmiceleon basiliscus has lungs which have been described by 

 Milanit and which agree most nearly pex^haps with those of 

 Ch. dilepis. The lung itself is extensive and reaches back nearly 

 to the kidney. The specimen which I had the opportunity of 

 examining had been preserved for some time in alcohol. In 

 neither lung could I find any caeca depending fi-om the ventral 

 mai-gin of the organ, and in the left lung I did not find more 

 than a single caecum at the posterior end of the lung, but conspi- 

 cuous enough when detected by its yellow colour as contrasted 

 with the colourless and transparent wall of the lung itself. In the 



* Zool. Jahrb. (Abth. f. Anat.) vii. p. 577. 

 t IjOc. cit. p. 576. 



