22 Mr. G. A . Boulenger on ttco new Chamceleons 



days. Nearly every specimen possesses a pair of tubular 

 filaments inserted on each side of the zoarium, about midway 

 between the margin and the summit on the upper surface ; 

 each tube is about { an inch long, and in some cases attached 

 to the tubes of an annelid, and in others to fragments of 

 shell. Some of the specimens have begun to form new 

 attachment-tubes, which are about three times the height of 

 the coecia. Each tube is seen to be lined with a layer of sar- 

 code similar to that seen in the growing offshoots m Victorella 

 pavidttj S. Kent, consisting of granular and fusiform bodies 

 which form a kind of network. The tube appears to grow 

 out of an avicularium either at the side or in front of the 

 zocecial orifice. After repeatedly counting the number of 

 tentacles I find that they vary from thirteen to fifteen. The 

 pore above the mouth is covered by a membrane, and the 

 marginal row of zooecia have the peristome produced below 

 into an acute, triangular, hyaline point. 



III. — Descrii)tion oftico new Chamceleons from Nossi B6, 

 • Madagascar. By G. A. BoULENGER. 



[Plate n.] 



ChamoiJeon Guentheri. (PI. II. fig. l,c?; fig. 2, ? .) 



Casque elevated posteriorly, with strong, curved parietal 

 crest j the distance between the commissure of the mouth and 

 the extremity of the casque equals the distance between the 

 end of the snout and the posterior border of the orbit ; lateral 

 crest strong and distinct all round the head, strongest and 

 tubercular on the canthi rostrales ; upper head-scales very 

 unequal in size ; the snout terminating in the male in a 

 short, horizontal, bony process, broader than long, half as long 

 as the diameter of the eye, concave above (like the frontal 

 region, of which it is the continuation), and notched mesially ; 

 a mere indication of this rostral process in the female j casque 

 angular posteriorly ; no trace of occipital lobes. Body 

 covered with moderate-sized granules intermixed with nume- 

 rous slightly enlarged ones. A dorsal crest of large conical 

 tubercles, stronger in the male than in the female j a strong 

 ventral crest, interrupted from or subcontinuous with a less 

 developed gular crest. No tarsal process. Tail longer than 

 head and body. Uniform black. 



