292 Journal of the Asiatic Soctety of Bengal, [July, 1906. 
short distance forwards or upwards without ceasing to cling to its 
-support. In the larva of Rana latopalmata, however, and of simi- 
lar forms, the mouth has become, or rather remained, an organ of 
the smaller sucker found in a somewhat similar position in many 
tadpoles at an earlier stage of development. 
The tadpole of Megalophrys montana has neither a strongly 
-suctorial mouth nor a large ventral sucker, but it is able to make 
tiebigit ; but the homology is not complete. As I have shown else- 
where (op. cit.), the horny teeth with which the float or funnel is 
studded have an entirely different structure from those of other 
‘tadpoles, being distinctly multicellular in origin. The functional 
analogy between this organ and the lips of Rana tadpoles is re- 
mote, and the habits of the larve differ completely from those of 
‘montana remain, at any rate during the day, in corners at the 
lightly on the surface; but when they are making their way into 
narrow cavities it is folded together and the enormous lower lip 
(although they are not on the exposed surface when it is folded) 
by giving it additional strength. The lower lip also serves, how- 
“ever, another purpose, which has not previously been noticed. As 
its posterior surface, because of smoothness and considerable area, 
1s strongly adhesive, the tadpole is able to cling to smooth, vertical 
objects with its assistance, and at the same time to progress up 
; those of Megal h ‘ 
face of the ieate montana, by means of the posterior sur 
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