364 
BLUEFIELDS. 
The peculiarity, mentioned in the note, of the 
glass-like transparency of the lower eyelid (which, in 
these animals, is the larger, and performs the office 
of closing the eye) is well worthy of notice. I have 
elsewhere* remarked a structure exactly similar in the 
Woodslave {Mabouya agilis), a pretty little Scincoid 
lizard that plays about walls in Jamaica. In both 
cases, we may consider it a beautiful and effective 
provision, for the protection of the eye during the 
rapid movements of the animals, where sight would 
be indispensable. The Tree-toad dwells habitually 
among the sheathing leaves of the Wild-pines, always 
stiff and leathery, and often armed with sharp ser- 
rated spines at every edge. Among these it moves 
to and fro by violent headlong leaps, in which it 
needs to be guided by the sharpest sight. How in- 
teresting, then, is it to see that its gracious Creator 
has furnished it with a glassy window, which it may 
in a moment draw before its eye, for shelter from 
danger, without in the least hindering the clearness 
of its vision ! This structure has not, I believe, been 
noticed by any naturalist ; and, indeed, it is scarcely 
perceptible when the delicate membrane has become 
opaque by immersion in spirits. All thy works 
shall praise thee, O Lordl” 
That there is a second species of TracJiycephalus 
found in the western districts of Jamaica, I infer 
from the following description of one in Dr. Anthony 
Robinson’s MSS. ‘‘ Ran a palmis tetradactylis se- 
mipalmatis; plantis hexadactylis palmatis; pollice 
breviore. Weight, 2 oz. Troy. From the tip of 
the longest digit to that of the longest toe, 13 
* See Proceedings of the Zool. Soc. for 1 848, p. 60. 
