282 
FROGS AND TOADS. 
first saw some slight movement in the water, produced by something stirring 
below the surface. We then soon saw a mass of mud rising to the surface, carried 
by a tree-frog, of which no more than the two hands emerged. Diving again, after 
a moment’s time, the frog brought up a second mass of mud, near the first. This 
was repeated many times, the result being the gradual erection of a circular wall. 
From time to time the head and front part of the body of the builder appeared 
suddenly with a load of mud at some point; but what astonished us in the highest- 
degree was the manner in which the frog used its hands for smoothing the mud- 
wall, as would a mason with his trowel. And by examining the hands of this- 
liyla, it will readily be understood how they are most serviceable trowels, their 
terminal joints bearing large expansions. This careful process of smoothing could 
be better observed as the wall gradually heightened, until it reached about four 
inches, when the frog was compelled to come out of the water. The parapet of 
the wall receives the most careful smoothening, the outside being neglected, and 
the levelling of the bottom attained by the action of the lower surface of the 
creature’s body, aided by the hands. The aspect of the pool may be compared to 
the crater of a volcano, or a vessel of a foot in diameter filled with water. Although 
the female undertakes the entire task of building, she is incommoded the whole 
time by the male sitting on her back. Should he be frightened from his post, he 
will soon emerge from the water at a distance of a few feet, when, if signs of 
danger be wanting, he will climb the walls of the nest and regain his original seat.” 
Another Brazilian tree-frog of the same genus (H. goeldii) breeds in the 
water contained in the central cup of certain trees belonging to the Bromeliacece . 
Dr. Goeldi states that the first specimen found was a female, carrying on her 
back a large globular mass of whitish eggs. When put in a vivarium, “ for a 
few days the egg-mass remained attached to the mother’s back. But suddenly 
it fell away, and simultaneously I saw in the glass some small, nearly black 
coloured frogs, all provided with the anterior and posterior legs, together with 
a larval tail of medium or rather small size.” 
Yet another tree-frog from Brazil (H. nebulosa ) has acquired the remarkable 
habit of depositing its eggs in the sheaths of old and decaying leaves of bananas. 
The writer from whom we have been quoting states that this frog “ glues its lumps 
of eggs on the edges and 011 the inside of banana leaves, where, even during the 
hot hours of the day, sufficient coolness and moisture are preserved. These lumps 
are enclosed in a frothy, whitish substance, comparable to the scum formed by 
certain Cicadidce. Sometimes the tailed larvae are seen struggling in this frothy 
mass. If put into fresh water, all will die in a few hours.” 
Pouched Tree- On account of the peculiarity of their reproduction, mention 
Frogs. must be made of the curious pouched tree-frogs ( Nototrema ), dis¬ 
tinguished from the typical genus by the presence of a backwardly-opening pouch 
at the hinder-end of the back in the females. These frogs are represented by some 
half-dozen species, mainly confined to Central and Western Tropical America, 
although one of their number is found on the eastern side of that continent at 
Pernambuco. The pouch of the female is extended beneath the skin of the back 
and sides to form a very large chamber, in which the eggs and tadpoles undergo- 
the whole of their transformations. The eggs, generally fifteen or sixteen in 
