No. 405.] DEVELOPMENT AMONG ANURA. 795 
found on several of the islands of the West Indies. Super- 
ficial descriptions of the eggs are recorded by two writers 
(Bello, '71; Peters, '76). The eggs were found on -damp 
leaves of plants, and near them was the female, apparently on 
guard. The frogs hatched in the adult form after fourteen days. 
The embryo is described as wrapped about the yolk, like a 
mammal. On the seventh or eighth day both pairs of legs 
were present, and the tail, eyes, and pulsating blood vessels 
were observed. On the twelfth the characteristic toes and 
suckers had appeared. The tail was turned downward, with 
the broad surface pressed against either the right or left side of 
the embryo. There was no trace of gills or gill-slits, but the 
tail was so fully supplied with blood that it was regarded, 
without doubt, as a breathing organ. On the fourteenth day 
newly hatched embryos were 5 mm. in length, and the tail, 
Which measured about 1.8 mm., was absorbed during the course 
of the day. 
In 1873 there appeared in several magazines various ac- 
counts, by Bavay, of a frog which he called Hylodes martini- 
censis. The accounts differ in some respects from those of the 
other observers of Hylodes, but are not altogether consistent 
among themselves, so that Bavay’s observations were probably 
not very accurate. He affirms that in one locality, at least, 
spawning does not take place during the dry season, or even 
after lack of rain in the wet season; the eggs are always 
found in damp places, under stones or with decaying leaves. 
Instead of fourteen days, he allows only ten or eleven for hatch- 
ing, and states that the frog goes through the usual metamor- 
phosis within the egg. The eyes, legs, tail, and feet he 
describes at a period earlier than that in which they were 
found by the other observers, but in regard to.the tail his own 
accounts vary; he stated at first that it disappeared two days 
before hatching, but afterwards announced in a published let- 
ter that he found a vestige of a tail in tadpoles just hatched, 
when they were hardened in glycerine. The vitellus, accord- 
ing to his observations, was at first connected with the embryo 
by a cord, for the embryo on the fourth day moved independ- 
ently of the yolk-mass, although at the same time both 
