THE 
AMERICAN NATURALIST 
= NOL. XXXIV. September, T900. No. 405. 
UNUSUAL MODES OF BREEDING AND 
DEVELOPMENT AMONG ANURA. 
LILIAN V. SAMPSON. 
It has been my good fortune to obtain from Jamaica a com- 
plete series of stages of the development of Hylodes martini- 
censis. The eggs of this frog are deposited on land, and the 
entire development takes place within the egg-membranes. 
The Stages that correspond to the tadpole of our common 
frogs are passed through inside the egg-membrane and a fully 
formed frog emerges at the time of hatching. In connection 
with the study of the development of Hylodes it has been 
... Necessary to collect the descriptions that have been given 
at exceptional modes of development in the Anura. These 
. Accounts are often very fragmentary and widely scattered, so 
that no small labor has been necessary to bring together the 
literature of the subject. In the hope that a consecutive and 
full account of what is known may be of service to others, the 
following pages have been prepared. 
In the groups of fishes and Amphibia the eggs are gen- 
erally laid in large quantities and are left unprotected, but 
. there are other exceptional modes of propagation in species of 
687 
