698 THE AMERICAN NATURALIST. (VoL. XXXIV. 
with the Venezuelan frog VNototrema oviferum (Notodelphys 
ovipara, Opisthodelphys oviferum), found at Puerto Cabello. 
The female is provided with a large dorsal pouch, which opens 
to the outside at its posterior end. It has been regarded as an 
invagination of the skin, and unlike the dorsal cells of Pipa it 
is a permanent organ. Weinland (54) has described fifteen 
embryos that were contained in the pouch of one specimen, 
and had all reached the same point in development. They 
measured 18 mm. from head to tail, and were folded over a 
large yolk-mass, that formed about seven-eighths of the egg. 
The embryos were dark with pigment, but over the yolk there 
were only scattered pigment cells. The rudiments of body 
muscles are described as present beneath the skin about the 
yolk. The head was well defined and of the shape peculiar to 
the adult, with prominent eyes and semicircular nasal open- 
ings. The mouth was ventral near the anterior edge of 
the head, and measured little less than one-half the width of 
the head. It is said in the course of the description that the 
horny jaws were not developed, although at another place in 
the same account the embryo is paralleled, in respect to the 
mouth, with the newly hatched Alytes, where the tadpole 
mouth-parts are present. : 
In the embryo of Nototrema no adhesive gland was found, 
and the tongue was not developed. The fore legs measured 
about 2 mm. and were concealed beneath the operculum; the 
hind legs were twice as long, the toes were forming. The tail 
measured 5 mm. in length and 2 mm. in width, and with the 
hind legs was laid against the side of the egg. The heart was 
three-chambered, and the aortic arches separated not far from 
it. The dorsal aorta, posterior vena cava, and portal vein from 
the gut to the liver were large vessels. The lungs were well 
developed. The three-lobed liver, the gall bladder, and large 
pancreas were present, the pancreas surrounded by à coil of 
gut, leading to the stomach portion. The foregut and also the 
hindgut were thick-walled and appeared white, while the gut 
between them was formed of coils packed with yellow yolk. 
The pronephros had entirely disappeared, and the fat bodies 
and the kidneys were present. 
