MIR- -RIBEIRO — CERATOPHRYS AND STOMBUS 211 
The tadpoles thrust one of their forelegs through the aperture and a day or 
two later the other; the mouth, however, remaining nearly unchanged, a 
retraction of the labial fringes is noted and next day the chitinoid dental 
patches were found at the bottom, of the aquarium. It is noted that the 
fringes have retracted and that there is a weakening of tissues towards 
the sides of the snout which retracts, the optic region narrows; the forefeet 
have a short interdigital membrane, less evident on the inner joints. The 
colouring is brighter, more ranoid; the green bright, there are two black 
“stripes on the canthus rostralis, one subocular the other vertical in the 
center of the check, another long post-tympanic followed by a further 
hypochondrial one; four or six rough and granulous dorsolumbar patches 
also black. The arms have two sepiacic bands and the legs 7. The yellow 
mark on the lip hardly distinguishable; the interocular is evident but the 
eyelids still vrithout appendix. The aspect though well defined as “intanha”, 
resembles genus Rana, specially in colouring. The caudal membrane is 
transparent, more greenish and the whole abdomen white. The excavating 
shovel can be seen on the heel, 10 days later the tail has been absorbed, the 
ocular appendices are already visible, the mouth dilated, the tympanus 
evident and the small “intanha” leaves the water for the woods. Recapi- 
tulating and starting from fig. 1, we have the following data: 
23 days (after) fig. 5. 
2 
2» - later appearance of brachial aperture. 
Rory » » » left arm. 
fato CORRER o » »- right »: 
atas » fall of the psittacorhyncoid teeth. 
10: » » absorption of tail. 
ão | 
Admitting of 30 days for stage of fig. 5, it is probable that the ma- 
ximum duration of evolution reaches seventy days. 
HABITS 
The tadpole is extremely voracious and exclusively carnivorous. - -, 
- Tt generally remaíns motionless during the day at the bottom of the poolit 
inhabits, rising now and again rapidlyto the surface to fill its pulmonary sacs 
with air. a a. | nodos | 
If by chance a tadpole of Leptodactylus passes within reach, it rushes 
forward and devours it entirely. Tts widecut mouth greatly favouring this 
end, It will attack any other tadpole — including its own species. As soon 
'as removed:from the water, It has the habit of swallowing air, grinding at 
