. Zoologie. Zoologie. Crapauds et grenouilles. 187 également d'Amérique centrale, Peters a trouvé des traces de branchies externes. Le Pipa, le Surinam ou Amsricana {crapaud Pipa), qui n'a pas de langue, ni les dents dans la mâchoire supérieure, a Iiabits reproduction similaires. Dans ce intci'esting les jeunes crapauds sont fournis witli petites branchies, qui, cependant, ne sont d'aucune utilité, comme les têtards n'entrez pas dans l'eau, mais sont réalisées à propos dans des cavités à l'arrière. Les oeufs sont placés par le mâle sur le dos de la femelle. La femelle entre alors dans l'eau ; la peau s'épaissit, s'élève autour de chaque oeuf et forme un sac marsupial ou cellule. E

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. Zoology. Zoology. TOADS AND FROGS. 187 also of Central America, Peters found traces of external gills. The Pipa, or Surinam toad {Pipa Amsricana), which has no tongue, neither teeth in the upper jaw, has similar breeding Iiabits. In this intci'esting toad the young are provided witli small gills, which, however, are of no use to them, as the tadpoles do not enter the water, but are carried about in cavities on the back. The eggs are placed by the male on the back of the female. The female then enters the water; the skin thickens, rises up around each egg and forms a marsupial sac or cell. The young pass through their motamorpiiosis m the sacs, having tails and rudimentary gills; these are absorbed before they leave their cells, the limbs develop, and the young pass out in the form of the adult. The toad (Biifo lentiginosus) is ex- ceedingly useful as a destroyer of noxious insects. It is nocturnal in its habits; is harmless, and can be taken up with impunity, tiiough it . .. â 1 a â -I J! Fig. 233.âThe Martinique gives out an irritant acrid lluid irom Tree-toad carrying the the skin, which if transferred to tlie yo"°gonis ac . eye or lids occasions some pain. In the Northern States toads begin to make their peculiar low trilling notes from the middle to the 20th of April; from the latter date until the first of June they lay their eggs in long double strings, and the tadpoles are usually hatched in about ten days after tiie eggs are laid. Of the true frogs (Rana) there are numerous species; of these the largest is the bull-frog, which makes a deep, hoarse, grunting noise. Smaller and more common species are the pickerel-frog and the marsh-frog. The frogs lay their eggs in roundish masses in ponds and pools from April to June, according to the latitude. While most frogs are greedily devoured by herons and other large wading birds, as well as ducks and geese, and. Please note that these images are extracted from scanned page images that may have been di

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• bookcentury1800
• bookdecade1890
• booksubjectzoology
• bookyear1897