. Zoologia. Zoologia. Rospi e rane. 187 anche dell America Centrale, Peters trovato tracce di branchie esterne. La pipa o Surinam toad {Pipa Amsricana), che non ha alcuna lingua, né denti nella mascella superiore, presenta analoghe Iiabits di allevamento. In questo intci'esting toad i giovani sono forniti witli piccole branchie, che tuttavia non sono di alcuna utilità per loro, come i girini non entrare in acqua, ma sono portati su in cavità sul retro. Le uova sono collocate dal maschio sul retro della femmina. La femmina poi entra in acqua; la pelle si ispessisce, sorge intorno a ciascun uovo e forma un marsupiale sac o cella. Th

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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