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ZOOLOGY 



SEOi:. 



of skia covered by a gelatinous film. The embryos, which have 

 a large yolk-sac, develop in these pouches ; they never possess 





Fio. 956.— Nototrema marsupiatum. Female, with ijouch opened. (From Mivart.) 



external gills, and are hatched in the adult form. In the case 

 of several species the tadpoles are carried about by the female, 

 adhering to her dorsal surface by suckers or by a viscid secretion. 



Fig. 9S7.— Pipa americana. Female. (From Mivart.) 



Another Anuran, Pseudis paradoxa, is remarkable for the fact that 

 the tadpole is many times larger than the adult. 



Some Salamanders (S. maculosa and S. atra) and a species of 

 Cajcilia are viviparous. In the Black Salamander {B. atra), though 



