THE XEWT AND ITS ALLIES 



263 



these a few of the more interesting deserve to be men- 

 tioned. 



FIG. 247. Section through skin of back of Pipa am a rircuia, showing develop- 

 ing embryos. Much enlarged. 



The Pipidae include the South American Pipa, note- 

 worthy because of the habit which the female has of 

 brooding its young in pits of the skin on her back 

 (Figs. 24ti, 247). 



FIG. 248. Nodelphys, brooding tree-frog, female, from Venezuela. In the 

 hinder part of the trunk the opening to the brood-pouch is seen. From a water- 

 color painting at the Museum of Comparative Zoology at Harvard College. 



The Hylidae, or tree-toads, include various arboreal 

 species in which the ends of the fingers are modified for 



