VI 



THE DOMESTIC LIFE OF ANIMALS 119 



is past. They breathe and feed in a marvellous way 

 within the body of the mother, and are born as lung- 

 breathers. In the case of the Surinam Toad (Pipa), the 

 male places half 

 a hundred eggs 



C5O 



on the back of 

 the female, 

 where they be- 

 come surrounded 

 by small pockets 

 of skin, from 

 which the young 

 toads writhe out 

 fully formed. In 

 two other cases 

 (Nototrema a n d 

 N oto delphys), 

 the above some- 

 what expensive 

 adaptation, 

 which involves a 

 great destruc- 

 tion of skin, is 

 replaced by a 

 dorsal pouch in 

 which the eggs 

 hate h, an ar- 

 rangement dim- 

 ly suggestive of 

 the pouch o f 

 kangaroos and 

 other marsupial 

 mammals. 



Fishes and 

 amphibians are 

 linked closely by 

 their likeness in 

 structure, and, as we have seen, they are somewhat 

 alike in parental habits ; but how great is the con- 

 trast between the habits of birds and reptiles, in spite 



FIG. 35. ENLARGED THROAT-POUCH OR CROAK- 

 ING SAC OF MALE OF A SMALL CHILIAN FROG, 

 Rhiiwdcrma danvini. (After Howes.) 



Within the pouch the eggs develop into 

 minute frogs. 



