c / 



Fig. 58. Fish, Chinook salmon {Oncorhynchus tschawytscha) 



a, egg; b, fish ready to break out of egg; c, more advanced stage; d, later stage, 

 still showing yolk-sac; e, j, more advanced stages; g, adult stage 



Fig. 59. Batrachian, newt (Amblystoma punctatuni) 



a, egg; b, first free-swimming stage, tadpole; c, more advanced stage, tadpole just 

 before the appearance of hind legs; d, later stage; e, adult form 











iv 





^ U'^'"' ■ 



Fig. 60. Wallaby and young 



The babies are not only protected and kept warm in the marsup'mm, or pouch, but 

 are also nourished by a milky secretion produced by glands in the lining of the pouch 



