9 8 THE KINGDOM OF MAN 



common eel (fig. 20) ; the young and adult o( the mud- 

 fishes of Australia, Africa, and South America ; the fishes 

 of the Nile and Congo ; the gill-bearing earth-worms 

 and mud-worms ; the various forms of the caterpillar-like 

 Peripatus ; strange deep-sea fishes, polyps and sponges. 

 The main result of a good deal of such investigation 



FIG. 16. 



The Freshwater Jelly-fish of Lake Tanganyika (Limnocodium Tan' 

 ganyicae), magnified five times linear. Since its discovery in Tanganyika it 

 has been found also in the Lake Victoria Nyanza and in pools in the 

 Upper Niger basin. 



is measured by our increased knowledge of the pedigree 

 of organisms, what used to be called ' classification.' 

 The anatomical study by the Australian professors, Hill 

 and Wilson, of the teeth and the foetus of the Austra- 

 lian group of pouched mammals the marsupials has 



