FISHES. 143 



food-fish. The three species of Osteoglossiiin are remarkably distributed, one being 

 found in Brazil, one in Australia, and the third in the East Indies. The single species 

 of Ileterutis inhabits tlie Nile. 



Tlie Galaxiidjs are small fishes, somewhat trout-like in appearance, fouiul in New 

 Zealand, Australia, and the southern ])arts of Soutii America. The body is rather elon- 

 gate, and without scales. The dorsal fin is opposite the anal, and similar to it, and 

 there is no adipose fin. As in the Salmonida?, there is no oviduct, the eggs falling 

 into the cavity of the abdomen before exclusion. About twelve species are recorded, 

 nearly half of them from New Zealand, where these fishes are most abundant, and 

 where \\w\ are loc.'illv kno>\ii as trout. 



The Haplochitoiod^ are still more ti-out-like, differing from the Salmonida? 

 chiefly in the structure of the mouth, the entire margin of the u])])er jaw being formed 

 by the premaxillary. Four species are known, belonging to the genera Ilaplochiton 

 and Prototroctes. The former is naked, and inhabits the lakes of Tierra del Fuego and 

 the Falkland Islands. The latter is found in Australia and New Zealand, where it is 

 often called grayling. In Prototroctes., the body is scaly. 



The small family of Salangid.e comprises two sjiecics allied to the Argentinid;e, 

 but with the alimentary canal straight for its whole length and without pyloric ajjpen- 



