448 GEOGRAPHICAL ZOOLOGY. [part iv. 



Europe, Asia, and North America ; Argentina (4 sp.), Mediter- 

 ranean and deep seas of Western Europe ; Microstoma (2 sp.), 

 Mediterranean, and seas of Greenland ; Salarix (2 sp.), China and 

 Japan, in seas and rivers. Salmo, Osmerus, Coregonus, and 

 Thymallus, are British genera. 



Family 66.— PERCOPSID^. (1 Genus, 1 Species.) 

 " A fresh-water fish covered with toothed scales." 

 Distribution. — Lake Superior, North America. 



Family 67.— GALAXID^. (1 Genus, 12 Species.) 



" Fresh-water fishes, with neither scales nor barbels." 



Distribution. — The temperate zone of the Southern Hemi- 

 sphere. 



The only genus, Galaxias, is found in New Zealand, Tasma- 

 nia, and Tierra del.Fuego, ranging north as far as Queensland 

 and Chili ; and one of the species is absolutely identical in the 

 two regions. 



Family 68.— MORMYEID^. (3 Genera, 25 Species.) 



" Fresh-water fishes, with scales on the body and tail but not 

 on the head, and no barbels." 



Distribution. — The Ethiopian Region. 



Most abundant in the Nile, a few from the Gambia, the 

 Congo, and Rovuma. The genera are : — 



Mormyrus (1 sp.), Nile, Gambia, West Africa, Mozambique, 

 Rovuma ; Hyperopdus (2 sp.), Nile and West Africa ; Mormy- 

 rops (4 sp.), Nile, West Africa and Mozambique. 



