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^E. (1 Genus, 1 Species.) 

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

 DISTRIBUTION. Lake Superior, North America. 



FAMILY 67. GALAXID^E. (1 Genus, 12 Species.) 

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



DISTRIBUTION. The temperate zone of the Southern Hemi- 

 sphere. 



The only genus, Galaodas, 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. MORMYRID^E. (3 Genera, 2 ^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 ; Hyperopsius (2 sp.), Nile and West Africa ; Mormy- 

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



