234 



FISHES. 



Siluridae — 



HypopUhalmina ... .5 species. 



Pimelodina [Africa, 2 species] . . 70 „ 



Ariina [Africa, India, Australia, Fuegian] 35 „ 



Doradina [Africa] . . . 60 „ 



Hypostomatina [India] . . . 90 „ 



Aspredinina . . ■ 9 ,, 



Nematogenyina [Fuegian] — . 2 „ 



Trichomycterina [Fuegian] . . 2 „ 



Stegophilina . . . . 3 „ 



Characinidse [Africa] — • 



ErythriniTM . . ■ . 15 „ 



Curimatina . . ■ • 40 „ 



Anastomatina . ■ 25 ,, 



Tetragonopterina . . 80 „ 



Hydrooyonina . . ■ 30 „ 



Crenuchina ... 1 » 



Serrasalmonina . . . • 35 „ 



Cyprinodontidae — 



Camivorse [Europe, Asia, N. America, 



India, Africa] . . .30 



LimnophagoB . . . .31 



Osteoglossidse [Africa, India, Australia] . 2 



Gymnotidm . . . . .20 



Symbranchidse [India] . . 1 



672 species. 



Out of tlie 39 families or groups of Freshwater fishes, 

 9 only are represented in the Tropical American region. 

 This may be accounted for by the fact that South America is 

 too much isolated from the other regions of the Equatorial 

 zone to have received recent additions to its fauna. On the 

 other hand, the number of species exceeds that of every other 

 region, even of the Indian, with which, in regard to the com- 

 parative development of families, the Neotropical region shows 

 great analogy, as will be seen from the following Table : — 



