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INDIAN FRESH-WATER FISHES. 
the whole length of the body, they grow to a large 
size. 
Chimceridce. 
Are very extraordinary looking fishes, very bril- 
liantly coloured, inhabiting the seas of the North 
and South Hemisphere remote from the Tropics. 
The sub-order Selachoidei, or Sharks, include the 
families : 
Scylliidce , or Dog-fish. 
Carchariidce , including the Blue Shark, Ilammer- 
headed Shark, etc. 
Lamnidce , including the terrible White Shark. 
Spinacidce , Rliinodontidai , Notidanidcc , Iletcrodontidcc , 
RMnidcc , and Pristiophoridcc. 
The Sub-Order Batoidei contains the 
Prist idee, or Saw-fish. 
Torpedinidce , or Electric fish. 
Rajidce , Trygonidoe , and Myliobatidcc , which com- 
prise the various Bays, Skates, Sting-rays, norned- 
rays, etc. 
Petromyzontidce. Lampreys. 
Are long-bodied snake-like fishes, with mouths 
formed into suckers by which they cling to stones, 
and a row of holes for breathing on each side of the 
throat. They live both in salt and fresh water. 
