34 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 Sonth Hemisphere remote from the Tropics. 



The sub-order Selachoidei, or Sharks, include the 

 families : 



ScylliidcB) or Dog-fish. 



Carchariidce, including the Blue Shark, Hammer- 

 headed Shark, etc. 



Lamnidce, including the terrible White Shark. 



Spinacidce, Rhinodontidce^ Notidanidce, Heterodontidce, 



Rhinidce, and Pristiophoridce. 



The Sub -Order Batoidei contains the 

 Pristidce, or Saw-fish. 

 Torpedinidce ) or Electric fish. 



Rajidce, Trygonidce, and 3fyliobatidcc, which com- 

 prise the various Bays, Skates, Sting-rays, Horned- 

 rays, etc. 



PetromyzontidcB. 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. 



