SAW-FISHES. 



107 



are then seized by them and swallowed. They feed also largely on 

 cuttle-fishes. 



Fig. 95. 



:v 



fi'-v "teuSC ... iu~';!l '\ 



Lower view of head of Saw-fish. 



The Rhinobutidce (Case 42) contain the genera Rhynchobatus, [Case 42.] 

 Rhinobatus, and Trygonorhina. A fine series of Rhynchobatus 

 ancylostomus, with preparations of its curious dentition, is exhibited 

 in a separate case in the middle of the Gallery. They feed on 

 hard-shelled animals, and attain scarcely a length of 8 feet. They 

 are confined to the coasts of tropical and subtropical seas. 



The Turpedinidce, or Electric Rays (Case 42). — The electric 

 organs with which these fishes are armed are large, flat bodies 

 lying one on each side of the head ; they consist of an assemblage 

 of vertical hexagonal prisms, whose ends are in contact with 



the integuments above and below. 



The fish gives the electric 



