CLASS PISCES: ORDER GAKOIDEI. 189 



are in numerous rows, held by strong skin upon the rounded 

 edge of the jaws ; but Mg ^ 



only the outer row 

 stands perpendicular- 

 ly and can be used. 

 As fast as any drop 

 out from wear or 

 fracture, inner ones 

 move forward to take 

 their place. The 



TT \ j cn 7 Shark's Egg. 



Hammer-head Kliark 



is sometimes thirty feet long. Its eyes are at the end of the 

 lateral prolongations of the head, which can be bent so that 

 the shark can see its victim on both sides as it settles down 

 upon it. The eggs of both Kays and Sharks are horn-like 

 sacs, with tendrils for clinging to the sea- weed. 



ORDER GANOIDEI. 



Ganoidei (enameled). The Ganoids include the Gar- 

 pike, with its enameled scales in oblique transverse rows, 



Fig. 323. 



JLepidostfus ossZus^ Gar-pike. . 



and the Sturgeon, with its bony plates. The latter feeds 

 upon the garbage and vegetation on the muddy bottoms of 

 the great rivers. 



winch, and turned the eteam on. Some then hauled his tail np, while all available 

 hands dragged at the other line, which held his head. As soon as we pot him on 

 board be broke off about three feet of the ship's bulwarks by a single lash of his 

 tremendous tail. This was then cut off by the boatswain with a hatchet, while a 

 dozen of us with bowie-knives finished him. We found in his stomach six large 

 snakes, two empty quart bottles, two dozen lobsters, a sheep-skin and horns and the 

 shank-bones, which the cook had thrown overboard two days before. The liver 

 filled two large wash-deck tubs, and when tried out gave us ten gallons of oil." 



