266 



WISHES. 



FIG. 285. HAMMER-SHARK AND SAW-FISH. 



differs but little from that of ordinary fishes. Their skin is covered with a 

 multitude of small spines of stony hardness, and becomes very rough on dry- 



FIG. 286. SHARK'S EGG. 



ing, so as to form a sort of file (shagreen), much employed in the arts for 

 polishing hard bodies, such as ivory. Among these tyrants of the deep we 

 may select for special notice 



