The Sharks— Part Two 347 



Underviews of Hammerhead sharks show the distinctive profiles of these unusual 

 species. Left is the Common Hammerhead (Sphyrrui zygaena), right is the Great 

 Hammerhead (Sphyrna tudes). Courtesy, Scottie Allen 



possible that some day a Great Lakes species will be added to the unend- 

 ing list of sharks. 



Sharks are known to invade^ if not permanently inhabit, numerous 

 other fresh waters. They have been reported in Japan and the Philippine 

 Islands, and, as exploration continues, may be expected to be found in 

 more of the rivers of Africa, South and Central America, the East Indies, 

 and northern Australia. A shark, similar to the Ganges shark, if not 

 identical, gees at least 40 miles up the Rewa River on the island of 

 Suva in the Fiji group. It will attack waders in shallow water and is 

 much feared. 



Most, but not all, of the fresh-water-invading or -inhabiting sharks 

 are below 30° of latitude on either side of the Equator, with their preva- 

 lence increasing in the zones where there appears to be a narrow range 

 in the seasonal water temperatures. 



Family S'p/jj'r/z/W^e— Hammerhead Sharks 

 The Hammerhead, with its flat head tipped on either lobe by seem- 

 ingly malevolent eyes, looks like an omen of evil and, to a bather close 

 enough to see the Hammerhead charging toward him, this shark may 

 be a last, lethal apparition. Three Hammerheads were landed in one 

 net at Riverhead, Long Island, one day in 1805. In the largest of them 



