224 



NATTJBAL HISTORY. 



openings beneath. 

 Like the Flatfish, they 

 move along in search 

 of their prey near the 

 bottom. Some species 

 reach a large size, the 

 Eagle Rays having 

 been seen twenty-five 

 feet long and thirty 

 broad. It is stated 

 that one was taken at 

 Barbadoes which 

 weighed 3500 pounds, 

 and that it required 

 seven yoke of oxen to 

 draw it ashore. 



Questions. What is said 

 of the distinction between 

 salt-water and fresh-water 

 Fishes? What is said of 

 the migration of Fishes? 

 What of the migration of 

 the Salmon ? Give the ob. 

 serration of Deslandes. 

 What is said of their fe- 

 cundity? What is said of the Sharks in this respect? Describe the 

 eggs of some Sharks. What is said of Fishes as supplying man with 

 food ? What is said of the classification of Fishes ? What is said 

 of the Swordfish? Of the John Dory? Of the Seahorse? Of the 

 Lophius ? Of the Sturgeon ? What are the characteristics of the 

 Flatfishes? How do they differ from all other Vertebrates? In 

 what water are most species found? What is said of the Halibut? 

 What are some of the fishes of the Herring family? What is said 

 of the true Herrings ? Why are Eels called Apoda ? What is said 

 of their scales ? What of their gills ? What of the gills of the Lam- 

 preys ? What of their mouth ? What is said of the Electrical Eel ? 

 Describe the arrangement of the electrical apparatus of the Torpedo. 

 What is said of the true Rays ? Give the comparison with the Flat 

 fish. What is said of the size of the Raws ? 



Fig. 177. Electric Apparatus of Torpedo. 



