224 NATURAL HISTORY. - 
openings beneath. 
Like the Flatfish, they 
move along in search 
/ | =i of their prey near the 
A sh AN ee bottom. Some species 
\ K SEIN 
H ee = : reach a large size, the 
NG | Eagle Rays having 
1 Aes i been seen twenty-five 
oS x os feet long and thirty 
broad. It is stated 
that one was taken at 
} Barbadoes which 
\ / weighed 3500 pounds, 
\ Caets, and that it required 
se seven yoke of oxen to 
by draw it ashore. 
Questions.—W hat is said 
of the distinction between 
salt-water and fresh-water 
a / Fishes? What is said of 
ue the migration of Fishes? 
= What of the migration of 
J the Salmon? Give the ob- 
servation 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 Kel ? 
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 Rays? 
Fig. 177.—Electric Apparatus of Torpedo. 
