110 



CLASS-BOOK OF ZOOLOGY. 



5th Order. — Thoracic Fishes. 



Fig. 29. 



I^stfSfiS^SS*^ 



The Mackerel. — (Scomber Scomber.) 

 6th Order. — Abdominal Fishes. 



Fig. 30. 



The Flying-fish. — (Exocetus volitans.) 



questions on SECT. XXV. 



§ 443. What is Ichthyology? 



§ 444. Describe Fishes. 



§ 445. Of what do fins consist, and what are their names? 



§ 446. Describe them. 



§ 447. What organs are called gills ? 



§ 448. Of what use are teeth to fishes, and where are they found? 



§ 449. How are many fishes armed ? 



§ 450, What do you know of their frame ? 



§ 451. How do they facilitate their swimming ? 



§ 452. Describe the swimming-bladder. 



§ 453. What do fishes effect by it? What experiments are related? 



§ 454. What do you know of fish-eggs ? 



§ 455. What do you know of their hatching? 



§ 456. Of what use are fishes ? 



§ 457. What people make a kind of bread of them? 



§ 458. What can you say of the Romans and Greeks with respect to 



§ 459. Into how many Orders may fishes be divided ? Name them. 



