136 ANIMAL ACTIVITIES. 
of coral skeletons shows some facts concerning coral 
growth. 
Examine the skeleton of Fungza. Remember that 
this is the skeleton of an animal something like the 
Fic. 115.—The Structure of a Sea-anemone. 4, longitudinal section; 
B, transverse section; #, mouth; 0, eggs; ¢, tentacle. 
sea-anemone. What are some peculiarities of this 
skeleton ? 
Examine pieces of Galaxea skeleton. How does 
Galaxea differ from Fungia ? 
Count the septa in several tubes of Galaxea. How 
many? The parts of the tubes projecting above the 
general structure are called the ¢hece. 
Examine a branch of Madrepora. How does this 
differ from Fungia ? from Galaxea ? 
Do you find thecz and septa in Madrepora ? 
Were all the polyps of the same size ? 
How did the branches in Madrepora arise ? 
Were the lateral polyps connected with the central 
polyps? Use branches sawed longitudinally to show 
this point. 
How did the lateral polyps arise in the course of 
growth? 
How did the colony develop from a single polyp ? 
Summary of Drawings. (a) Fungia skeleton, nat- 
ural size. 
(4) Galaxea skeleton showing several tubes x 3. 
