136 
ANIMAL ACTIVITIES . 
of coral skeletons shows some facts concerning coral 
growth. 
Examine the skeleton of Fungia. Remember that 
this is the skeleton of an animal something like the 
Fig. 
B 
115.—The Structure of a Sea-anemone. A , longitudinal section; 
B , transverse section; m, mouth; o, 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 thecce. 
Examine a branch of Madrepora. How does this 
differ from Fungia ? from Galaxea ? 
Do you find thecae 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. 
( b) Galaxea skeleton showing several tubes X 3- 
