II4 ANIMAL ACTIVITIES. 
(§) The class to which it belongs, with reasons for 
the answer. 
(6) In the case of Insecta, name the order to which 
the insect belongs, with reasons for the answer. 
Questions. (1) Why are the animals just studied 
called crustacea ? 
(2) How does their manner of breathing compare 
with that of Insecta ? 
(3) Do lobsters breathe air? Explain. 
(4) What is meant by homology? By analogy? 
(5) What is serial homology ? 
(6) Where may one find cyclops ? 
(7) Why is cyclops so named ? 
(8) How do the crabs differ from the shrimp ? 
(9) In what way do barnacles resemble the shrimp ? 
(10) How does the hermit-crab differ from other 
crabs? 
(11) In what cases among crustacea does the mode 
of life seem to affect the shape of the body ? 
(12) What occurs when the limb of a crustacean is 
broken off? What reason have you for your answer ? 
(13) What is phosphorescence ? How do you ex- 
plain it? 
(14) Do the crustacea moult? How do you know? 
(15) Do you know any animals which do not have 
both sides alike ? 
(16) Give examples of differentiation. 
Topics for Reports. The Hermit-crab. Robber- 
crabs. Lobsters. Cyclops. Phosphorescence. Giant 
Crustacea. Degeneration. Uses of Crustacea. 
