72 STUDIES OP ANIMAL LIFE. 



2. THE SNAIL. 



A. General Observations. 



1. Watch the snail and observe its actions. 



2. What is its form of symmetry? 



3. What means of protection has it ? (Disturb it 



gently.) 



B. The Shell. 



1. What fitness is there in the term " univalve " ? 



2. Ascertain the names of the different parts of the 



shell by comparing them with a diagram. (Dem.) 



3. Is the spiral right handed or left handed? (Hold 



the shell with the aperture toward you and the 

 spire pointing up.) 



4. Do all snails possess shells ? (Dem.) 



G. Locomotion. 



1. Identify the part (foot) by means of which the snail 



creeps. 



2. Can the snail creep backward as well as forward ? 



3. Can it climb up the side of the aquarium while under 



water ? While out of water ? 



4. Can it move on the surface of the water ? 



6. In what manner does it carry its shell when moving ? 

 6. Sketch. 



D. Sense Organs. 



1. Identify the tentacles. 



2. How many are there ? 



3. Identify the eyes. 



4. Indicate these structures in your sketch. 



E. Geotaxis. The movements of animals or plants with 



reference to gravity is termed geotaxis. (Dem.) 



