82 THE BIOLOGY OF THE ANIMAL 



study both in direct and in reflected light with the low 

 power. 



MOEPHOLOGT 



a. Size. — Is the animal plainly visible ? Do its length 

 and breadth vary at different times ? Is there 

 any relation between the variations in the two 

 dimensions ? Does the size of the attached por- 

 tion or disk vary ? 



5. Shape.- — What is the general shape of the body? 

 Does the body keep a definite shape ? Is it 

 symmetrical ? Is the body flexible or rigid ? 

 Do you find any specimens whose bodies are 

 plainly irregular in shape ? Are these irregu- 

 larities the same in position and size on differ- 

 ent individuals ? Do you find any specimens 

 which appear to be colonies rather than single 

 individuals ? If so, of how many individuals 

 does the colony consist? Are all the members 

 of the colony equally well developed ? At what 

 points are their bodies united ? 



G. Color. — What is the general color of the body? 

 Does it vary in different individuals? Is the 

 body of the same individual evenly colored ? 

 Does its color vary at different times ? 



d. St/ructure.- — -Make out the following parts of the 

 body: 

 1. The disk or foot (attached portion). — How 

 much of the entire body does it form ? How 

 does it compare in diameter with the body 

 proper? What is its outline? Is the body 

 attached by any other part than by its base ? 



