34 PROTOZOA 



determine the species. Understand the relation of the in- 

 dividual cells to the colony. (See Doflein and Reichenow.) 



Draw a figure showing several cells and their protoplas- 

 mic connections. 



3. Compare in detail an individual cell with Euglena. 



4. Observe, if possible, certain cells, called parthenogo- 

 nidia, which are specialized for asexual reproduction. These 

 divide and form the daughter colonies, which become de- 

 tached and swim in the interior of the parent colony. They 

 are finally liberated by the rupture of the wall of the parent 



colony. 



Make a figure of a parent colony that incloses several 



daughter colonies of different sizes. 



5. Volvox globator is monoecious. Look for macro- 

 gametes and bundles of microgametes. 



Figure them. 



6. Be sure to recognize the significance of the fact that 

 the cells of Volvox are differentiated into somatic and germ 

 cells, and to understand the resulting physiological division 



of labor. 



7. Consider the reasons for and against regarding Volvox 

 and allied organisms as plants rather than animals. 



Meyer: Ueber den Bau von V. aureus and V. globator. Bot. Cent., 63, 

 1895. 



CERATIUM 



1. Examine this form with a high power, and in a favor- 

 able specimen notice the sculptured outer surface of the 

 cellulose test. The living animals are green or brown owing 

 to the presence of chromatophores in the protoplasm. 



2. Note the furrow encircling the body. Does it extend 

 completely around it? Is there a short furrow on one side 

 at right angles to the first, or a depression of considerable 

 size? Understand the position of the fiagella. 



Draw the animal, showing the points observed. 



Look for examples of the earlier stages of division, and 



