30 PROTOZOA 



the ciliation with that of other forms. Refer to Calkin's 

 Biology of the Protozoa, pp. 152-162, and understand the 

 relation of cirri, membranelles, etc., to cilia. 

 Draw, showing the structure in detail. 



2. Run some methyl green under the coverglass. What 

 is the shape of the macro-nucleus? The shape varies con- 

 siderably in the different genera. Is it possible to distinguish 

 the micronucleif 



3. Prepare a fresh slide and observe in detail the charac- 

 teristic movements and manner of creeping over various ob- 

 jects. As the animal turns sidewise, note the marked 

 dorso-ventral compression of the body. 



Represent this diagrammatically beside the previous 



drawing. 



It is desirable to examine permanently stained prepara- 

 tions for division stages, finer details of the nuclei, etc. 



Maier: Ueber den feineren Bau der Wimperapparate der Infusorien. 



Arch. f. Protistenk., 2, 1903. 

 Wallengren : Zur Kenntnis des Neubildungs und Resorptionsprocess bei 



den Teilung der Hypotrichen Infusorien. Zool. Jahrb., 15, 1901. 



EPHELOTA 



Mount a small piece of hydroid (e. g., Bougainvillia, 

 Campanularia, Sertularia, or Obelia) under a supported 

 coverglass and with a low power observe the suctorians 

 attached by delicate stalks. Select a field where the animals 

 are abundant and study under a high power. 



1. Note the general shape of the cell and the distribution 

 of the tentacles. Are all of the tentacles of one kind? Ob- 

 serve the movements of the tentacles and their use. Is there 

 any morphological relation between tentacles and cilia? (See 

 Minchin's Protozoa, p. 458.) 



Draw. 



2. Study the method of exogenous budding. What is the 

 relation of this type to simple division? Is the number of 

 buds in process of formation the same on all specimens? If 



