ETJPLOTES. 15 



among the most highly organized of the class Infusoria, as well 

 as of the entire phylum of Protozoa, and present a complexity 

 of structure and function which is not found probably within 

 the limits of a single cell elsewhere in the animal series. 



1. In an animal which is becoming quiet, note the mode of 

 locomotion, the shape of the body, the buccal groove, the con- 

 tractile vacuole, etc., as in other forms studied. Compare the 

 dilation with that of other forms. Refer to Calkins' Protozoa, 

 Fig. 98, and understand the relation of cirri, membranelles, etc., 

 to cilia. 



Draw, showing the structure in detail. 



2. Run some methyl-green under the cover-glass. What 

 is the shape of the macronucleusf The shape varies considera- 

 bly in the different genera. Is it possible to distinguish the 

 micronucleus? 



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

 istic movements and manner of creeping over various objects. 

 As the animal turns sidewise, note the marked dorso-ventral 

 compression of the body. 



Represent this diagrammaticalty beside the previous drawing. 

 It is desirable to examine permanently stained preparations 

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



Wallengren: Zur Kenntnis des Neubildungs und Resorptionsprocess bei den 

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



EUPLOTES. 



Mount a small piece of hydroid under a supported cover- 

 glass and with a low power observe the suctorians attached 

 by delicate stalks. Select a field where the animals are abun- 

 dant and study under a high power. 



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

 of the tentacles. Draw. Are all of the tentacles of one kind? 

 Observe the movements of the tentacles and their use. Is 

 there any morphological relation between tentacles and cilia? 

 (See Minchin's Protozoa, p. 458.) 



