6 PROTOZOA. 



podia extend? They may be seen to contain minute granules 

 when studied with the high power and best light. 



6. If possible, observe the process of catching food with the 

 tips of the pseudopodia and the manner in which it is drawn 

 toward the body. Note any motion on the surface of the body 

 as the food is drawn closer, and also the manner in which the 

 food is finally ingested. Are there any indications that the 

 pseudopodia extend as still finer filaments beyond the point to 

 which it is possible to trace them with the highest magnifica- 

 tion at hand? If the capturing of food is observed, make a 

 series of diagrams to illustrate the process. 



If possible, observe a specimen undergoing division. Draw. 



It is desirable to examine Clathrulina, noting the stalk and 

 skeleton. Look over figures. 



MASTIGOPHORA. 



EUGLENA. 



Understand its habitat and with what forms it is usually 

 associated. 



1. Observe the free-swimming movements of the organism, 

 and the eiiglcnoid changes in the form of the body. 



Make drawings showiny the changes in the shape of a single in- 

 dividual. 



2. Distinguish anterior and posterior ends. Is there any 

 dorso-ventral differentiation? Note the motile organ, the flagcl- 

 Iui. Where is it attached? What relation dors it bear to the 

 gullet? I low is it, directed during locomotion of the organism. 

 Does it servo any other purpose besides locomotion? 



3. The green color of Kuglcna is due to chlorophyl, and this 

 enables the animal to live in the clearest water, being nourished 

 like a typical green plant, but minute particles of food are also 

 taken into t he endoplasin through the gullet, and thus Isuglena 

 combines lnilo:nfc and ho/<>i>/n///r met hods of nutrition. Consider 

 the bearing of this on the position of Euglena and its allies in 

 the protn/oan scale. 



