32 PROTOZOA 



4. Is it possible to distinguish a layer of myonemes just 

 external to the endoplasm? 



5. Is there another section of the body just anterior to 

 the protomerite? If so, this is the epimerite. 



6. Note that occasionally two (or more) individuals are 

 united. These aggregations are termed syzygies. 



Before reproduction Gregarina throws off the epimerite, 

 leaves it in the cell host, and falls into the lumen of the di- 

 gestive tract. It then encysts, and the protomerite and the 

 deutomerite form one spore-producing individual. The at- 

 tached stage in the life history of Gregarina is termed the 

 cephalont, and the detached stage, the sporont. (Minchin, 

 Fig. 7.) 



Make a drawing. 



Examine digestive tract of Phascolosoma gouldi for 

 Schizocystis sipunculi, an acephaline gregarine. 



Berndt: Beitrag zur Kenntnis der im Darme der Larv r e von Tenebrio 



molitor lebenden Gregarinen. Arch. f. Protistenk., 1, 1902. 

 Minchin: Sporozoa, pp. 177-179, Lankester's Treatise. 



PROTOPHYTA 



EUGLENA 



Understand its habitat and with what forms it is usually 

 associated. 



1. Observe the free-swimming movements of the organ- 

 ism, and the euglenoid changes in the form of the body. 



Make drawings showing the changes in the shape of a 

 single individual. 



2. Distinguish anterior and posterior ends. Is there any 

 dorso- ventral differentiation? Note the motile organ, the 

 flagellum. Where is it attached? What relation does it bear 

 to the gullet? How is it directed during locomotion of the 

 organism? Does it serve any other purpose besides locomo- 

 tion? (Minchin, p. 52.) 



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



