50 NORMAL HISTOLOGY. 



GREEN EUGL^INA, 



Green Euglsena is a unicellular animal which possesses chloro- 

 phyl, secures its motion by means of flagella, and reproduces b^ 

 normal fission. 



Classification: 



Kingdom Animal. 1 



Series Protozoa. 



Sub-kingdom Protozoa. 

 Class Infusoria, 



Order Flagellata. 



Genus Euglsena. 



Species Euglcena viridis. 



Life History and Morphology. Euglwna viridis is an interesting 

 animal because of the fact that its cell- wall is composed of cellulose 

 and because it possesses chlorophyl. The cell is fusiform in shape, 

 and is provided with cell-wall, mouth,, flagellum (extending from 

 an anterior depression), an eye spot of red pigment situated near 

 the mouth,, and protoplasm, chloroplasts, and nucleus. It has a 

 rotary motion. Fission takes places in a longitudinal direction in- 

 stead o'f transversely, as with the Slipper Animalcule. 



Habitat. The Green Euglsena may be found in damp soil, in 

 sewerage, and upon the surface of stagnant water. 



Laboratory exercise No. 11. Green Euglaena. Obtain some Green 

 Euglsena, preferably from the surface of water. Examine with the 

 high power. Make out carefully the structures mentioned above. Do 

 you find any evidences of cilia? In what two respects does Euglaena re- 

 semble a plant? What is your conclusion as to its nature? Drawings. 



