226 



ZOOLOGY 



color to the pools of water it inhabits. It is spindle- 

 shaped, and" bears a flagellum at its anterior end. At the 

 base of the flagellum is a red "eyespot." 



Allied to Euglena is Volvox, 1 a spherical, multicellular 



FIG. 208. Euylena virldis; a lash-animalcule. A-D, four views illustrating 

 the characteristic movements ; E and H, enlarged views of adult ; F, out- 

 line of anterior end further enlarged ; G, resting stage ; cy, cyst ; fl , flagel- 

 lum; m, mouth; nu, nucleus; <e, gullet; pg, pigment spot; r, reservoir. 

 After Kent and Klebs. 



organism, half animal and half 

 plant, and forming a sort of con- 

 necting link between the Pro- 

 tozoa (or one-celled animals) and 

 the multicellular higher organ- 

 isms. Volvox occurs abundantly 

 in our ponds and gets its name 

 from its manner of revolving in 

 the water (Fig. 209). 



Very different in habitat from 



FIG. 209. Volvox ylobator. 

 Much magnified. Photo, 

 of the living animal. 



1 From volvere, to roll. 



