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 



c-.vac 



FIG. 2<>S. Eiif/lena viriilis, a lash-animalcule. A-D, four views illustrating 

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

 line of anterior end further enlarged ; G, resting stage ; cy, cyst ; .//, liagel- 

 huu ; m, mouth; nu, nucleus; w, gullet; pg, pigment spot; /, 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 



FIG. 209. -- Volvox globator. t ] ie wa t e r (Fig. 209). 

 Much magnified. Photo. Y, .'.. 



of the living animal. Very different in habitat irom 



1 From volvere, to roll. 



