FLAGELLATE PROTOZOA (MASTIGOPHORA) 



267 



188 (189) Colony ellipsoidal or spherical with cells reaching toward the center. 



Pandorina Bory de Saint Vincent. 

 Representative species. 



Pandorina morum Bory de Saint Vincent 1824. 



Cells sixteen or thirty-two; enclosed within a definite 

 membrane which does not touch the surface of the indi- 

 viduals. Each cell bears two long flagella. 



Fig. 446. Pandorina morum. cv, contractile vacuole; 5^ stigma. 

 X 250. (After Piingsheim.) 



189 (188) Colony ellipsoidal with sixteen cells in four rows around a longi- 

 tudinal axis. Each cell bears four ilagella. 



Spondylomorum Ehrenberg. 

 Representative species. 



Spondylomorum qualernarium Ehrenberg 1848. 



Reproduction occurs by the cells of the colony separating and 

 each individual building up a new colony by cell division. 



Colonies often produced in large numbers in pond water. 

 Movements rapid, rotating on the long axis. Green in color. 

 Very favorable conditions are necessary in order that the flagella 

 may be seen and counted. 



Fig. 447. 



Spondylomorum qualernarium. n, nucleus; 0, stigma. 

 X 6cx). (After Stein.) 



190 (187) Colonies with cells not crowded together and not reaching toward 



the center 191 



191 (194) Colonies spherical, ellipsoidal, or flattened, with cells uniform in 



size 192 



192 (193) Colony spherical or ellipsoidal; poles not differentiated by ar- 

 rangement or size of cells. No tails present. 



Eudorina Ehrenberg. 

 Representative species. . . Eudorina elegans Ehrenberg 1831. 



Cells sixteen, thirty-two, or sixty-four; arranged around the 

 periphery of the jelly mass but not in contact with each other. 

 Each cell bears two flagella. 



Fig. 448. Eudorina elegans. X 250. (From a specimen.) 



