ZTOOPSTTA. ' 



117 



and divides itself into sixteen cells, which then constitute 

 a new colony similar to that with which we started {A, 

 Fig. 50). 



243. The Water-Net (Hydrodictyon) is one of the most 

 curious of the common plants of pools and slow streams in 

 midsummer. Well-grown specimens are froni 20 to 30 

 centimetres long (8-12 inches), and consist of an actual net 

 made of cylindrical cells joined at their ends. The whole 



¥ia. 50.—^, a colony of Fandorina morum; C, sexual cells escaping; E, F, G, 

 union of sexual cells; H, resting spore. All nighly magnifled. 



-net is a colony, and the general mode of reproduction re- 

 sembles that of Pandorina. 



244. New colonies are formed also directly by the proto- 

 plasm of a cell first breaking up into a great number of 

 small ones (by internal cell-formation), and then these soon 

 arrange themselves into a miniature net inside of the old 

 cell-wall. The old wall eventually decays and sets free the , 

 new colony. 



245. In the common Water-Flannel (Cladophora) of our 



