564 DESCRIPTION OF FIGURES. 



Kg. 



secondary, primordial cells, which almost fill the 

 parent-cell. Their disposition resembles that of 

 JBotryocystis morum. Kg. 



39. — Incomplete division of an encysted zoospore into 

 four, also encysted secondary cells, which remain 

 connected in the centre after the removal of their 

 common enveloping cell. This seems to repre- 

 sent a further development of that given in 

 figure 25. 



40. — Division of an encysted cell into thirty-two minute, 

 spherical, entirely green, primordial cells, which 

 completely fill their delicate parent-cell. This 

 arrangement corresponds to the genus Sphceras- 

 trum tesserale. Kg., or to Uvella virescens, Ehr., 

 or to Syncrypta volvox, Ehr. 



41. — Zoospores from the last-described form escaped 

 from the parent-cell. One of them («) shows 

 the formation of a membrane around it. 



42. — An encysted zoospore with a spherical primordial 

 cell, the green, non-granular contents of which, 

 are retracted to one side, in a crescentic form, 

 whilst a colourless vesicle occupies the other half. 

 This modification appears to depend upon a 

 deficient supply of water. 



43. — A red cell, which, by desiccation, has become 

 colourless, showing grumous contents with oil- 

 globules. 



44. — A large red " still" cell, the contents of which are 

 divided into numerous (64 ?) segments. 



45. — A red encysted cell. 



46. — A red " still" cell, originating in the transition of 

 the cell represented in fig. 45 into the " still" 

 condition. 



47. — An encysted zoospore, treated with iodine and 

 sulphuric acid. 



5^ All the figures are magnified under a power of 



500 linear 



