DESCRIPTION OF FIGURES. 563 



Fig. 



deliquescence. The primordial cell is resolved 

 into green and red granules, forms clear vacuoles, 

 and is on the point of filling up the enveloping cell. 



28. An encysted zoospore which has deliquesced; the 

 primordial cell has entirely filled the " enveloping 

 cell," and become resolved into green and red 

 granules. 



29. An encysted zoospore, which has passed into the 

 " still" condition ; the spherical, wholly green, 

 primordial cell, has acquired a closely investing 

 cellulose coat, whilst the " enveloping cell," has 

 become resolved into a muccid substance, on 

 which the cilia are no longer visible. 



30. Division of a " still" cell into two elliptical secondary 

 cells, which present a nucleus in the centre, and 

 remain enclosed by the parent cell, become gela- 

 tinous. (Vide fig. 7.) 



31. Division of a " still" cell into eight : the parent cell 

 is resolved into a gelatinous substance, and 

 encloses eight small, cylindrical, red zoospores. 



32. Two of these zoospores after their escape. 



33. Yellow-green " still" cell, with gelatinous envelope. 



34. An encysted zoospore, the primordial cell of which 

 is on the point of division into two. The remote, 

 enveloping cell supports the two cilia, whose 

 presence is only indicated by the current they 

 produce. 



35. An elliptical encysted zoospore, the primordial cell 

 of which is already divided into two secondary 

 cells. The vibratile cilia and transparent pro- 

 jections upon which they are placed, are visible 

 within the parent-cell. 



36. One of the secondary cells after its liberation. 



37. Division of an encysted cell into four; the globular, 

 green, granular, secondary cells, almost fill the 

 parent-cell ; arranged something like the cells in 

 Gonium pectorale. 



38. Division of an encysted zoospore into eight globular, 



