EXPLANATION OF PLATE Y^contintied. 



Fig. 16. — Case in which young cysts are very unequal and dissimilar. 



Fig. 17. — Specimen which appears to have originally contained four 

 cysts, of which three are empty, their contents having apparently wandered 

 off, while the fourth has resumed growth within the former limiting wall. 

 Two of the empty cysts are united to the parent wall. 



Fig. 18. — Specimen containing two unequal cysts. 



Fig. 19 a. — Another in which the coloured protoplasm has contracted 

 itself into a sphere, leaving a smaller, almost empty, and colourless cyst 

 free. 6, specimen containing in its interior a peculiar double cyst, this 

 time deeply coloured. 



Figs. 20, 21, and 22. — Specimens of which the history is recorded with 

 extreme clearness in their cellulose walls. In Fig. 21 are to be seen small 

 cysts, this time tinged red. Compare Figs. 19 a, 19 b, 23 a, 23 b. 



Fig. 23 a. — Adult cyst, from which contents have been expressed, show- 

 ing curious warts formed by the deposition of cellulose over particles of 

 red colouring matter, b, the smallest form in which a wart was observed. 



Fig. 24. — Adult cyst, containing warts of which the laminated structure 

 is clearly visible. This individual has also enclosed at an early period a 

 filamentous alga, round which it has deposited an extremely thick coating 

 of cellulose. 



Fig. 25. — Young Chlamydomyxa entwined by parasitic hypha. 



