RHODO-THIOBA CTERIA 



165 



The growth of the zoogloea sometimes resulted in masses being 

 formed which w^ere several hundred microns in diameter. 



The cells are presumed to divide in three planes by analogy 

 with the comparable genus Aphanocapsa (one of the Chroococ- 

 cacece) which was stated by Nageh to undergo " division 

 alternately in all directions of space, in the successive genera- 

 tions." 





9^ 



Fig. 41. — Thiocapsa roseo-persicina. X 2000. 



Genus 2. — Thiocystis (Winogradsky), 

 Literature.— Wmogradsky (2), 1888 ; Migula (3), 1897 ; 



Bergey, 1923 ; Bavendamm, 1924. 

 Families of small cocci enclosed in slime. When the slime 

 disappears the cocci assume motility, and either separate and 

 swim away, or enter once more into the zoogloea condition. 

 In the former case, only a portion of the slime is liquefied, 

 sufficiently to permit the cocci to escape. 



Fig. 42. — Thiocystis violacea. X 500. 



Thiocystis violacea (Winogradsky). 



Cells round, 27 — S-lfi in diameter, light rose-red or violet 

 in colour. Slime thick (Fig. 42). 



Thiocystis rufa (Winogradsky). 



Cells round, not greater than Ifx. Thick slime covering ; 

 cells deep violet-red, and occasionally black with sulphur 

 grains. 



