SYSTEMATIC AND DESCRIPTIVE. 



325 



Beggiatoa roseo-persicina (Cohnia roseo-persi- 

 cina. Bacterium rufescens, or Peach -coloured bacterium , 

 Lankester). Cocci, rods, spirals, and threads (Fig. 



FIG. 126. BEGGIATOA ALBA. 



A. Threads, at base distinctly linked, partly spiral. B. A thread, spiral in 

 its whole length. C, D. Fragments detached from threads ; immotile. 

 E. Active spirillum-forms, with a flagellum at either end. F. G. Thin 

 and short spiral forms. H. A spiral showing the individual links. X 

 540. [After Zopf.] 



127). The cocci, globular or oval, reach 2-5 p. in 

 diam. They form at first solid families, bound to- 



