46 Synopsis of the Bacteria and Yeast Fungi. 



In stagnant bog-water and putrefying infusions. 



[This is often considered as an Infusorian. See Saville Kent's 

 "Manual of the Infusoria," p. 298.— Tr.] 



66. S. Cohnii, Warming {I.e., Resumd, p. 20). 



Cells flattened, but sometimes slightly angular, acutely 

 pointed at both ends, each with one 

 flagellum, with ij (seldom more) turn. 

 Spiral elongated, 6-9 times as high as 

 its diameter, 9-20 /a in height, i'2-3'5 

 ft. in diameter. Breadth of the cells 

 I •2-4 ju,. Colourless, often with one 

 or two longitudinal striations. (Fig. 



44-) 

 Fig. i,i,.—stirom<mas In Stinking, very much decomposed 



Cohnii^ X 660 (after 

 Warming). Water. 



XIV. SPIRILLUM, Ehrenberg {Abhandl. Berlin. 

 Akad., 1830, p. 38). 

 ( Vibrio, Cohn ; Ophidomonas, Ehrenberg.) 

 Cells cylindrical or slightly compressed, simply arcuate 

 or spirally twisted, rigid, with a flagellum at each end (? 

 whether in all species). Multiplication by transverse 

 division, the daughter-cells for the most part soon separat- 

 ing. At times also a zoogloea is formed. Spore-formation 

 similar to that of Bacillus. 



I unite with the genus Spirillum, the Vibrio of Cohn, and the 

 Ophidomonas of Ehrenberg. The genus Vibrio, in fact, cannot be 

 sharply defined, since flagella have also been found in it. Cohn him- 

 self has already united Ophidomonas with Spirillum. Warming also 

 combines all three genera. Although the name Vibrio has priority, 

 still I have preferred the designation Spirillum, because gross misuse 

 has been made of the former, especially by non-botanists, so that it is 

 better to let it lapse altogether. 



