342 BACTERIOLOGY 



Potato. Growth yellowish white. 



Glucose bouillon. No gas. 



Milk. Not coagulated. Non-pathogenic. Strongly aerobic. 



Habitat. Soil. 



ADDENDA 



20. Microspira marina (Russell) 



B. marlnus Russell: Zeitsch. f. Hygiene, XI, 1891, 198, 



Morphology. Bacilli small, straight — curved — spirals. Motion rotatory and 



progressive. 

 Gelatin colonies. Small, radially striped, becoming liquefied and rougher, 



with flocculi in the liquefied gelatin. 

 Gelatin stab. A rapid liquefaction, the liquid gelatin turbid, and a thin» 



pellicle on the surface. 

 Agar slant. A moist whitish expansion, like pus. 

 Potato. Growth thick, waxy, spreading. 

 Bouillon, with sea water, turbid, with a smooth white pellicle. 

 Habitat. Isolated from sea water and sea mud. 



SPIRILLUM Ehrenberg 



Spirally curved or corkscrew forms of variable thickness. Endospores present 

 in a few species. Cells actively motile, and possess at one or both poles, 

 bundles containing four or more flagella. 

 I. Cell contents colorless — Euspirillum of Migula. 

 A. Grow in nutrient gelatin or other culture media. 



I. Aerobic, i.e. grow in the presence of atmospheric oxygen. 



a. Non-chromogenic ; do not produce pigment on gelatin or agar.. 

 * Cell plasma contains numerous black granules, very large spi- 

 rilla, 1.J-2.0 ft broad and 20-30 /x long. 



1 . Spirillum volutans Ehrenberg. 



** Cell plasma does not contain dark granules. Spirilla smaller, 

 f Gelatin liquefied, sometimes very slowly. 



§ Pathogenic to pigeons and guinea pigs. Comma-like.. 



2. Spirillum Massauah Kruse. 



§§ Terrestrial forms probably not pathogenic. 



3. Spirillum serpens (MUIler) Winter. 



4. Spirillum tenerrimum Lehmann-Neumann. 



