632 GENERAL SYSTEMATIC BACTERIOLOGY 



Long rods occurring in evenly curved chains. Gram positive. Motile. 

 Proteus-like growth on media. Facultative anaerobes. Carbohydrates and 

 gelatin not attacked, hydrogen sulphide not formed. 



Type species, Z. zopfii (Kurth) Wenner and Rettger. 



Bergey et al. (1923, p. 193) include this genus in the tribe Zopfeae. 



Apparently this name is an exact synonym of Kurthia which has 

 priority. Both are based on the same type species. 

 1 Zygobacterium. According to De Toni and Trevisan (1889, p. 

 1023) this generic name was used by Maggi (1887, p. 318) for the 

 species Zygobacterium nitrosum which is regarded by the former as a 

 synonym of Bacterium lineola (Mueller) Cohn. 



Zymosotis. A generic name proposed by Salisbury (1868). Enlows 

 (1920, p. 99) gives the following summary: 



Z. regularis. Spores very minute well defined in outline, and uniform in size 

 and shape. Multiply by duplicate segmentation, and develop into filaments 

 with great rapidity. Filaments are well defined, uniform in diameter, and have 

 cross markings or interruptions in the inside tubular membrane at regular inter- 

 vals, hence its name. Found in human blood. 



Z. escularis. The filaments in their early stages of development are mostly 

 moniliform. The more mature filaments have the outside tube continuous and 

 uniform in diameter, while the inside membrane has not only interruptions at 

 irregular intervals, but the interruptions are of variable length. Where the 

 inside membrane occurs it affords a double wall to the tube and communicates 

 greater opacity than have the intervening spaces. Found in the freshly drawn 

 blood of horses affected by a fatal disease characterized by a remittent fever. 



