304 GENERAL SYSTEMATIC BACTERIOLOGY 



teristic granules. No spores. Non-motile. Gram-positive. Does not produce 

 acid. Microaerophilic. Uusally parasitic. 



The type species is Erysipelothrix rhusiopathiae {E. porci), the causal organ- 

 ism of swine erysipelas. 



Winslow et al. (Committee Soc. Am. Bact., 1920, p. 198) emended 

 the diagnosis as follows: 



Rod-shaped organisms with a tendency to the formation of long filaments which 

 may show branching. The filaments may also thicken and show characteristic 

 granules. No spores. Non-motile. Gram-positive. Do not produce acid. 

 Microaerophilic. Usually parasitic. 



The type species is Erysipelothrix rhusiopathiae (Bacillus rhusiopathiae suis 

 Kitt 1893; Mycobacterium rhusiopathiae Chester 1901 ; Erysipelothrix porci Rosen- 

 bach 1909), the causal organism of swine erysipelas. 



Bergey et al. (1923, p. 371) follow the Committee and include the 

 genus as the fourth in the family Actinomycetaceae. 



Erjrthrobacillus. A generic name used by Fortineau (1905, p. 104) 

 for an organism, Erythrohacillus pyosepticus. This species is described 

 as a motile coccobacillus, but without flagella, without spores, staining 

 readily and gram negative. In culture it grew well at 37° but showed 

 pigment development best at 19° to 22°. In bouillon a distinct 

 clouding developed, and a delicate rose colored film. On agar a ver- 

 miUion mucus-like layer formed. Serum and gelatin were both Uque- 

 fied. In Uschinsky solution there was growth but no pigment pro- 

 duction. Ammonia, hydrogen sulphid and indol were formed, nitrates 

 reduced and sugar fermented feebly. Pigment was produced only 

 in presence of air. It was soluble in water, alcohol, slightly soluble 

 in chloroform and insoluble in ether, carbon disulphid and benzine, 

 and decolorized by alkaUes. 



Winslow et al. (Committee Soc. Am. Bact., 1920, p. 209) recognizes 

 this genus with the following diagnosis: 



Small aerobic bacteria, producing a red or pink pigment, usually a lipochrome. 

 Gram stain variable. It is possible that related yellow and orange chromogens 

 should be included here as well. 



Type species, Erythrohacillus prodigiosus (Ehrenberg) Committee. 



It is probable that the committee's designation of E. prodigiosus 

 is not valid, as this species was not mentioned by Fortineau. The 

 type is E. pyosepticus. Enlows (1920, p. 41) states: 



Type species (monotypy). E. pyosepticus. A motile "coco-bacille," with no 

 spores; flagella; Gram-negative; grows at 37°C., red pigment forms best at 19** 



