GENERAL SYSTEMATIC BACTERIOLOGY 529 



siderable variation in characters for the strains termed by them Bacillus histo- 

 lyticus. 



Welchillus. A generic name proposed by Heller (1922, p. 18) with 

 the following description: 



Clostridioideae that liquefy gelatin but do not produce hj'drogen sulfid de- 

 monstrable by lead-acetate-paper test in blood-broth. They produce much acid 

 and gas on meat medium, but they do not digest it, nor do they digest casein, 

 coagulated serum, or egg-white. They produce stormy fermentation of milk 

 and attack many sugars vigorously. Their multiplication is extraordinarily 

 rapid; they are killed by their own growth products in acid media, in which 

 they fail to sporulate. Deeply Gram-positive non-flagellate rods with square 

 ends. The}' produce oval subterminal or median spores in alkaline media, or 

 in media free of fermentable carbohydrates; these spores do not bulge the sides 

 of the bacilli. When growing rapidly the rods are very short, and resemble 

 closelj' no other type here listed except Stoddardillus. When growing slowly 

 the rods are less abundant and longer, and may be mistaken for Martellillus 

 and similar organisms. Typically intestinal saprophytes; ubiquitous. Many 

 strains produce toxin and invade tissue, forming gas, and causing the forma- 

 tion of oedema, and in many cases causing the disintegration of muscle 

 and of connective tissue without the production of a foul odor. This dis- 

 integration occurs only in vivo, and is probably due to the enzjTues of the host 

 tissue. Welchillus are the most frequent anaerobic invaders noted on the hospital 

 autopsy table. The organisms are present in human intestines. Causative agents 

 of a probably greatly overestimated percentage of gas gangrene cases following 

 war wounds. Comparatively rare as animal invaders. 



Type species W. aerogenes {Bacillus aerogenes-capsulatus Welch and Nuttall) 

 type I as defined by Simmonds (type IV of Esty). Ferments besides other car- 

 bohydrates, inulin and glycerol. Usually pathogenic for guinea pigs. 



Wesenbergus. A generic name proposed by Castellani and Chal- 

 mers (1919, p. 934) for the eighth genus of the tribe Ebertheae with the 

 following description: 



Ebertheae which ferment glucose completely and lactose partially producing 

 acid, but no gas. Milk not clotted. 



Type species. Wesenbergus wesenbergi Castellani, 1913. 



Winogradskya. A generic name proposed by Trevisan (1889, p. 

 12). De Toni and Trevisan (1889, p. 1028) give the following descrip- 

 tion: "BacuH cylindracei et filamenta aggregata in familias zooglaei- 

 cas repetite ramosas, capsula tenui gelatinosa inclusa. Sporae 

 ignotae." 



One species is included. Winogradskya ramigera (Itzig). Trev. 

 This is the Zoogloea ramigera Itzigsohn. 



The genus is probably not tenable. 



