GENERAL SYSTEMATIC BACTERIOLOGY 495 



containing sugars, which are as a rule fermented with acid production, but rarely 

 gas. Usually do not liquefy gelatin or reduce nitrates. No formation of zo- 

 ogloeal masses in sugar solutions. 



The type species is probably StrejAococcus pyogenes Rosenbach. 



Winslow et al. (Committee Soc. Am. Baet., 1917, p. 558 and 1920, 

 206) also include it in Streptococceae with the following description: 



Chiefly parasites. Cells normally in short or long chains (under unfavorable 

 conditions, sometimes in pairs and small groups, never in large packets). Gener- 

 ally stain by Gram. Capsules rarely present, no zoogloeal masses. On agar 

 streak, effused translucent growth, often with isolated colonies. In stab culture, 

 little surface growth. Many sugars fermented with formation of large amount of 

 acid, but inulin is rarely attacked. Generally fail to liquefy gelatin or reduce 

 nitrates. 



Type species is Streptococcus pyogenes Rosenbach, 



Castellani and Chalmers (1919, p. 927) give the following descrip- 

 tion: 



Streptococceae parasitic in short or long chains or pairs, forming a large quan- 

 tity of acid in fermented sugars. Haemolysis present or absent. Without charac- 

 teristic group serum reactions. 



Type species. Streptococcus erysipelatos Fehleisen, 1883. 



Bergey et al. (1923, p. 46) follow the Committee. 



The generic designation Streptococcus Rosenbach (not Billroth) 

 would appear to be valid, with Streptococcus pyogenes Rosenbach as 

 the type. The genus is proposed as a genus conservandum by Vuille- 

 min (1913, p. 525). 



Streptokokken. A variant of Streptococcus used by certain German 

 writers, as Baumgarten (1890, p. 127). 



Streptokokkus. A variant spelling of Streptococcus used by various 

 German writers as Hoieppe (1891, p. 30). 



Streptomicrococcos. A name applied by Billroth (1874, p. 11) to 

 a growth form of his pleomorphic Coccohacteria septica in which the 

 cells appeared as small spheres, in chains. It is not a generic 

 name. 



Streptospirillum. The name given by Billet (1890, p. 24) to a form 

 genus for those spiral rod shaped bacteria which occur in chains. It is 

 not a valid generic designation. 



Streptothrix. A generic name introduced by Corda (1839, p. 27) 

 for one of the Hyphomycetes. The single species described, Strepto- 

 thrix fusca, was also figured. This species has been repeatedly figured 

 and described in floras. The description given by Saccardo (1886, 



