GENERAL SYSTEMATIC BACTERIOLOGY 501 



Benecke (p. 442) makes Thermobacterium Zeidleri a sjaionym of 

 Bad. acetigenum. 



As a generic name Thermobacterium was proposed by Orla-Jensen 

 (1919) for the thermophilic lactic acid organisms. The first species 

 mentioned is Thermobacterium bulgaricum. In addition he names 

 Thermobacterium cereale, and Thn. lactis. It would seem that this 

 is a synon\Tn of Lactobacillus. Probably the type species may be 

 designated as Thermobacterium bulgaricum Orla-Jensen, 



Thiobacillus. A generic name used by Beijerinck (1904, p. 593) 

 for organisms oxidizing sulphui', but not containing sulphur granules 

 or bacteriopurpurin. The first species named, Thiobacillus thioparus 

 oxidizes H2S, Na2S406 and other sulphur compounds for energy, and 

 is oligocarbophilous, utilizing carbonates. The organism is motile 

 and sporeless. The second species Thiobacillus denitrificans when 

 grown in the presence of free sulphur, carbonates and nitrates, reduces 

 the last with evolution of free nitrogen, oxidizes the sulphur and utilizes 

 the inorganic carbon. 



Other species of Thiobacillus have been described by other workers 

 as Waksman and Joffe (1922, p. 239) who named Thiobacillus thio- 

 oxidans. 



Apparently the genus is valid, and the type species Thiobacillus 

 thioparus Beijerinck. 



Bergey et al. (1923, p. 37) include the genus as the seventh in the 

 tribe Nitrobactereae with the following description : 



Small rod-shaped organisms deriving their energy from the oxidation of sul- 

 fides, thiosulfates or elementary sulfur, forming sulfur, persulfates, and sulfates 

 under acid or alkaline conditions and deriving their carbon from carbon dioxide 

 or from bicarbonates and carbonates in solution. 



The type species apparently is Thiobacillus thioparus Beijerinck, 



Thiobacteria. An ordinal name introduced by Migula (1900, p. 

 1039) to include the sulphur bacteria. The diagnosis given is: "Z^llen 

 ohne Centralkorper, aber Schwefeleinschlusse enthaltend, farblos oder 

 durch Bacteriopurpurin rosa rot oder violett gefarbt, niemals griin." 

 This order is recognized by E. F, Smith (1905, p, 162), Frost (1911, 

 p. 60) and others, 



Vuillemin (1913, p. 522) excludes the entire group from the bacteria 

 with the statement that it belongs with the Schizophyceae. 



Thiobacteriaceae. A family of the order Cephalotrichinae created 

 by Orla-Jensen (1909, p. 303) for organisms which contain sulphur but 



