GENERAL SYSTEMATIC BACTERIOLOGY 251 



Smith (1905, p. 161), EUis (1909, p. 7) Clements (1909, p. 7) and 

 Frost (1911, p. 59). 



Vuillemin (1913, p. 526) places this family among the Schizophyceae 

 and not among the bacteria. 



Buchanan (1918, p. 301) and Bergey et al. (1923, p. 390) included 

 this as the only family of the order Chlamydohacteriales q.v. Five 

 genera were listed, Leptothrix, Didymohelix, Crenothrix, Sphaerotilus 

 and Clonothrix. 



Castellani and Chalmers (1919, p. 924) list this as the fourth family 

 of the order Eubacter tales. 



It should be noted that this name does not conform to the nomen- 

 clatural rule that the name of a family should be fashioned from one 

 of the constituent genera. 



Chlamydohacteriales. A name proposed by Buchanan (1917, p. 

 162) for the second order of the class Schizomycetes. The description 

 given follows (1918, p. 301) : 



Filamentous bacteria, alga-like, typically water forms, frequently sheathed, 

 without true branching although false branching may be present. The sheath 

 is frequently impregnated with iron. Conidia may be developed, but never endo- 

 spores. Sulphur granules or bacteriopurpurin never present. Mature cells or 

 filaments not motile, not protozoan-like. 



The order contains a single famil}^ Chlamydohaderiaceae. 



The name was accepted by Winslow et al, (Committee Society of 

 American Bacteriologists (1917, p. 551)), and by Bergey et al. (1923, 

 p. 390). 



Chlamydobacterinae. A variant of Chlamydohaderiaceae used by 

 Schmidt and Weis (1902, p. 375) as a family name. 



Chlamydothrix. A genus name proposed by Migula (1900, p. 1030) 

 to replace the name Streptothrix previously used by this author, and 

 to include the two species commonly known as Leptothrix ochracca 

 Kiitzing and GalUonella ferruginea Ehr. 



Fischer (1903, p. 61) used the followmg description: "Nicht fest 

 gewachsen, schwarmende Cylindergonidien, Beispiel: Chi. ochracea." 



The genus is characterized by Smith (1905, p 162) as follows: 



Cells cylindric, non-motile, arranged in unbranched threads, with a sheath of 

 varying thickness. Frequently the septation of the threads is only demonstrable 

 after the use of reagents. Reproduction by means of non-motile roundish or 

 ovoid conidia, which arise directly from the vegetative cells. Synonyms: Strep- 

 tothrix (Cohn) Mig., Leptothrix Kutz. ex. p. and GalUonella Ehrenberg. ex. p. 



