GENERAL SYSTEMATIC BACTERIOLOGY 283 



has been confusion as to the correct specific name. Migula (1900, p. 

 1033) notes that he examined the exsiccatti of Rabenhorst's Lepiothrix 

 Kuhniana (Algens Sachsens No. 284), but that it contained no organ- 

 isms of the tj^pe of Cohn's Crenothrix polyspora, but a mixture of 

 Leptothrix ochracea and GalUonella ferruginea. Zopf's use of the 

 name Crenothrix Kuhniana he considers invahd. 



Buchanan (1918, p. 305) included this genus as the third in the 

 family Chlamydobacteriaceae with the following description: 



Filaments unbranched, showing differentiation of base and tip, attached, 

 usually thicker toward the tip. Sheaths plainly visible, usually colorless, brown- 

 ish from iron o.xid in old filaments. Cells cylindric to spherical. INIultiplication 

 by non-motile, spherical, conidia; cells dividing in 3 planes to form conidia. 



The type (and only) species is Crenothrix polyspora Cohn. 



This description is also followed by Bergey et al. (1923, p. 392). 



Crenotrichaceae. A family named by Hansgirg (1890, p. 20) for 

 a group of Mycophyceae, including the genus Crenothrix. 



Crenothriceae. A tribe of the family Trichogenae proposed by 

 De Toni and Trevisan (1889, p. 925) with the following diagnosis: 

 "Sporae (arthrosporae) in specialibus filamentorum partibus (pseudo- 

 sporangiis) obvenientes. Filamenta simplicia, basi ab apice superior 

 distincta, vaginata." 



Crenothrix was the only genus included. 



Cristispira. A genus of spirochetes proposed by Gross (1910, p. 

 44) to include those forms found in the crystalline style of mussels. 

 The body of the organism is circular in cross section, more or less 

 spirally wound and possessing a longitudinal "comb" or "crest" which 

 does not extend quite to the end. This crest has been compared to 

 the undulating membrane of the trypanosomes, though Gross does 

 not consider them to be homologous organella. Gross states that 

 the organism is divided by cross walls into separate chambers or cells. 

 His generic diagnosis (p. 89) reads: "Spironemacea mit spiralig gebo- 

 genem Korper und Crista. Theilung durch einfache Durchschniirung 

 oder Ausbildung einer Scheidewand, meist mit vorhergehender In- 

 curvation." Two species are described C. veneris and C. interraga- 

 tionis. 



This name is used as a subgeneric designation bj' Doflein (1911, 

 p. 356). It is recognized as a vaUd genus b}^ Dobell (1911, p. 536) 

 and by Gonder (1914, p. 678). The latter author summarizes the 

 conclusions of various writers relative to the morphology of the or- 

 ganisms belonging to this genus. 



