288 GENERAL SYSTEMATIC BACTERIOLOGY 



If organisms of this type are to be accorded generic recognition, 

 this genus name would appear to be vaHd. 



Denitromonas. A genus of bacteria proposed by Orla-Jensen 

 (1909, p. 314) for those organisms belonging to his family Lumini- 

 haderiaceae which show active denitrifying powers. The organisms 

 of this genus are usually fluorescent and differ from Ldquidomonas in 

 their lack of abUity to liquefy gelatin. The type species is Denitro- 

 monas fluorescens {Bacterium fluorescens nonliquefaciens) . The name 

 Denitromonas Orla-Jensen may be regarded as a synonym of Pseudo- 

 monas Migula and probably invalid. 



Enlows (1920, p. 36) states Bacillus denitrificans Burri and Stutzer, 

 to be the type. 



Desmobacteria. A tribe of bacteria proposed by Cohn (1872, p. 

 173) to include the two genera Bacillus and Vibrio. It comprises all 

 filamentous bacteria, which consist of elongated cyUndrical joints, 

 which multiply by transverse fission and which occur in longer or 

 shorter chains or filaments. The cells are not constricted at the 

 joints. The original description reads: 



AUe Fadenbacterian bestehen aus verlangerten cylindrischen Gliedern, welche, 

 wenn sie isolirt vorkommen, dem Bad. Lineola ahnlich sind, durch Quertheiling 

 aber vermehrt, sich zu langeren oder kiirzeren Ketten oder Faden aneinanderrei- 

 hen; diese Faden sind jedoch nicht an den Gelenken eingeschnlirt wie die Rosen- 

 kranzketten (Torulaform) der Oscillarien, an die sie sich zunachst anschliessen; 

 sie warden in diesem Zustand als Leptothrixfaden bezeichnet. Die Fadenbac- 

 terien bilden oft Schwarmern, nie aber, wie ich schon in einer Abhandlung von 

 1853 (Nov. Act. 1. c. p. 124) hervorgehoben, ZoogloeaGallert; doch wechseln auch 

 bei ihnen bewegliche und unbewegliche Zustande, je nach der Anwesenheit oder 

 dem Mangel an Sauerstoff, der Reaction des Mediums und andern noch 

 unerforschten Bedingungen; gewisse Arten scheinen nie bewegt zu sein 

 {Bacteridium Dav). 



This grouping was also used by Schroeter (1886, p. 170) as an order 

 with the families Leptotrichacei and Cladothrichacei. 



Hansgirg (1888, p. 229) also adopted this name for his first order of 

 bacteria. No description is given. The three families Cladothrichaceae, 

 Crenothrichaceae and Leptothrichaceae are included. 



With the spelling Desmohacteriaceae, this was used as a family name 

 by Benecke (1912, p. 188). This family he included in the order Des~ 

 mobacterinae. 



Desmobacteriaceae. A name proposed by Benecke (1912, p. 188) 

 for the single family of the order Desmohacterinae. This includes aU 



