278 GENERAL SYSTEMATIC BACTERIOLOGY 



reason why I am now inclined, in contrast to my earlier opinion, to consider the 

 coli-and aerogenesbacteria as two different genera, is because they differ not only 

 in morphologcal, but, as later researches have shown, also in biological respects. 

 I have myself proved (1914) that the Aerogenesbacteria completely oxidize the 

 carbohydrates when the nutrient matter offers a sufficient buffer effect, and they 

 thus correspond with their name in forming more gas than do other bacteria, and 

 Rogers, Clark and Davis (1914), have shown that in the gas developed by the 

 Colibacteria there is proportionately more hydrogen than in that developed by 

 the Aerogenesbactei ia. 



Conidiothrix. A name suggested by Benecke (1912, p. 489) as a 

 generic designation. In a discussion of the work of Ellis on the iron 

 bacteria, he says: 



Es leuchtet ein, dass diese Form von der Leptothrix ochracea, wie sie oben 

 beschrieben worden ist, ganz ausserordentlich abweicht. Ich mochte fiir den 

 Fall, dass die Richtigkeit der Beschreiben sich auch spater hin bestatigen soUte, — • 

 was vorlaufig recht zweifelheft, erscheinen muss, den Namen Conidiothrix fiir 

 sie vorgeschlagen. 



The suggestion has apparently not been adopted by other authors. 

 It may be regarded as a synonym of Leptothrix. 



Coniothecium. According to Trevisan (1879, p. 144) the name 

 Coniothecium syphiliticum was given by HaUier to an organism which 

 he regarded as causing syphilis. Loeffler (1886, p. 143) quoted several 

 paragraphs from an article by HaUier (1868, p. 327) in which he men- 

 tions this organism. 



The organism evidently wa* so inadequately described that the 

 name is probably invalid. 



Comilia. A genus described by Trevisan (1889, p. 21) as the 

 seventh of the tribe Bacillee. The description reads '^Baculi con 

 protoplasma uniformcmente diffuso. Spore macrosome provenienti 

 nelle parti mediane intumescenti, di regola non mai nelle estremita, 

 di baculi norma]: immutati." Two subgenera are included, Eucornilia 

 and Pleurospora. Fourteen species are listed, the first being Comilia 

 alvei (Bacillus alvei Flugge) . De Toni and Trevisan (1889, p. 998) give 

 the following diagnosis: "Bacuh plasmati uniformiter diffuse foeti. 

 Sporae (endosporae macrosomae) in partibus medianis tumefactis 

 baculorum normalium immutatis exorientes numquam (in baculis) 

 apicales." 



Two subgenera are included, Eucornilia with sixteen species and 

 Pleurospora with two. 



What species should be regarded as the type is uncertain. It is possi- 

 ble that it should be Comilia Pasteuri, the name given by Trevisan to 



