GENERAL SYSTEMATIC BACTERIOLOGY 195 



It is probable that Azotobacter Beijerinck may be regarded as a valid 

 genus. 



Azotobactereae. A tribe of the Nitrobacteriaceae suggested by Wins- 

 low et al. (Committee Soc. Am. Baet., 1920, p. 203), to include the 

 "nitrogen fixing bacteria." The genera Rhizohium and Azotobacter 

 were included. Bergey et al. (1923, p. 38) include this as the second 

 tribe of the family Nitrobacteriaceae. Probably the spelling should be 

 emended to Azotobacterieae. 



Azotomonas. This generic name was proposed by Orla-Jensen (1909, 

 p. 484) to replace the older name Azotobacter Beijerinck (1901, p. 561) 

 to conform to his rule that organisms with polar flagella should bear 

 generic names terminating in -monas. It should be regarded as invalid 

 because of the priority of Azotobacter. 



Babesia. A genus of bacteria created by Trevisan (1889, p. 29) 

 to include two species of cocci, one associated with yellow fever and 

 described by Babes (1883,) and the other with erysipelas 

 chronica. It was included as the fourth genus of his tribe Strepto- 

 coccee. The diagnosis given by De Toni and Trevisan (1889, p. 1054) 

 is as follows : 



Cocci ellipsoidei, longitudinaliter binatim seriati (diplococci longitudinales) 

 in filament a moniliformia, pseudodichotoma nuda (i.e., nee capsulis nee vaginis 

 obducta) concatenati. Arthrosporae macrosomae in apice filamentorum 

 obvenientes. 



The genus is differentiated from Streptococcus by the pseudodichot- 

 omous branching of the filaments and by the production of arthrospores 

 at the ends of the filaments. The generic description corresponds with 

 that of no organism at present known. The two species, B. xanthopy- 

 retica Trev. and B. erysipeloides Trev. were so inadequately described 

 as not to be recognizable. The genus name has never come into use. 

 It may be regarded as invalid or possibly as a synonym of Streptococcus 

 (Erwin F. Smith 1905, p. 174). 



Babesia xyanihopyretica Trev. {Streptococcus xanthopyreticus Trev.) 

 may be regarded as the type. 



Babesia is also used as a generic name in the pathogenic protozoa. 



Bacillaceae. A family proposed by Fischer (1895, p. 139) with the 

 spelling Bacillacei and with the following diagnosis : 



Vegetationskorper einzellig, gerade mit ausgesprochener Langsachse, bald 

 kurz ellipsoidiseh, bald gestreckt stabchenformig : Theilung immer in derselben 

 Richtung, senkrecht zur Langsachse mit oder obne Kettenwuehs und Bewegung. 

 Sporen theils endospor, theils arthrospor. 



