230 GENERAL SYSTEMATIC BACTERIOLOGY 



characters of the genus, however, is of course regarded as overweighing 

 the loss of a character which is generally emphasized as of great 

 importance. 



Strict application of the code would seem to necessitate the desig- 

 nation of Bacterium triloculare Ehrenberg as the type. Certainly, then, 

 the designation of a more recently described species as the type would 

 seem to require international sanction. Probably the best solution will 

 be to adopt the suggestion of Breed, Conn and Baker, and not attempt 

 to include the genus in our classifications until the original species can 

 be recognized. This seems to have been followed by Castellani and 

 Chalmers (1919) and Bergey et al. (1923) and may perhaps be recog- 

 nized as a general tendency due to the advisability of splitting the 

 unwieldy colon-typhoid series of bacteria into a number of genera. 



Bacterius. A genus of bacteria proposed by Kendall (1902, p. 484) 

 to include those rod-shaped bacteria which are motile, but on which the 

 distribution of fiagella is unknown. He states that this group would 

 disappear as knowledge of the flagellation becomes more complete. 

 The name has never come into use, and has not been applied to a species. 

 It may be regarded as invalid. 



Bacteroideae. A tribe (the sixth in the family Bacillaceae named by 

 Castellani and Chalmers (1919, pp. 932, 9.59)) with the single (type) 

 genus Bacteroides. 



The tribal definition is : 



Bacillaceae with good growth on ordinary laboratory media, without endo- 

 spores, fluorescence, or pigment formation, and obligatory anaerobes. 

 Type Genus. Bacteroides Castellani and Chalmers, 1918. 



These authors again use this name in 1920 (p. 601). 



Bergey et al. (1923, p. 255) recognizes this as the ninth tribe of the 

 family Bacteriaceae with the following description: "Motile or non- 

 motile rods, without endospores. Show good growth on ordinary cul- 

 ture media; without pigment formation. Obligatory anaerobes." 



One genus, Bacteroides is included. 



Bacteroides. A generic name proposed by Castellani and Chalmers 

 (1919, p. 959), for the sole genus of the tribe Bacteroideae, with the 

 following description: 



Definition. Bacteroideae with the tribal characters. 

 Type Species. Bacteroides fragilis Veillon and Zuber. 



The type is found in abscesses from various parts of the body. Another species 

 is the well-known Bacteroides hisiformis of Le Dantec and Vincent, found in 



