62 GENERAL SYSTEMATIC BACTERIOLOGY 



b. Dichotomously pseudobranched; lophotrichous cylindric gonidia. 



Cladothrix Cohn 

 II. Filaments slowly moving, without sheath. Containing sulphur. 



'iaoa Trev. 



During this year the name Thiophysa was given by Hinze (1903) 

 to a new genus of the sulphur bacteria ; and Troili-Petersson named the 

 lactic acid rods Brachybacierium. 



Migula in 1904 again outlined his classification promulgated in 

 1900 and vigorousl}^ defended it from the criticisms that had been made 

 against it. New genera described during the year were Hypnococcus 

 (Bettencourt, Kopke, Renzende and IMendes) for an organism found 

 associated with sleeping sickness, Clonothrix (Schorler) for one of the 

 iron bacteria, and Thiobacillus (Beijerinck) for organisms which could 

 reduce nitrates, oxidize sulphur and utilize CO2 in the manufacture of 

 plant food. 



Winslow and Rogers (1905) as the result of a careful study of many 

 types and races of the cocci made some rather radical rearrangements 

 of the groups, and created the new subfamilies Paracoccaceae and 

 Metacoccaceae. New genera were Aurococcus, Alhococcus and Rhodo- 

 coccus. This classification was later further elaborated and published 

 in 1910. A key to the families and genera recognized will be found 

 under that year. 



One of the most comprehensive analyses of the classification of bac- 

 teria which has been published in English is that of Erwin F. Smith 

 (1905) in the first volume of his Bacteria in Relation to Plant Diseases. 

 For his family and generic names he follows Migula (1900) consistently, 

 except for several genera for which he substitutes older names. The 

 genus Pseudomonas he concludes is a synonym of Bacterium Cohn. 

 For Bacterium of the Migula system he proposes Aplanobacter, The 

 geaus Microspira Schroeter he concludes is a synonym of the older 

 Vibrio. Furthermore he recognizes as a third order coordinate with 

 Eubacteria and Thiobacteria the order Myxobacteria. His key to the 

 genera of the Myxobacteria follows: 



Smith's Classification of the Myxobacteria (1905) 



III. Order Myxobacteria: Motile rod-like organisms, multiplying by fission, 

 secreting a gelatinous base, and forming pseudoplasmodium-like aggrega- 

 tions before passing into a more or less highly developed cyst-producing 

 resting stage, in which the rods become encysted in groups without modifi- 

 cation, or may be converted into spore masses. 



