GENERAL SYSTEMATIC BACTERIOLOGY 79 



Vuillemin also proposed that the following names be kept as " Form- 

 ogenera conservanda," but without nomenclatural status, Micrococcus, 

 Mantegazzaea, Bacillus and Spirosoma. 



Gonder (1914) in Prowazek's Handbuch der pathogenen Protozoen 

 gives the following classification of the spirochetes. 



Gonder's Classification of the Spirochetes (1914) 



Spirochaeta Ehrb. 1838. 



Type species Sp. plicatilis Ehr. 

 Cristispira Gross 1910. 



Type species, Cristispira halhiani. 

 Spironema Vuillemin 1905. 



Type species Spironema recurrentis. 

 Treponema Schaudinn 1905. 



Type species Treponema pallidum. 



Buchanan (1915) reviewed the terminology for the Coccaceae pro- 

 posed by Winslow and Rogers and suggested certain changes that should 

 be made in names of genera and higher groups the better to recognize 

 priority. 



Buchanan (1917-1918) published a series of articles under the gen- 

 eral heading of ''Studies in the Nomenclature and Classification of 

 the Bacteria, " in which were listed the various names of genera and 

 higher groups which had been recognized in the literature, and a 

 classification of bacteria into orders, families and genera, with designa- 

 tion of tj'pe species for the genera. The dichotomous keys to the 

 groups recognized follow: 



Key to the Orders of the Class Schizomycetes (Buchanan) (1917) 



A. Plant-like in the principal characters, not protozoan like, cells never slender, 

 flexuous spirals; cell divisions never longitudinal. 

 I. Not producing a pseudoplasmodium during the vegetative stage; 

 without a highly developed, cyst-producing, resting stage, 

 a. Containing neither granules of free sulphur, nor bacteriopurpurin, 

 nor requiring the presence of hydrogen sulphid for the best 

 development. 



1. Xot typically producing filaments as a regular growth form, 



though chains of cells may be developed. Conidia not 

 developed, spores when formed are endospores. 

 Order I. Eubacteriales 



2. Typically producing true filaments as a regular growth 



form. Conidia may be developed, but never endospores. 



(a) Alga-like, typically water forms. Filaments never 



showing true branching; false branching maj' be 



