38 MANUAL OF DETERMINATIVE BACTERIOLGY 



During 1945, Soriano (Ciencia e Investigacion, 1, 1945, 92-94 and 146- 

 147; Rev. Argentina de Agronomia, 12, 1945, 120) proposed an arrange- 

 ment of the Class Schizomycetes in which he recognizes a new Order, Flexi- 

 hacteriales, to inckide the [families Cyiophagaceae and Beggiatoaceae and 

 an entirely new Family Flexibacteriaceae containing a single genus Flexi- 

 hader. The latter includes five newly recognized species of flexuous bacteria 

 as follows: Flexihacter flexilis, type species, F. elegmis, F. giganteus, F . al- 

 huminosus and F . aureus. 



The outline given below shows how this new order and new family are 

 fitted by Soriano into the classification used in the fifth edition of the 

 Manual. 



Class Schizomycetes 

 Subclass Eubacteria. Rigid cells. Subclass Flexibacteria. Flexuous cells. 

 Order I. Eubacteriales Order VI. Flexihacter iales 



Order II. Caulobacferialei< Family I. Cytophagaceae 



Order III. Rhodobacter iales Family II. Beggiatoaceae 



Order IV. Actinomycetales Family III. Flexibacteriaceae 



Order V. Chlamydobacteriales Order VII. M yxobacteriales 



Order VIII. Spirochaetales 



Prevot (Ann. Inst. Past. 72, 1946, 1) has developed his classification of 

 Class Actinomycetales, subdividing it into orders and including several 

 genera not recognized in his 1940 outline. This classification is as follows: 



Class Actinomycetales 



Order I. Actinubacteriales. New order. Not acid-fast 

 Family I. Spherophoraceae. Family II. Actinomycetaceae. 



Genus I. Spherophorus Genus I. Actinomyces 



Genus II. Harerhillia Genus II. Proactinomyces 



Genus III. Spherocillus Genus III. Corynchacterium 



Genus IV. Fusiformis Genus IV. Actinobacterium 



Genus V. Fusocillus Genus V. Bifidibacterium 



Genus VI. Leptotrichia Genus VI. Erysipelothrix 



Order II. Mycobacter iales. New order. Acid-fast 

 Genus I. Mycobacterium 



This classification differs from that used m this edition of the Manual 

 in that it places several genera of Gram-negative organisms in Actinomy- 

 cetales. These are Spherophorus, Havcrhillia, Spherocillus, Fusiformis and 

 Fusocillus, all of which are included here under Parvohacteriaceae. Lep- 

 totrichia which Prevot regards as Gram-negative is generally accepted as 

 being a Gram-positive group. It is discussed in this edition of the Manual 

 in connection with the genus Lactobacillus. 



