72 GENERAL SYSTEMATIC BACTERIOLOGY 



Order II. Peritrichinae 

 Key to Genera of Family I. Acidobacteriaceae 



I. Active denitrifying forms Denilrobacterium 



II. Not as in I: 



A. Rod shaped: 



1. Organisms of the B. colt group Bacterium 



2. Gram + lactic acid forms Caseobacterium 



3. Producing propionic acid Propionibacteri%im 



B. Spherical: 



1. In chains Streptococcus 



2. Irregularly grouped Micrococcus 



3. In packets Sarcina 



Key to the Genera of Family II. Alkalibacteriaceae 



I. Organisms of the Proteus type Liquidobacterium 



II. Organisms of the B. subtilis type Bacillus 



III. Producing ammonia from urea Urobacillus 



Key to the Genera of Family III. Butyribacteriaceae 



I. Acting primarily upon sugars, forming butyric acid. 



Butyribacillus 



II. Acting primarily upon pectin Pectobacillus 



III. Acting primarily upon cellulose Cellulobacillus 



Key to the Genera of Family IV. Putribacteriaceae 



I. Not producing an ectotoxin Putribacillus 



II. Producing an ectotoxin Botulobacillus 



It will be noted that Orla- Jensen has created a considerable number 

 of generic names, many times substituting new names for older and 

 apparently perfectly valid terms. 



Among the new genera described in 1909 by other authors were 

 Hillhousia a giant sulphur organism named hj West and Griffiths, 

 Siderocapsa, a capsulated epiphytic coccus growing in water contain- 

 ing iron and with iron oxid deposition in the capsule, named by Molisch, 

 and Erysipelothrix an organism of the general type of the bacterium of 

 swine erysipelas named by Rosenbach. 



Molisch (1910) in his book "Die Eisenbakterien " recognizes the 

 genera and species separated by the following key. 



Molisch (1910) Classification of the Iron Bacteria 



A. Filamentous bacteria. 



I. Filaments always unbranched. 



a. With brown attaching disks Chlamydothrix sideropoiis 



h. Not as "a." 



