24 MANUAL OF DETERMINATIVE BACTERIOLOGY 



Sub-family lb. Rhodobacteroideae 

 Tribe A. Rhodobacteriaceae 

 Genus a. Rhodobacterium 



b. Rhodobacillus 



c. Rhodovibrio 



d. Rhodospirillum 

 6. Rhodosphaera 



Tribe B. Rhodocysteae 

 Genus a. Rhodocystis 

 b. Rhodonostoc 

 Connects with Leuconosloc 

 Family 2. Beggiatoaceae 

 Genus a. Thiothrix 



b. Beggiatoa 



c. Thioploca 

 Family 3. Achromatiaceae 



Genus a. Achrcmatium 

 h. Thiophysa 



c. Thiospira 



d. Hillhousia 

 Order IV. Myxobacieriales 



Family 1. Polyangiaceae 



Genus a. Chondromyces 

 b. Polyangium 

 Family 2. Myxococcaceae 



Genus a. Myxococcus 



Later Pribram (Klassification der Schizomyceten (Bakterien), Leipzig 

 and Wien, 1933, 143 pp.) developed this classification into a suggestive out- 

 line based on his experience in caring for the cultures of the Krai Collection. 

 His most interesting contribution is the separation of the class of Schizo- 

 mycetes into three subclasses which are based on differences in fundamental 

 biological and nutritional relationships. The fourth sub-class of his earlier 

 outline (the Protozoohacteria with its single order Spirochaetales) is omitted 

 from this outline. The first class, Algohacteria, includes the bacteria that 

 are primarily free-living in water, usually motile with polar flagellation and 

 live on easily soluble foodstuffs. They are frequently surrounded by in- 

 soluble secretions such as capsules, sheaths, etc., and form insoluble prod- 

 ucts in their protoplasm, such as calcium, sulfur and iron compounds, and 

 pigments. The class Euhacteria includes those bacteria whose normal 

 habitat is the animal body or complex waste products of plant or animal 

 origin. Because of adaptation to environment, these organisms are motile 

 or non-motile and can utilize compounds of complex molecular structure. 

 The third sub-class, Mycobacteria, is adapted to life in soil, and shows a dis- 

 tinct tendency to differentiation in morphology and spore formation. 



Internationally accepted rules of nomenclature are generally followed, 

 and the generic terms proposed in his earlier outline that were not formed 



