BACTERIA 113 



GENERA OF THE BACTERIACE.E 



Cells without organs of locomotion Bacterium 



Cells with organs of locoomtion 



1. Flagella distributed over the whole body Bacillus 



2. Flagella polar Pseudomonas 



GENERA OF THE SPIRILLACE.E 



Cells rigid not snakelike or flexuous 



1. Cells without organs of locomotion Spirosoma 



2. Cells with organs of locomotion 



(a) With one, very rarely two or three polar 



flagella Microspira 



(6) Cells with polar flagella in tufts of five 



to twenty Spirillum 



Cells flexuous Spirochasta 



GENERA OF THE CHLAMYDOBACTERIACE.E 



Cell contents without granules of sulphur 

 j . Cell threads unbranched 



(a) Cell division always only in one plane. . Chlamydothrix 

 (6) Cell division in three planes previous to 



conidia formation 



i. Cells surrounded by a very 

 delicate, scarcely visible, sheath 



"(marine) Phragmidiothrix 



ii. Sheath clearly visible (in fresh 



water) Crenothrix 



2. Cell threads branched (pseudobranches) Sphaerothrix 



FAMILIES OF THE THIOBACTERTA 



Filamentous bacteria which do not contain bac- 



teriopurpurin. Cells contain sulphur granules . . BEGGIATOACE^E 



Cells contain bacteriopurpurin, sulphur granules 



may also be included RHODOBACTERIACE^ 



GENERA OF THE BEGGIATOACE./E 



Cells non-motile, threads attached to some object. .Thiothrix 

 Moves by means of an undulating membrane Beggiatoa 



GENERA OF THE RHODOBACTERIACE.E 



This family includes twelve genera as follows: Thiocystis, Thiocapsa, Thiosarcina, 

 Lamprocystis, Thiopedia, Amcebobacter, Thiothece, Thiodictyon, Thiopoly- 

 coccus, Chromatium, Rhodochromatium and Thiospirillum. 



