34 GENERAL SYSTEMATIC BACTERIOLOGY 



A. Cells or colonies free or embedded in slime, without definite gelatinous 



membranes. 



1. Cells single or arranged irregularly Micrococcus Cohn 



2. Cells united in chains Streptococcus Billroth. 



3. Cells united in a stratum. 



a. In tabular form Lampropedia n. g. 



b. In hollow balls Lamprocystis n. g. 



B. Single cells or cell colonies with a definite firm gelatinous covering 



(cyst). 



1. Cells single or irregularly grouped: 



a. Each cell or small cell family included in a simple gelatinous 



cyst Hyalococcus n. g. 



b. Cells or few celled families included in a many layered slime 



capsule Leucocystis Schroeter 



c. Cell families of many cells enclosed in an almost solid gelat- 



inous mass Ascococcus Billroth 



2. Cell families regularly formed: 



a. Cell families in packet-shaped bundles, each single cell with a 



capsule Sarcina Goodsir 



b. Cells in chains, each family in a capsule. 



Leuconostoc Van Tieghem 

 II. Order: Eubacteria. Cells rod shaped, shorter or longer. 



Family Bacteriacei 



A. Cells or cell groups without definite gelatinous capsule. 



1. Cells straight or slightly bent, not spiral. 



a. Cells very small, elliptical, motile or non-motile, spores 



unknown Bacterium Ehr. 



b. Cells cylindrical, motile or non-motile : 



(1) Cells relatively very broad. Red, with sulfur. 



Chromatium Perty 



(2) Cells in vegetative condition narrow rods. Endoge- 



nous spores. 



(a) Spore bearing cells cylindric. 



Bacillus Cohn 



(b) Spore bearing cells spindle shaped. 



Clostridium Praz. 



2. Cells and cell chains spiral, usually actively motile. 



a. Spirals stiff (not flexuous). Endogenous spores. 



Spirillum Ehr. 



b. Spirals flexuous: 



(1) Cells known only in the form of a long flexuous spiral. 



Spores unknown Spirochaete Ehr. 



(2) Cells in greater part of life only with short (§) spiral, 



later growing to screw form. Spores spherical. 

 Arthrospores Microspira n. g. 



B. Cells enclosed in definite gelatinous masses. 



1. Cells wound in small numbers in a transparent capsule. 



Myconostoc Cohn 



