CLASSIFICATION OF BACTERIA '47 



FAMILY L Coccacece cells in free state spherical; division in one, 

 two or three planes; endospore formation rare. 



Genus I. Streptococcus cells divide in one plane only for which 

 reason; if they remain connected after fission bead-like chains may 

 be formed ; no organs of locomotion. 



Genus II. Micrococcus (Staphylococcits^ celh divide in two 

 planes, whereby, after fission, tetrad and grape-like clusters may be 

 formed; no organs of locomotion. 



Genus III. Sarcina cells divide in three planes, whereby, after 

 fission, bale-like packets are formed; no organs of locomotion. 



Genus IV. Planococcus cells divide in two planes, as in Micro- 

 coccus; possess flagella. 



Genus V.Planosarcina cells divide in three planes, as in Sar- 

 cina; posses flagella. 



FAMILY II. Bacteriacece cells long or short; cylindrical, straight 

 never spiral; division in one plane only, after preliminary elongation 

 of the rods. 



Genus I. Bacterium cells without flagella; often with endospores. 



Genus II. Bacillus cells with peritrichal flagella; often with 

 endospores. 



Genus III. Pseudomonas cells with polar flagella; endospores 

 occur in a few species but are rare. 



FAMILY III. Spirillacea cells spirally curved or representing 

 a part of a spiral curve; division in one plane only, after elongation 

 of cell. 



Genus I. Spirosoma cells without organs of locomotion; rigid. 



Genus II. Microspira cells rigid, with one or more rarely, two 

 or three polar undulated flagella. 



Genus III. Spirillum cells rigid, with polar tufts of five to 

 twenty flagella usually curved in semicircular or flat undulating 

 curves. 



Genus IV. Spiroclioeta cells sinously flexible; organs of loco- 

 motion unknown, perhaps a marginal undulating membrane. 



FAMILY IV. ChlamydobacteriaceGeYmrns of varying stages of 

 evolution, all possessing a rigid sheath, which surrounds the cells; 

 cells united in branched or unbranched threads. 



Genus I . Streptothrix cells united in simple, unbranched threads ; 

 division in one plane only; reproduction by non-motile conidia. 



Genus II. Claduthri.r cells united or pseudodichotomously 

 branching threads; division in one plane only; vegetative multipli- 

 cation by separation of entire branches; reproduction by swarming 

 forms with polar flagella. 



Genus III. Crenoilirix cells united in unbranched threads; 

 division at first in one plane only. Later the cells divide in all three 

 planes; the daughter cells become rounded and develop into repro- 

 ductive cells. 



