THE CLASSIFICATION OF BACTERIA 43 



(i) Cells straight, rod-shaped, without 

 sheath, non-motile, or motile by ' 

 means of flagella 2. Bacteriaceas. 



(2) Cells crooked, without sheath . . 3. Spirillaceas. 



(3) Cells enclosed in a sheath ... 4. Chlamydobacteriaceae. 



(4) Cells destitute of a sheath, united 



into threads, motile by means of 



an undulating membrane . .5. Beggiatoaceae. 



GENERA 



I. Coccacea 



Cells without organs of motion. 



a. Division in I plane I . Streptococcus. 



b. Division in 2 planes 2. Micrococcus. 



c. Division in 3 planes 3. Sarcina. 



Cells with organs of motion. 



a. Division in 2 planes 4. Planococcus. 



b. Division in 3 planes 5. Planosarcina. 



2. Bacteriacea 



Cells without organs of motion . . .1. Bacterium. 

 Cells with organs of motion (flagella) . 



a. Flagella distributed over the whole 



body 2. Bacillus. 



b. Flagella polar 3. Pseudomonas. 



3. Spirillacea 



Cells rigid, not snakelike or flexuous. 



a. Cells without organs of motion . i . Spirosoma. 



b. Cells with organs of motion 



(flagella). 



1. Cells with I, very rarely 2-3 



polar flagella 2. Microspira. 



2. Cells with polar flagella, in 



tufts of from 5-20 . . . 3. Spirillum. 

 Cells flexuous ...... ... 4. Spirochaeta. 



.4. Chlamydobacteriacece 



Cell contents without granules of sulphur. 

 a. Cell threads unbranched. 



