THE CLASSIFICATION OF BACTERIA. 
GENERA. 
1. Coccacee. 
Cells without organs of motion. 
a. Division in one plane. ‘ vib 
b. Division in two planes. : . 2 
ce. Division in three planes . ; . 3. 
Cells with organs of motion. 
a. Division in two planes. ‘ 4 
b. Division in three planes . ; . 5. 
2. Bacteriacee. 
Cells without organs of motion : vole 
Cells with organs of motion (flagella). 
a. Flagella distributed over the whole 
body . : . ; ' «2. 
b. Flagella polar. . ‘ . 3 
8. Spirillacee. 
Cells rigid, not snake-like or flexuous. 
a. Cells without organs of motion ods 
- b. Cells with organs of motion (flagella). 
1. Cells with 1, very rarely 2 to 3 
polar Hagelle.- ; ads 
2. Cells with polar flagella . 3 
Cells flexuous . s - 24 
4. Chlamydobacteriacece. 
Cell contents without granules of sulphur. 
a. Cell threads unbranched. 
I. Cell division always only in one plane 1. 
II. Cell division in three planes previous 
to the formation of conidia. 
1, Cells surrounded by a very delicate, 
scarcely visible sheath (marine) . 2. 
2. Sheath clearly visible (in fresh water) 3. 
b. Cell threads branched ‘ 2 A, 
Cell contents containing sulphur granules 5. 
5. Beggiatoacea. 
Only one species known (Beggiatoa, Trev.), 
separable from Oscillana. 
259 
. Streptococcus. 
Micrococcus. 
Sarcina. 
Planococcus. 
Planosarcina. 
Bacterium. 
Bacillus. 
Pseudomonas. 
Spirosoma. 
Microspira. 
Spirillum. 
Spirocheta. 
Streptothrix. 
Phragmidiothrix. 
Crenothrix. 
Cladothrix. 
Thiothrix. 
which is scarcely 
