34 MICROBIOLOGY 



Genus BACILLUS Colin. Non-motile. B. anthracis, B. 

 diphtheriae, etc. 



Genus BACTRINIUM A. Fischer. Motile, monotrichous, 

 with terminal cilium. Includes provisionally all monotrich- 

 ous rods whose spores are as yet unknown, e. g., Bac. pyo- 

 cyaneous. 



Genus BACTRILLUM A. Fischer. Motile, with lopho- 

 trichous ciliation. Includes provisionally Bac. cyanogenus, 

 and many other sporeless forms. 



Genus BACTEIDIUM A. Fischer. Motile, peritrichous, 

 in some spores as yet unknown. Very numerous represen- 

 tatives, e. g., B. subtilis, B. megatherium, B. vulgaris (old 

 genus Proteus), B. typhi, and B. coli. 



SUB-FAMILY 2. CLOSTRIDIEAE. 



Rods spindle-shaped during sporulation. 



Genus CLOSTRIDIUM Prazmowski. Motile, peritrich- 

 ous; includes some of the butyric bacteria. Genera with 

 monotrichous and lophotrichous ciliation are unknown as 

 yet. 



SUB-FAMILY 3. PLECTRIDIEAE. 



Rods drum-stick-shaped during sporulation. 



Genus PLECTRIDIUM A. Fischer. Motile, peritrichous. 

 Some butyric bacteria, the parasite of tetanus and a 

 methane ferment. 



FAMILY 3. SPIRILLACEAE. 



Vegetative cell cylindrical but spirally twisted. Fission 

 always transverse. 



Genus VIBRIO Miiller and Loffler. Very slightly 

 curved rods 'comma' shaped; motile, monotrichous. Vibrio 

 cholerae asiaticae and numerous other vibrios of fresh and 

 salt water. 



Genus SPIRILLUM Ehrenberg. Cylindrical cells twisted in 

 an open spiral; motile, lophotrichous. Spirillum undula, Sp. 

 rubrum. 



