CLASSIFICATION 33 



Sub-family 1. Allococcaceae. 

 Planes of fission without definite sequence ; no pronounced colonies or growth- 

 forms, cells isolated or in short chains or irregular clusters. 



Genus MICROCOCCUS, Cohn. Non-motile. Includes most cocci, the pathological 

 ' staphylococci,' &c. 



Genus Planococcus, Migula. Motile. 



Sub-family 2. Homococcaceae. 

 Planes of fission in definite sequence. 



Genus Sarcina, Goodsir. Three planes of division at right angles to each other. 

 Cubical colonies, non-motile. 



Genus Planosarcina, Migula. Similar to Sarcina, but monotrichous, ciliate, and 

 motile. 



Genus Pediococcus, Lindner. Two planes of fission, alternate and at right angles. 

 Micrococcus tetragenus, Thiopedia (a sulphur organism), and probably some species 

 usually termed micrococcus. 



Genus STREPTOCOCCUS, Billroth. Planes of fission parallel, giving rise to chains ; 

 the pathological Streptococci and Leuconostoc. 



Family 2. Bacillaceae. 



Vegetative cell straight, cylindrical, ellipsoidal or egg-shaped ; very short forms 

 difficult to distinguish from cocci. Fission always transverse. 



Sub-family 1. Bacilleae. 

 Spore-forming rods cylindrical, unchanged. 



Genus Bacillus, Cohn. Non-motile. B. anthracis, B. diphtheriae, &c. 



Genus Bactrinium, A. Fischer. Motile, monotrichous, with terminal cilium : 

 includes provisionally all monotrichous rods whose spores are as yet unknown, e.g. 

 Bac , pyocyaneus. 



Genus Bactrillum, A. Fischer. Motile, with lophotrichous ciliation. Includes 

 provisionally Bac. cyanogentts, and many other sporeless forms. 



Genus Bactridium, A. Fischer. Motile, peritrichous, in some spores as yet un- 

 known. Very numerous representatives, e. g. B. subtilis, B. megatherium, B. vulgaris 

 (old genus Proteus), B. typhi, and B. colt. 



Sub-family 2. Clostridieae. 



Rods spindle-shaped during sporulation. 



Genus Clostridium, Prazmowski. Motile, peritrichous; 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. 



FISCHER D 



