20 



migula's classification of bacteria 



FAMILIES. 



I. Cells globose in a free state, 

 not elongating in any direc- 

 tion before division into 1,2, 

 or 3 planes i. Coccacese. 



II. Cells cylindrical, longer or 

 shorter, and only dividing in 

 I plane, and elongating to 

 twice the normal length be- 

 fore the division. 



(i) Cells straight, rod-shaped, 

 without sheath, non-motile, 

 or motile by means of fla- 

 gella 2, 



(2) Cells crooked without sheath 3 



(3) Cells enclosed in a sheath 4. 



(4) Cells destitute of a sheath, 



united into threads, motile 

 by means of an undulating 

 membrane 5. 



Bacteriacege. 



Spirillacese. 



Chlamydobacteriaceae. 



Beggiatoaceae. 



I . Coccacece. 



Cells without organs of motion. 



a. Division in i plane i. 



b. Division in 2 planes 2. 



c. Division in 3 planes 3. 



Cells with organs of motion. 



a. Division in 2 planes 4. 



b. Division in 3 planes 5. 



2. BaderiacecB. 



Cells without organs of motion, i. 

 Cells with organs of motion 

 (flagella). 



Streptococcus. 



Micrococcus. 



Sarcina. 



Planococcus. 

 Planosarcina. 



Bacterium. 



