FORM AND STRUCTURE OF BACTERIA 



/v 



FIG. 22. Pseudomonas pyocyanea. Showing mono- 

 trichous flagellation. After Schmidt and Weis. 



(1) Monotrichous one flagellum at one end (Ex. Pseud- 

 omonas pyocyanea) 



(Fig. 22). 



(2) Lophotrichous 

 several flagella at 

 one end in a bunch 

 (Ex. Spirillus rugula) 

 (Fig. 23). 



(3) Amphitrichous 

 flagella at both 



ends, one at each (Ex. 

 Bacillus' butyricus) 

 (Fig. 24). 



(4) Peritrichous flagella on all sides of the cell (Ex. 

 Bacillus typhosus) (Fig. 25). 



The presence of amphi- 

 trichous bacteria have 

 been questioned by some. 

 These investigators hold 

 that an amphitrichous 

 bacterium is formed from 

 a monotrichous bacter- 

 ium which is acquiring a 

 new flagellum prepara- 

 tory to fission. 



In 1894, Migula used 

 the number of flagella on 



FIG. 23. Pseudomonas syncyanea. Showing 

 lophotrichous flagellation. After Schmidt 

 and Weis. 



