wavelength 3.5 microns. Mixed flagellation with lateral flagella of 

 shorter wavelength than the polar flagellum was observed in a 

 culture isolated from a live oyster ( Fig. 9 ) . 



The plant pathogens are remarkably uniform in their flagella- 

 tion which is polar multitrichous, often lophotrichous (Fig. 10). 

 The only exception studied is Pseiidomonas pohjcolor which, ac- 

 cording to personal communication from Dr. M. P. Starr, and 

 Bergey's Manual, is a questionable plant pathogen. The only 

 flagellar variant observed was in Pseudomoiias washingtoiiiae with 

 flagella of two distinctly different wavelengths. 



All of the halophiles studied were monotrichous. Some showed 

 the typical flagellation of ordinary pseudomonads, others had 

 flagella of the undulant type. This type of flagella is rather rare 

 and has been observed mainly in what may be considered as 

 typical water bacteria, particularly marine. In two of the cultures 

 studied (B-13 and B-28) some individuals had normal flagella, 

 others had undulant flagella. One individual was found with a 

 normal flagellum at one pole and an undulant flagellum at the 

 other pole (Fig. 11a). 



30 



