Abstract
A bacterial strain B-1 isolated from the seashore was identified as V. alginolyticus. This strain, marine halophilic bacterium, was examined by means of electron microscopy, to observe the fine structure and the flagella. The bacterium had a single polar flagellum when grown in a liquid medium and had peritrichous flagella when grown on a solid medium. In liquid medium, several bleb-like tubular structures originating from the cell wall were often observed. These seem to be immature and intermediate forms of flagella. The flagella number and the body length of the strain increase with incubation time on agar plates.