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The baaterium Flaobcterium aquatile (Frankland and Frankland) Bergey et al. was isolated and described as BaciUus aquatiis (Frankland and Frankland, 1889). The species was slected by Bergey et al. (1923) as the type for the genus Flavoberium. With the exception of studies by Gary (1950) the genus appears to have rceived very little systematic investigation. If the type concept of taxonomy is-followed, then the type species should play an. important role in any arrangement of a genus. The studies which. were made by Gary, and those which are reported here, make it apparent -that the cultures which are in circulation as F. aquatile cannot be accepted as such. These cultures, together with ofthers considered as possble representatives of the type species, form a heterogeneous. group. Further, the original description of B. aquatilis, which has been emended very little, is of such nature that heterogeneity is more probable than ready recognition. Original description of Bacillus aqualiis. The Franklands (1889) recognized B. aquatilis as a slender, rod-shaped bacterium about 2.5 p long. Filamentous structures 17 p in length were reported, and endospores were not seen. Differentiation of the pcies from simila forms found in water was accomplished on the basis of the type of motion shown, the appearance of colonies upon gelatin plates, and the slownes with which the ornisms grew. Motility in a hanging drop preparation was not observed; instead the authors described an oscillatory movement for both individual cells and filaments, with many of the latter showing no observable motion. Colonies on gelatin plates developed slowly and were yellow-brown. Some surface colonies gave a characeristic appearance due to the extension of twisted filaments from a reddish granular

FLAVOBACTERIUM AQUATILE (FRANKLAND AND FRANKLAND) BERGEY ET AL., TYPE SPECIES OF THE GENUS FLAVOBACTERIUM