Differentiation of Certain Genera of Gram Negative Bacteria 515 



ll l,ljlljlt5'lS'n'!0l5)l»'«')'5'vl)9lt 't ' ik l»,l J) 



Fig. 7. Diagram showing the similarity values (S) of the yellow to brown 

 pigmented rods from marine sources. 



marine sources and put them through a variety of tests ( 25 ) . Of 

 the total of 54 organisms finally available only six were motile, 

 three being polar and three peritrichous. His results, analysed 

 according to the formula of Sneath, showed that amongst the non- 

 motile strains there were at least two well-defined major groups, 

 A and G. (Fig. ). Their main differentiating features are shown 

 in Table 5. 



If swarming on agar and moi*phology count for anything, 

 then it might be concluded that Group I are rather similar to the 

 typical Cytophago sp. of Bergey. Yet Hayes, despite persistent 



