512 Marine Microbiology 



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Fig. 6. Gut group Vibrio (39) showing rounded bodies on sea water agar. 



Phase contrast X1200. 



this characteristic than hitherto. Coccoid bodies have been de- 

 scribed in certain luminous bacteria (32), which, on our criteria 

 are believed to be Vibrio sp. (53), and they are a regular feature 

 of many of the vibrios we have recently been examining at 

 Tony Research Station (Figs. 5 and 6), e.g., Vibrio anguillariim 

 and V. sp. (from fish intestines). 



The Achrornobacter Group:- While the differentiation of 

 the Fseudomonas, Aeromonas, Vibrio groups is fairly clear-cut 

 and straight forward in our suggested scheme, that of the Achro- 

 rnobacter group does pose certain difficulties. Part of these re- 

 side in the fact that the original t}pe species, Achrornobacter 

 liquefaciens, defined in Bergey as being peritrichous, is absent 

 from any known Collection and partly because the data concern- 

 ing this organism in Bergey are insufficient to identify it with 



