FAMILY BACTERIACEAE 



627 



highly turbid throughout the liquefied 

 zone. 



Agar liquefaction: Extensive softening 

 of agar, no free liquid. 



Sea water glucose broth: Abundant 

 uniform turbidity, with surface pellicle; 

 some strains give heavier turbidity and 

 others heavier pellicle. 



Litmus milk containing 3.5 per cent 

 salt: No apparent growth. 



Potato moistened with sea water: 

 Moist, spreading growth, ivory-colored; 

 heavy sediment in free liquid at the 

 bottom. 



Starchplate: Abundant, cream-colored, 

 slimy growth; extensive diastase produc- 

 tion. 



Aerobic, microaerophilic. 



Optimum temperature 20°C. 



Source: From sea water, sea bottom 

 sediments and from the surface of algal 

 growth in the sea. 



Habitat: Very common in the sea. 



36. Bacterium fucicola Waksmau, 

 Carey and Allen. (Jour. Bact., 28, 1934, 

 213.) From Latin fucus, seaweed and 

 cola, dweller. 



Short rods: 0.6 to 1.0 bv 1.0 to L5 



microns, with ends rounded to almost 

 coccoid; slightly curved. Actively mo- 

 tile, with twirling motion. Gram-nega- 

 tive. 



Alginic acid plate: Colonies finely 

 granular, entire; at first whitish, turning 

 brown in three to five days, and later 

 almost black, producing a deep brown 

 soluble pigment. 



Alginic acid liquid medium: Limited 

 growth on surface in the form of a pelli- 

 cle. Frequently produces no growth 

 at all. 



Sea water gelatin: Active liquefaction; 

 no growth in stab; thin, fluorescent 

 growth throughout liquefied zone. 



Agar liquefaction: Positive, although 

 limited; only softening of agar. 



Sea water glucose broth: Faint tur- 

 bidity; no pellicle, no sediment. 



Litmus milk containing salt: No ap- 

 parent growth. 



Potato moistened with sea water: Xo 

 growth. 



Starch plate: Xo growth. 



Aerobic. 



Optimum temperature 20°C. 



Source: From sea water near the sur- 

 face of the sand bottom. 



Habitat: Rare in sea water. 



Appendix I: Additional agar-digesting bacteria placed in genera other than Bac- 

 terium. 



\. Achromobacter. 



A. Motile with peritrichous flagella. 

 1. Xitrites produced from nitrates. 



1. Achromobacter pastinalar. 

 II. Agarbacterium. 



A. Xon-motile. 



1. Xitrites produced from nitrates. 



2. Agarbacterium bufo. 



B. Motile, but position of flagella not recorded. 



1. Xitrites produced from nitrates. 



3. Agarbacterium reducans. 



4. Agarbacterium viscosuyn. 



2. Xitrites not produced from nitrates. 



5. Agarbacterium mesentericus. 



6. Agarbacterium aurantiacum. 



7. Agarbacterium cyanoidcs. 



3. Seven additional species that are numbered but not named. 



