THE CLASSIFICATION OF BACTERIA 313 



13. Ps. punctata (Zimmerman) 



B.functatus Zimmerman : Bak. Nutz u. Trinkwasser, Chemnitz, 1890, 38. 

 Bad. punciatum Lehmann-Neumann : Bak. Diag., 1896, 238. 



Morphology. Bacilli 0.5 : 0.8 /x — filaments. A polar flagellum. Not stained 

 by Gram's method. 



Gelatin colonies. Round, punctiform, entire, becoming erose, then filamen- 

 tous — ciliate, then sunken and liquefied like cholera colonies. 



Milk. Coagulated, becoming fluid. 



Glucose bouillon. Gas. H2S produced. Tndol slight. 



Habitat. Water. 



B. annulatm Zimmerman : I.e., 1894. Probably identical with the preceding. 

 14. Ps. fimbriata (Wright) 



B.Jimbriatus 'Wri^t: I.e., 463. 



Morphology. Bacilli medium-sized, ends blunt, short — long forms — chains. 



Flagella several. 

 Gelatin colonies. Deep : round, granular, sharp, grayish in centre. Surface : 



rounded, yellowish white, sunken, 1-2 mm., sometimes surrounded by a 



clouded liquid zone ; microscopically, dark brownish, granular in centre ; 



edge a delicate fringe. 

 Gelatin stab. Liquefaction napiform, a slight pellicle, iridescent, becoming 



slightly greenish. 

 Agar slant. Growth smooth, dark gray, glistening ; agar becomes brownish. 

 Bouillon. Turbid ; a slight pellicle, becoming a dark greenish tint. 

 Potato. Growth grayish — light brownish, slightly rough, spreading. 

 Litmus milk. Coagulated, decolorized, amphoteric. Indol produced. 



Nitrates not reduced. Grow at 36°. 

 Habitat. Water. 



15. Ps. geniculata (Wright) 



B, geniculatus Wright : I.e., 459. 



Morphology. Bacilli medium-sized, in pairs and filaments. 



Gelatin colonies. Deep :■ yellowish, round, sharp, slightly granular ; studded 

 with small plaques and buds. Surface: round, translucent, whitish, 

 somewhat depressed ; microscopically, brownish, granular centre, thin 

 margin, entire — undulate with radiating fibrils, becoming liquefied, 

 crateriform ; centres gray white — yellowish, with an outer zone of 

 radiating fibrils. 



