THE CLASSIFICATION OF BACTERIA 313 



13. Ps. punctata (Zimmerman) 



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

 Bact.punctatum 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. H 2 S produced. Indol slight. 



Habitat. Water. 



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

 14. Ps. fimbriata (Wright) 



B.fimbriatus Wright: 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. 



