THE CLASSIFICATION OF BACTERIA 85 



28. M. tardissimus (Trev.) Bumm 



Milk-white Micrococcus Bumm : Mikroorganismus der gon. Schleimhauterk., 1885. 

 Diplococcus albicans-tardissimus Flugge : Die Mikroorganismen, 1886. 

 Neisseria tardissima Trevisan : Gen. e spec. Batteriaceae, 1889. 



Morphology. Gonococcoid forms. 



Gelatin colonies. Small, punctiform ; microscopically round, opaque, brownish 



gray ; colonies in 2 weeks become 2 mm. in diameter. 

 Gelatin stab. A grayish white beaded growth along the line of inoculation ; 



on the surface, growth thin, white, stearine-like, with dentate margins. 

 Habitat. Found in vaginal secretions, especially those of puerperal women. 



29. M. magnus (Rosenthal) 



Diplococcus magnus Rosenthal : Centralblatt f. Bakteriologie, XXV, 1899, 1. 



Morphology. A diplococcus with a distinct capsule, also gonococcoid-like 



forms. Non-motile. Decolorized by Gram's method. 

 Gelatin colonies. After some days, yellowish white, convex. 

 Glycerin agar colonies. In 24 hours, convex, grayish white, with a fatty 



lustre, radially striped and concentrically ringed, with a sharp indented 



border; opalescent. 

 Gelatin stab. Very small colonies along line of stab, and a small segmented 



colony on the surface. 

 Agar slant. In 18 hours at yj C. a growth composed of punctiform colonies. 

 Glycerin agar slant. A scanty growth composed of minute colonies, scarcely 



discernible to the naked eye. 

 Agar stab. In depth a slight growth ; on the surface growth grayish white, 



segmented and radially striped. 

 Gelatin slant. As on glycerin agar. 

 Bouillon. In 24 hours, at 16-18 , turbid ; little sediment. 

 Glucose bouillon. No gas. 



Potato. An abundant growth, as orange-yellow points. 

 Habitat. Isolated from the air. 



30. M. candidus Cohn 



Beitrage Biologie, I, 1875, 160. 



Morphology . Cocci round, 0.5-0.7 p. 



Gelatin colonies. Snow-white ; margins irregular, granular. 



