n6 BACTERIOLOGY 



short, usually one for each cell. In artificial cultures, as a rule, an active 

 motility of the cells is not observed, and most of the individuals are non- 

 motile. 



A. Chromogenic, pigment orange-reddish. 



1. Planosarcina mobilis (Maurea) Migula. 



2. Planosarcina agilis (Ali-Cohen). 



B. Non-chromogenic. Growth on agar and gelatin grayish. 



3. Planosarcina Samesii. 



1. Planosarcina mobilis (Maurea) Migula 



Sarcina mobilis Maurea: Centralblatt f. Bakteriologie, XI, 1892. 

 Planosarcina mobilis Migula : I.e. 



Morphology. Cocci 1.4 //,, in typical packets, each cell with 1-2 flagella gener- 

 ally about three times the length of the cell. 



Gelatin. Liquefied slowly, with formation of a brick-red pigment. f 

 Agar slant. Growth thin, orange- or brick-red. 

 Milk. Not coagulated. 

 Potato. No growth. 



2. Planosarcina agilis (Ali-Cohen) Migula 



See Planococcus agilis Ali-Cohen, No. 2. 



3. Planosarcina Samesii 



Eine be-wegliche Sarcina Sames : Centralblatt f. Bakteriologie, IV, 1898, 664. 



Morphology. Cocci in packets of 8 elements, 3.0 /A square. Stain by Gram's 



method. Actively motile ; flagella long, thick, spiral, 20-50 from a single 



packet; grow best in an alkaline medium. 



Alkaline gelatin slant and alkaline agar slant. A glistening grayish layer. 

 Alkaline gelatin stab. In depth, growth abundant, beaded; in 10-14 days 



acicular outgrowths. On the surface, growth grayish, spreading. 

 Alkaline gelatin colonies. Deep, irregular, dark. Surface: in 4-5 days round, 



gray, 5-10 mm. On Zettnow^s Spirillum agar (Centralblatt f. Bakteriol. 



XIX, 394), deep colonies, oval-irregular, dark black. Surface round, 



granular, grayish. 

 Potato. No growth except when made alkaline with Na 2 Co 3 , then yellowish, 



becoming brown. 



