258 RELATIONSHIPS OF THE COCCACE/E 



throat), or penetrating the tissues in disease. Occurs in 

 the body in regular groups of four, surrounded by a cap- 

 sule. Generally stains by Gram. Good surface growth, of 

 grayish white color, and viscid consistency. Gelatin not 

 liquefied. 



Subfamily B. MetacoccacejE Winslow and Rogers. 



Facultative parasites or saprophytes. Thrive best under 

 aerobic conditions. Grow well on artificial media, pro- 

 ducing abundant surface growths. Planes of fission often 

 at right angles; cell aggregates in groups, packets, or 

 zooglea masses. Generally decolorize by Gram. Pig- 

 ment yellow or red. 



Genus VI. Micrococcus (Hallier, Cohn) Winslow and 

 Rogers. 



Facultative parasites or saprophytes. Cells in plates or 

 irregular masses (never in long chains or packets). Gen- 

 erally decolorize by Gram. Growth on agar abundant, 

 with formation of yellow pigment. Dextrose broth slightly 

 acid, lactose broth generally neutral. Gelatin frequently 

 liquefied. Nitrates may or may not be reduced. 



Species 1. M.flavus (Fliigge) Migula. 

 A saprophytic or semi-parasitic coccus, found most 

 commonly in earth, water, and air, frequently also on the 

 surfaces of the animal body. Occurs singly, or in pairs, or 

 irregular groups. Generally decolorizes by Gram. Good 

 to abundant, yellow surface growth. Reaction in dextrose 



