KEY TO THE COCCACE/E - 265 



IV. Cells in irregular groups. Parasites. Growth fair. Orange 

 pigment. Genus, Aurococcus . 



A. Nitrates not reduced. 



1. Gelatin strongly liquefied. 



Aur. aureus. 



2. Gelatin not liquefied. 



Aur. aurantiacus. 



B. Nitrates reduced. 



3. Aur. mollis. 



V. Cells in irregular groups or in fours. Parasites. Growth 

 good. White pigment. Genus, Albococcus. 



A. Cell groups irregular. 



a. Gelatin liquefied. 



1. Nitrates not reduced. 



Alb. pyogenes. 



2. Nitrates reduced. 



Alb. epidermidis. 



b. Gelatin not liquefied. 



3. Alb. candidus. 



B. Cells in the body in capsulated groups of four. Growth 



viscid. 



4. Alb. tetragenus. 



B. Saprophytes. Growth Abundant. No Zooglea. 

 Gram Generally — . Not Acid Formers. 



Subfamily, MetacoccacejE. 

 VI. Cells in irregular groups. Pigment generally yellow. 



Genus, Micrococcus. 

 A. Pigment typical, yellow. 



a. Gelatin liquefied. 



1. Nitrates not reduced. 



M. Jlavus. 



2. Nitrates reduced. 



M. citreus. 



b. Gelatin not liquefied. 



3. M. luteus. 



