SUMMARY OF THE GENERA AND SPECIES OF THE 

 COCCACE,E.* 



Family Coccace^e (Zopf) Migula. 



Cells, in their free condition, spherical; during division 

 somewhat elliptical. In the latter condition, division has 

 already set in, altho it may not be apparent. Division in 

 one, two, or three planes, without previous elongation of 

 the cells. If the cells remain in contact after division 

 they are frequently flattened in the plane of division. 

 Motility is present only in a few forms. Formation of 

 endospores appears to be absent or very rare. 



Subfamily A. Paracoccace^ Winslow and Rogers. 



Parasites (thriving only, — or best, — on, or in, the plant 

 and animal body). Thrive well under anaerobic conditions. 

 Many forms fail to grow on artificial media; none produce 



* These characterizations of species and genera must be interpreted 

 in the light of the views in regard to bacterial relationships set forth in 

 Chapter I. They correspond to the central types, about which other 

 varieties of the cocci are grouped; but intermediate varieties will fre- 

 quently be met with. 



The meaning of the terms used in the descriptions is fully explained 

 in Chapters III and IV. The standard color chart for determin- 

 ing chromogenesis is reproduced as the frontispiece of this volume. 

 The quantitative relations of each genus in regard to acid production, 

 gelatin liquefaction, etc., are indicated in the table on page 97 and in 

 Figures I-III. 



249 



