2O4 



C.-E. A. WINSLOW AND ANNE F. ROGERS 



Here again the packets (10 in number) and the other forms (15 

 in number) are exactly parallel. Both show the same range of acid- 

 ities and the same peculiar relation to nitrate reduction. It seems 

 quite clear that in this case the single character of packet formation 

 ought not to be made the basis of a distinct genus. We have recog- 

 nized among the yellow forms the two genera Micrococcus and Sar- 

 cina out of deference to custom, which must always play an important 

 part in terminology. In separating the red forms from these two 

 old genera, however, it seems an unreasonable recognition of a false 

 distinction to form two new ones on the single character of cell- 

 grouping alone. We desire, therefore, to include all the red-pigment 

 forms, characterized by the properties noted above, under one new 

 genus, to be called Rhodococcus. M. cinabareus Fliigge, S. rosacea 

 Lindner, and S. incarnata Gruber will all belong here. Four- 

 teen doubtful cultures are for the present omitted from this generic 

 classification. 



It remains only to summarize the characteristics of the six genera 

 studied in this investigation in tabular form, and then to present 

 a systematic statement of the main divisions of the Coccaceae. It 

 must be remembered that Diplococcus and Ascococcus have not 

 been included in the present research and are denned solely from the 

 the literature. 



TABLE 43. 

 CHARACTERS OF CERTAIN GENERA OF THE COCCACE^E. 



*Body alone; air, source of many others. In Albococcus none from water or earth. 



2. SYSTEMATIC SUMMARY. 



Family Coccaceae: Vegetative cells spherical. 

 Subfamily i Paracoccaceae (Winslow and Rogers): Parasites 

 (thriving only or best, on or in, the plant and animal body). Thrive 



