40 RELATIONSHIPS OF THE COCCACE^E 



further development in the same direction, its growth 

 form being larger and produced by three planes of divi- 

 sion, its saprophytic habit being more marked (no truly 

 pathogenic forms being known to exist), with the power of 

 acid production generally wanting. These genera seemed 

 to mark important phylogenetic stages in a series of 

 types of Coccaceae ranging from such strict parasites as 

 D. Weichselbaumii, through intermediate streptococci 

 and micrococci to the vigorously growing saprophytic 

 sarcinae. 



