KEY TO THE GENERA AND SPECIES OF 

 THE COCCACE.E 



CELLS SPHERICAL: FAMILY, COCCACE^. 



A. Parasites. Growth not Abundant, (or, one Species, 

 zooglea-forming saprophytes. growth abundant in 

 Saccharose Media). Generally Gram +. Acid 

 Formers. 



Subfamily, Paracoccace^e. 



I. Cells in capsulated pairs. Parasites. Growth very meagre. 

 Inulin fermented. No pigment. 



Genus, Diplococcus. 



A. Cells lanceolate, in pairs, no chains. Gram +. 



i. In lungs and sputum. D. pneumonia. 



B. Cells flattened, in pairs, no chains. Gram — . 



2. In pus cells in gonorrheal infection. Growth 



meagre. D. gonorrhoea. 



3. In cells in cerebro-spinal exudate. Growth 



meagre. D. Weichselbaumii. 



4. In normal throat. Growth on media fair. 



D. catarrhalis. 



C. Cells in chains of pairs, surrounded by zooglea. 



5. D. involutes. 



II. Cells in chains occurring in masses of zooglea in sugar 

 refineries. Aberrant saprophytic forms. Growth 

 abundant in saccharose media. No pigment. 

 Genus, Ascococcus. 

 1. A. mesenteroides. 



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