COCCACEM 



925 



The two tribes may be divided into genera as set forth in the 

 following table: — 



Diagnostic Table of the Family Coccace^ Zopf, 1885. 

 Growth and Carbohydrates. 



Poor and fermented 

 (Streptococceae) . 



Gram's stain. 



Negative. 

 I. Neisseria. 



Positive. 

 I 



Pigment. 

 I 



Good and not fermented 

 (Micrococceae). 



Pigment . 



Red. Yellow. Black. 

 I 



7. Rhodococcus. Cells. 10. Nigrococcus. 



Absent. 

 I 



Cells. 



Present. 



Irregular groups. 

 8. Micrococcus. 



Packets. 

 9. Sarcina. 



In zoogloea Not in zoogloea 

 masses. masses. 



2. Ascococctis. Morphology, 

 bile and salt. 



Orange. 

 5. Auvococcus. 



White. 

 6. Albococcus. 



Pairs or chains encap- 

 sulated, soluble in 

 bile and salt solu- 

 tions. 



3. Diplococcus. 



We are, however, only 

 Streptococceae, which are 

 Aurococcus and one genus 

 As Micrococcus melitensis 

 propose to place it under a 



Chains, not encapsu- 

 lated, not soluble 

 in bile or salt solu- 

 tions. 



4. Streptococcus. 



concerned with certain genera of the 

 Neisseria, Diplococcus/ Streptococcus, 

 of the Micrococceae — viz., Nigrococcus. 

 is often elongated (coccobacillus) , we 

 separate heading, ' IncericB Sedis.' 



TRIBE 1. 



STREPTOCOCCEAE Trevisan, li 

 Rogers, 1905. 



emendavit Winslow and 



Genus Neisseria Trevisan, 1885. 



Synonyms. — Micrococcus Hallier, 1866, pro parte ; Diplococcus 

 Weichselbaum, 1887, pro parte. 



Definition. — Streptococceae growing best, and often only, aerobi- 

 cally, with or without pigment formation, usually present in pairs 

 without a true capsule, and in exudates usually intracellular, and 

 readily decolourized by Gram's method of staining. 



Primary cultures grow poorly on usual laboratory media, but 

 best on media containing glucose or blood serum. No lysis with bile. 

 Ferment carbohydrates usually with but slight acid production. 



Type Species. — Neisseria gonorrhoscB (Bumm, 1885). 



