68 MORPHOLOGY OF THE BACTERIA 



Cells cylindrical, cu- 

 neiform, with phy- 

 cochrome, with- 

 out regular ar- 

 rangement . . GOMPHOSPH^ERIA, Kg. 

 2. Number of cells very 

 great and indetermi- 

 nate : 



Cells colorless, very 

 small .... Ascococcus, Billr. 



Cells colored by 

 phycochrome 

 and larger . . 



POLYCYSTIS, Kg. 

 COCCOCHLORIS, Spr. 



POLYCOCCUS, Kg. 



TRIBE 2. NEMATOGENES. 



Cells disposed in filaments. 



A. Filaments not branched : 

 a. Filaments free or inter- 

 laced. 



1. Filaments cylindrical, 

 colorless, articulations 

 not very distinct : 



Filaments very slen- 

 der, short . . . BACILLUS, Cohn. 



Filaments very fine, 

 long LEPTOTHRIX, Kg. 



Filaments larger, 

 long .... BEGGIATOA, Trev. 



2. Filaments cylindrical, 

 with phycochrome, 



articles well defined, 

 without cellular re- 

 production . . . 



HYPHEOTHRIX, Kg. 



OSCILLARIA, BOSC. 



