68 MORPHOLOGY OF THE BACTERIA. 



Cells cylindrical, cu- 

 neiform, with phy- 

 cochrome, with- 

 out regular ar- 

 rangement . . GOMPHOSPILERIA, Kg. 

 2. Number of cells very 

 great and indetermi- 

 nate : 



Cells colorless, very 



small .... Ascococcus, Billr. 

 Cells colored by ) Polycystis, Kg. 

 phycochrome > Coccochloris, Spr. 

 and larger . . ) Polycocctjs, 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, I TT 



articles well defined, ( Hwheothrix, Kg. 

 without cellular re- °^laria, Bosc. 

 production . . . / 



