70 MORPHOLOGY OF THE BACTERIA. 



B. Filaments with false ramifi- 

 cation : 



1. Filaments cylindri- ) Cladothrix, Cohn. 

 cal, colorless . . ) Streptothrix, Cohn. 



2. Filaments cylindri- ) „, . 



, vi -u f Calothrix, As. 



cal, with pnyco- } _ . 



, \ SCYTONEMA, Ag. 



chrome . . . . ; ° 



3. Filament in chaplets . Merizomyria, Kg. 



Schizosiphon, K 

 Geocyclus, Kg. 



4 Filaments flagelli- i ScHIZ0SIPH0N5 K g. 

 torm, slender towards l 



the extremity . 



An inspection of this table shows that each of 

 the genera of the ancient group of the bacteria 

 has been placed beside some genus of oscillatori- 

 acese, which it resembles by its organization, — 

 Micrococcus and Bacterium, beside Aphanothece 

 and Aphanocapsa ; Bacillus, beside Leptothrix 

 and Beggiatoa ; Vibrio and Spirillum, beside Spi- 

 rulina. 



These affinities are undeniable, and the advan- 

 tages of such a classification are manifest ; but, in 

 a work like this, we cannot think of employing it. 

 We preserve, then, in a distinct group the schizo- 

 phytes deprived of chlorophyll, which may be 

 arranged in the four primary divisions of Cohn 

 with the exception of Sarcina, Ascococcus, Creno- 

 ihrix, etc., and the other genera created recently 

 by this botanist. 



Thus we will describe successively : — 



1. The Spherobacteria of Cohn ; and beside them 

 the different Monas recently studied, — the Microcoe- 



