70 MORPHOLOGY OF THE BACTERIA. 
B. Filaments with false ramifi- 
cation: 
1. Filaments  cylindri- CLADOTHRIX, Cohn. 
cal, colorless STREPTOTHRIX, Cohn. 
2. Filaments  cylindri- | CALOTHRIX, Ag. 
l, s h ] We) = 
cal, with phyco SCYTONEMA, Ag. 
chrome ie 
8. Filament in chaplets. MerizomyriA, Kg. 
4. Filaments flagelli- 
form, slender towards 
the extremity . 
SCHIZOSIPHON, Kg. 
GEOCYCLUS, Kg. 
_ 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- 
aces, 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- 
thrix, 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 Miecrococ- 
