66 MORPHOLOGY OF THE BACTERIA. 
Finally, the spiral filaments of the spirobacte- 
ria characterize the gr. Spirillum and Spirocheta, 
which might be united in a single genus compris- 
ing Sp. plicatile, tenue, undula, and volutans. 
Since then, Cohn, struck with the affinities 
which each of the preceding genera presents with 
several genera of oscillatoriaceze and of chroococ- 
cexe, from which the bacteria only differ by the 
absence of chlorophyll, has established a class of 
Schizophytes, which includes all the inferior vege- 
table organisms, provided or not with chlorophyll, 
multiplying by fission. 
We give below the complete table : — 
2. Classification of the Schizophytes, Cohn. 
TRIBE 1.— GLAOGENES. 
Cells free or united in glairy families by an intercellular substance. 
A. Cells free or united by 2 or by 4: 
Cells spherical . . CHRroococcus, Nag. 
Cells cylindrical . SyNEcHOcOoccUS, Nag. 
B. Cells united in glairy families, 
amorphous in state of 
repose : 
a. Cellular membrane, con- 
founded with the intercel- 
lular substance : 
1. Cells without phyco- 
chrome, very small : 
Cells spherical . . Micrococcus, Hallier. 
