66 MORPHOLOGY OF THE BACTERIA. 



Finally, the spiral filaments of the spirobacte- 

 ria characterize the gr. Spirillum and Spirochceta, 

 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 oscillatoriacese and of chroococ- 

 ceae, 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. GL^OGENES. 



Cells free or united in glairy families by an intercellular substance. 



A. Cells free or united by 2 or by 4 : 



Cells spherical . . CHROOCOCCUS, Nag. 

 Cells cylindrical . SYNECHOCOCCUS, 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. 



