CLASSIFICATION OF THE BACTERIA. 67 



Cells cylindrical . Bacterium, Duj. 

 2. Cells with phyco- 

 chrome, larger : 



Cells spherical . . Aphanocapsa, Nag. 

 Cells cylindrical . Aphanothece, Nag. 

 t. Intercellular substance 

 formed of several mem- 

 branes enclosed one with- 

 in the other : 



Cells spherical . . Glceocapsa, Kg. 

 Cells cylindrical . Glceothbce, Nag. 



C. Cells united in glairy fam- 

 ilies of definite form : 



a. Families of a single layer 

 of cells disposed in plates : 



1. Cells in fours form- 

 ing a plane surface . Merismopedia, Meyen. 



2. Cells without regular 

 arrangement, forming 

 a curved surface : 



Cells spherical, fam- 

 ilies with reticu- 

 lated rupture . . Clathrocystis, Henfr. 



Cells cylindrical, cu- 

 neiform, families 

 divided by con- 

 striction . . . CcELOSPHJSRnJM, Nag. 



b. Families with several lay- 

 ers of cells, united in spher- 

 ical corpuscles : 



1. Number of cells de- 

 termined : 



Cells spherical, col- 

 orless, arranged 

 in fours . . . Sarcina, Goods. 



