Marks , employed for classify mg the Schizomycetes . 1 1 r 
(i) Cells devoid of phycochrome, very small. 
Micrococcus (Hall, emend.). Cells globular. 
Bacterium (Duj.). Cells cylindrical. 
(ii) Cells containing phycochrome, larger. 
Aphanocapsa (Naeg.). Cells globular. 
Aphanothece (Naeg.). Cells cylindrical. 
(/3) Intercellular substance stratified concentrically into shells. 
Gloeocapsa (Kg., Naeg.). Cells globular. 
Gloeothece (Naeg.). Cells cylindrical. 
C. Cells united into definitely circumscribed zoogloea-masses. 
(a) Families in flat layers, arranged in one plane. 
(i) Cells in fours, arranged in one plane. 
Merismopedia (Meyen). 
(ii) Cells irregularly arranged on the periphery of a sphere. 
Clathrocystis (Henfr.). Families clathrate. Cells 
spherical. 
Coelosphaerium (Naeg.). Cells cylindroid- wedge- 
shaped : families forked. 
(d) Colonies aggregated into spheroidal, many-layered masses. 
(i) Numbers of cells definite. 
Sarcina (Goods.). Cells in fours, globoid, colourless. 
Gomphosphaeria (Kg.). Cells cylindroid-wedge- 
shaped, irregularly disposed, containing phyco- 
chrome. 
(ii) Numbers of cells large and indefinite. 
Ascococcus (Billr. emend.). Cells colourless, very 
small. 
Polycystis (Kg.). \ . 
^ 7 7 • / o \ ( Cells larger, and contain- 
Loccochlons (Spr.). > , , 
Polycoccus (Kg.), &c. 1 mg P h y cochrome ' 
Tribe II. Nematogenae (Rab.). 
Cells arranged in filaments. 
A. Filaments always unbranched. 
(a) Filaments free or matted together. 
(i) Filaments cylindrical, colourless, and obscurely 
segmented. 
Bacillus (Cohn). Filaments very thin and short. 
