CLASSIFICATION OF THE BACTERIA. 79 
As in the case of the Micrococci it is very 
probable that the Monads are only the spores, or 
lower forms of bacteria higher in the scale. Cohn 
places the Monas vinosa of Ehrenberg with the 
Clathrocystis roseopersicina, Cohn (Bacterium ru- 
bescens, Ray-Lank.), considering it a spore of the 
latter. 
Monas vinosa, Ehrb. 
Cells spherical, oval, regular, of 2.5 u, often united 
in pairs, formed of a pink substance with granules of 
a deeper color, having spontaneous movements. Hab., 
waters containing decomposing vegetable matters 
(Ehrb. 1838, Ch. Morren 1841, Perty 1852, Cohn 
1875). 
M. Okenii, Erb. 
Cells cylindrical; average length 7 to 15 » (Cohn), 
10 » (Ehrb.), sometimes from 60 to 80 w (Warming), 
diameter 5 w; of a beautiful red color, having a rapid 
eyratory movement, with a cilium at the posterior 
extremity or two cilia at the two extremities. Hab., 
stagnant water (Ehrb. 1836, Eichwald, Weiss, Cohn, 
Etc.,). 
M. Warmingi, Cohn. 
Cell cylindrical, pink, containing at its two rounded 
extremities some deep-red granules; length 15 to 
20 uw, width 8 ~; movement uncertain, having a vi- 
bratile cilium. Had., brackish water on the coast 
of Norway (Warming). 
M. gracilis, Warming. 
Cells straight, cylindrical, pink, rounded at the 
two extremities; length 60 yw, thickness 2 4; move- 
ment slow. Hab., fresh water. 
