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 /x, 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, Ehrb. 



Cells cylindrical; average length 7 to 15 fi (Cohn), 

 10 fM (Ehrb.), sometimes from 60 to 80 //. (Warming), 

 diameter 5 /x ; of a beautiful red color, having a rapid 

 gyratory 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. Warmingii, Cohn. 



Cell cylindrical, pink, containing at its two rounded 

 extremities some deep-red granules ; length 15 to 

 20 fi, width 8 fi ; movement uncertain, having a vi- 

 bratile cilium. Hab., brackish water on the coast 

 of Norway (Warming). 



M. gracilis, Warming. 



Cells straight, cylindrical, pink, rounded at the 

 two extremities ; length 60 /z, thickness 2 fi ; move- 

 ment slow. Hab., fresh water. 



