214 BACTERIOLOGY. 



wide, 8 15 p long, with rounded ends. They 

 undergo lively movements, each end being pro- 

 vided with a flagellum twice as long as the cell 

 itself. They have pale-red cell-substance with dark 

 grains. They occur in stagnant water. 



Rhabdomonas rosea. Spindle-form cells, 3*8 

 5*0 /A broad, 20 30 p, long. They exhibit slow, 

 trembling movements, having at each end of the 

 cell a flagellum. The cell-substance is very pale 

 with dark grains interspersed. In brackish water. 



Monas Warmingii. Cylindrical cells, rounded 

 at the ends; 15 ^ long, 5 8 p broad. They are 

 possessed of a flagellum at each end of the cell, and 

 exhibit rapid, irregular movements. The cell sub- 

 stance is pale-red, and studded at the rounded ends 

 with dark-red grains. 



Proteus vulgaris. This and the two following 

 species have been recently described * as present in 

 putrefying meat infusion, and as being intimately 

 connected with the process of putrefaction. In the 

 history of their development coccoid, bacterioid, 

 spindle-form, spirulinar, and involution forms have 

 been described, and the name " Proteus" has been 

 suggested for this order. In Proteus vulgaris the 

 bacteria vary in size; some measure 4 //, in length, 

 and are almost as broad as long, and others vary 

 from -94 1-25 //, long and -42 '63 wide. They 

 are actively motile, and cultivated on nutrient 

 gelatine they convert it into a turbid, greyish-white 



* Hauser, Ueber Fdulniss-Bacterien. 1885. 



