BACTERIA, NOT CLASSIFIED. 



713 



the bacilli accumulate in zooglcea masses ; later the liquefaction extends to 

 the deeper layers of the gelatin medium. Upon agar, in the course of two or 

 three days at the room temperature, or in twenty-four hours in the incubat- 

 ing 1 oven, rather scanty and thin, whitish or yellowish colonies are developed, 

 which remain separated where the culture medium is scanty, as at the upper 

 part of oblique cultures, while below, where the culture medium is moist, 

 development is more abundant. In bouillon an abundant development 

 occurs, which causes a diffused cloudiness of the liquid and a considerable 

 deposit at the bottom of the tube. The growth upon potato is quite charac- 

 teristic. At the end of twenty- four hours at the room temperature a moist, 

 white, shining patch is seen ; instead of extending over the surface, this in- 

 creases in thickness, forming a thick, viscid, shining-white mass; later this 

 loses its lustre, becomes dull and waxy in appearance, and acquires a 

 brownish color. 



445. BACILLUS LIMOSUS (Russell). 



Obtained by Russell (1891) from mud from the bottom of the Gulf of 

 Naples ; very abundant in all of the specimens examined. 



FIG. 261. FIG. 262. 



FIG. 261. Bacillus limosus; culture in nutrient gelatin made with sea water, at end of two 

 days, and bacilli from a gelatin culture. (Russell.) 



FIG. 262. Spirillum marinum; culture in nutrient gelatin made with sea water, at end of two 

 days, and spirilla. (Russell.) 



Morphology. Long and slender bacilli, 1.25 u broad and 3 to 4 n long; 

 usually united in pairs, or in chains containing several elements. In hang- 

 ing-drop preparations from potato cultures the cells are shorter and thicker 

 than in gelatin cultures ; the ends are rounded, and the cell contents often 

 appear finely granular. 



Biological Characters. Anaerobic, liquefying, motile bacillus ; exhibits 

 slow to-and-fro movements. Forms spores, which are located at one ex- 

 tremity of the rods. Grows in the usual media at the room temperature 



