spirillum. 47 



67. S. Rugula (Miiller). 



Vibrio Rugula, Miiller (" Infus.," p. 44). 

 Melamlla ftexuosa, Bory. 

 Cells 6-16 \k long, about 

 •5-2 '5 /x thick, either only 

 simply axcuate, or with one 

 shallow spiral, bearing a 

 flagellum at each end, actively 

 rotating round its longitu- 

 dinal axis; the cells are 

 often felted in dense swarms. 

 Height of the spiral generally 

 6-IO /t, diameter -5-2 /<. pig. 45.-3, spirillum Ruguia; b, s. 



Spores always at the end of Und-uU (a, after Cohn ; b, after 



Koch's photographs). 



the cell, globose. (Fig. 451a!.) 



In bog-water, and various infusions ; also in the slime 

 of the teeth, etc. 



According to Warniiing, individuals occur the spiral of which reaches 

 a height of 13-20 fi and a diameter of 2'5-5 /*. Plasma granular. 



68. S. serpens (Miiller). 



Vibrio serpens, Miiller (" Infus.," p. 44). 



Cells half as Iproad as in the foregoing species, 11-28 

 (u. long (according to Rabenhorst), 'S-i'i /* thick, with 

 several, usually three or four, spirals ; often united in long 

 chains; with a flagellum at each end. Also frequently 

 forming swarms. Height of the spirals 8-12 /x, diameter 

 1-2-3 /*■ (Fig- 46 a, i.) 



In various infusions. 



The dimensions recorded by Rabenhorst (23-28 /i long) presumably 

 refer to threads composed of several cells. According to Warming, the 

 height of the spirals is sometimes as much as 22 /i. 



