48 



Synopsis of the Bacteria and Yeast Fungi. 



Fig. 46. — a, Spirillum serpens; h, the same, felted in a "swarm ;" 

 c, S. ienue; d^ S. Undula. : e, S. volutans, X 650 (after Cohn). 



69. S. tenue, Ehrenberg (" Die Infusionsthierchen.," 

 p. 84). 



Cells very slender, 4-15 /x long, about 2-25 fi. thick 

 (according to Ehrenberg), with at least 

 i^, usually, however, 2, 3, 4, or 5 spirals. 

 Height and diameter of the spirals about 

 1.5-4 ft., or the diameter amounts to half 

 the height. Moving very swiftly, but also 

 often almost motionless and felted in 

 dense swarms or masses, or united in a 

 zoogloea. (Figs. 46^, 47.) 

 In various infusions. 



According to Warming, only 1 fj. thick, and the 

 spirals at times 8-10 ju high, with the diameter §-1^ 

 of the height. There appears to be some confusion between S. tenue 

 and S. Undula. 



Fig. 47. — Spirillum 

 tenuet X 660 (after 

 Warming). 



