STATE -NORMAL SCHWtt, 



LoAn C ele.,Cal. 



Spirillum. 49 



70. S. Undula (Mailer), Ehrenberg (AbhandL Berlin. 



Akad., 1830, p. 38). 

 Vibrio Undula, Muller. 

 V. prolifer, Ehrenberg. 



Cells 8-12 p. long, 1-1-1-4 P thick (according to Raben- 

 horst); spirals wider than in the foregoing, 4-5 p. high; 

 each cell for the most part embracing only ^ or i, seldom 



Fig. 48. Spirillum Undula, X 3000 (after Dallinger). 



i \ to 2 or 3 spirals; a flagellum at each end. Very 

 actively motile, at times also forming a zooglcea. (Figs. 

 45^, 46^, 48.) 



In bog-water and various infusions. 



Ehrenberg gives for S. tenue a thickness of -^ 

 of a line, for S. Undula only ^ of a line ; at the 

 same time, he says in the description, " Sp. fibris 

 valde tortuosis brevibus, validioribus." 



According to Warming, 5". Undula is more variable 

 than was formerly admitted. The spirals are often 

 elongated, so that the cell appears almost straight ; 

 accordingly the height of the spirals varies from 3 to 

 io - 5 fi, the diameter amounts to ={, or -f of the height, 

 the thickness of the cells "6-1-3 M- 



Var. liter ale, Warming (I.e., 

 sume, p. 23). 



Re- 



Fig. *,<). Spirillum 

 Undula, var. //- 

 torale, X 66o(after 

 Warming). 



