5O Synopsis of the Bacteria and Yeast Fungi. 



As much as 3 /x, thick, spirals elongated, each 5-10 /x 

 high, diameter ^ or ^ of the height (Fig. 49.) 

 On the shores of the Baltic Sea. 



[71. S. amyliferum, Van Teighem (Bull. Soc. Bot. 

 France, 1879, p. 66). 



Motile. Spiral of 24 turns, diameter of spiral 34 ft, 

 height 6-9 fji. Thickness of thread i'2-i'5 /*. At each 

 end a delicate flagellum. When growth has ceased, the 

 contents become amylaceous, so as to be coloured blue by 

 iodine, except at one place in each cell, where a spore is 

 afterwards formed. Spores oval, strongly refringent, 2 -5-3 p. 

 long, i -5 p. broad. 



Each turn of the spiral is usually occupied by one cell, and forms 

 one spore. When the spiral has grown to four turns, two lateral septa 

 are formed, and the four cells separate into two equal portions, by the 

 solution of the intermediate layer of the median partition. While in 

 active growth the cell-contents are coloured yellow by iodine. The 

 spores are always placed at the end of a cell. In germinating, they 

 throw out a tube, which soon becomes curved, and then spiral. When 

 it has taken two turns, a central partition is formed. The similarity of 

 this to the formation and germination of a Bacillus spore is noticeable ; 

 S. amyliferum is most probably only a phase of B. Amylobacter, in 

 company with which it was found.] 



72. S, volutans, Ehrenberg (Abhandl., 1830, p. 38). 

 Vibrio Spirillum, Miiller. 

 Melanella Spirillum, Bory. 



Cells slightly attenuated towards the ends, gently 

 rounded, 25-30 p, long, about i'5~2 p. thick ; each cell with 

 2^-3^ (seldom more) spirals, the spiral 9-13 p, high, 6*5 p. in 

 diameter ; a flagellum at each end. (Fig. 46*.) 



In various infusions, as well as in bog-water among Algae. 



According to Warming, the spirals are often elongated, so that the 

 cell appears almost straight ; the diameter then amounts to only 1-5-4 M- 



