Spiromonas. 45 



64. S. gigantea, Warming (I.e., Resume", p. 21). 



Threads cylindrical, blunt at both ends, about 3 //. thick, 

 with numerous spiral turns, the height of which is 25 ^, 

 the diameter 7-9 /*. Flexile. The articulations are not 



lueta gigantea ; a, X 166 ; i, X 660 (after Warming). 



visible, but at times the threads break up into joints. 

 Colour greyish. (Fig. 42.) 

 In sea-water. 



The longest specimens showed sixteen turns ; flagella have not 

 been discovered. 



.XIII. SPIROMONAS, Perty ("Zur Kenntniss der 



kleinsten Lebensformen," p. 171). 



Threads "flattened like a leaf, twisted round an imaginary 

 longitudinal axis." Multiplication by transverse division. 



65. S. volubilis, Perty (I.e.*). 



" Colourless, translucent [rounded at both ends], smooth, 

 without any obvious differentiation, motion 

 pretty swift, combined with a quick revolu- 

 tion round the axis about which the leaf- 

 like body is twisted. Body often twisted 

 very little, never forming more than a cir- 

 cumference. Length T^-^'"= i5-i8/*." 

 (Fig. 43-) 



Fig. 43. Spiromo- 

 nas volubilis, X 

 about 450 (after 

 Perty). 



