Sphcsrotilus. 53 



77. S. Jenense (Ehrenberg). 



Ophidomonas Jenensis, Ehrenberg (" Infusions- 

 thierchen," p. 44) 



Cells obtuse at both 

 ends, with flagella, 

 olive-brown, 40 fi, long, 

 about 3g^ /«. thick, with 



1 1 • 1 , T-i* \ Fig* 55* — Spirillum Jenense, X 600 (after 



5-4 spirals. (Fig. 55.) EhrenWg). 



Whether this is really a distinct species is hard to say, so long 

 as it is not found again in the original locality. Possibly it is identical 

 with 6". volutans. 



[Saville Kent classes this as a true monad (see "Manual of the 

 Infusoria," p. 244). Warming thinks it may be identical with 0. 

 sanguinea. — Tr.] 



Appendix. 



With the Schizomycetes we may range several other 

 genera which are partly united with them by others without 

 remark, but which present so great peculiarities that it will 

 be better provisionally to separate them. 



XV. SPH/EROTILUS, Kiitzing. 



Cells roundish-angular or oblong, rounded at the comers, 

 united in great numbers in a colourless gelatinous sheath 

 to form long threads, which are densely tufted and en- 

 tangled in floating flakes. Multiplication by means of 

 vegetative cells, which isolate themselves and then form 

 new threads by continued subdivision. Reproduction by 

 spores, which are produced endogenously within the vege- 

 tative cells. 



78. S. natans, Kiitzing (Linnxa, 1833, p. 385). 

 Flakes in the vegetative stage yellow-brown in the 



