PERITRICHA 



621 



Family 5 Vorticellidae Fromental 



Genus Vorticella Linnaeus. Inverted bell-form; colorless, yel- 

 lowish, or greenish; peristome more or less outwardly extended; 

 pellicle sometimes annulated; with a contractile stalk, macro- 



FiG. 281. a-c, Vorticella campanula (a, X400; b, part of stalk, 

 X800; c, telotroch, X200); d, e, V. convallaria (d, X400; e, XSOO); 

 f-p, V. microstoma (f, g, X400; h, X840; i, telotroch, X400; j-p, telo- 

 troch-formation in vitro, X270); q, r, V. picta (q, X400; r, X800); 

 s, t, V. monilata (s, X400; t, X800) (All, Noland and Finley). 



nucleus band-form; micronucleus; 1-2 contractile vacuoles; soli- 

 tary; in fresh or salt water, attached to submerged objects. 

 Noland and Finley (1931) gave an excellent taxonomic considera- 

 tion of the genus. Numerous species. 



