688 PROTOZOOLOGY 



with an outer pharyngeal membrane; 50-1 57/i by 35-99^; peristome 

 60-125m wide; stalk 50-4150^ by 5.6-12)u fresh water. 



V. convallaria (L.) (Fig. 323, d, e). Resembles the last-named 

 species; but anterior end somewhat narrow; usually without refrac- 

 tile granules in endoplasm; 50-95^ by 35-53/x; peristome 55-75/i 

 wide; stalk 25-460^ by 4-6.5iu; fresh water. 



Fig. 323. a-c, Vorticella campamda (a, X400; b, part of stalk, X800; 

 c, telotroch, X200); d, e, V. convallaria (d, X400; e, X800); f-p, V. micro- 

 stoma {i, g, X400; h, X 840 ; i, telotroch, X400; j-p, telotroch-formation 

 in vitro, X270); q, r, V. picta (q, X400; r, X800); s, t, V. monilatais, 

 X400; t, X800) (Noland and Finley). 



V. microstoma Ehrenberg (Fig. 323, f-p). 35-83m by 22-50^; 

 peristome 12-25^ wide; stalk 20-385/i by 1.5-4/x; common in fresh- 

 water infusion. 



