856 



PROTOZOOLOGY 



Kahl, 1935; Nenninger, 1948); movements of food vacuoles (Hall 

 and Dunihue, 1931). 



V. campanula Ehrenberg (Fig. 363, a-c). Usually in groups; endo- 

 plasm filled with refractile reserve granules; vestibule very large 

 with an outer pharyngeal membrane; 50-157/* by 35-99/*; peristome 

 60-125/* wide; stalk 50-4150/* by 5.6-12/* fresh water. 



V. convallaria (L.) (Fig. 363, d, e). Resembles the last-named 

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

 tile granules in endoplasm; 50-95/; by 35-53/*; peristome 55-75/* 

 wide; stalk 25-460/* by 4-6. 5m ; fresh water. 



V. microstoma Ehrenberg (Figs. 86; 363, f-p). 35-83 /* by 22-50/*; 

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

 water infusion. Conjugation (Finley, 1943); encystment (von Brand, 

 1923). 



V. picta (E.) (Fig. 363, q, r). 41-63/* by 20-37/*; peristome 35-50/*; 

 stalk 205-550/* by 4-7/*; 2 contractile vacuoles; with refractile gran- 

 ules in stalk ; fresh water. 



V. monilata Tatem (Fig. 363, s, t). Body with pellicular tuber- 

 cles composed of paraglycogen (Faure-Fremiet and Thaureaux, 

 1944); 2 contractile vacuoles; 50-78/* by 35-57/t; peristome 36-63/* 

 wide; stalk 50-200/* by 5-6.5/*; fresh water. 



Genus Carchesium Ehrenberg. Similar to Vorticella; but colonial; 

 myonemes in stalk not continuous, and therefore individual stalks 

 contract independently; attached to fresh or salt water animals or 

 plants; occasionally colonies up to 4 mm. high. Several species (Kahl, 

 1935; Nenninger, 1948). 



Fig. 364. a, Carchesium polypinum, X200 (Stein); b, C. granulatum, 

 X220 (Kellicott); c, Zoothamnium arbuscula, X200 (Stein); d, Z. adamsi, 

 XI 50 (Stokes). 



