SPIROTRICHA, HETEROTRICHA 807 



stalk, often housed in a gelatinous tube; on body surface 3-4 longer 

 and stiff cilia grouped among cilia; macronucleus moniliform. 



S. roeseli Ehrenberg (Fig. 344, h). 0.5-1 mm. long; anterior end 

 expanded; body surface with groups of longer cilia; posterior por- 

 tion drawn out and often housed in a gelatinous tube; macronucleus 

 long band-form. 



S. igneus E. (Fig. 344, i). Rose-colored or colorless; 200-4CHV 

 long; macronucleus oval; ciliation uniform. 



S. niger (Miiller). Yellowish or brown; macronucleus oval; 200- 

 300/x long. 



S. multiformis (M.) Dark blue to bluish green; anterior end not 

 expanded; 150-200^ long; macronucleus oval. 



S. amethystinus Leidy (Fig. 344, j). Habitually pyriform (con- 

 tracted); amethyst-blue; with zoochlorellae; 300-600/z long; macro- 

 nucleus oval. 



S. pyriformis Johnson. When extended 500/x long; anterior end 

 200/x in diameter. 



Genus Fabrea Henneguy. Pyriform; posterior end broadly round- 

 ed, anterior end bluntly pointed; peristome extends down from 

 anterior end 2/5 or more the body length, its posterior portion 

 closely wound; peculiar black spot beneath membranellae in anterior 

 portion of spiral adoral zone, composed of numerous pigment gran- 

 ules; without contractile vacuole; macronucleus, a sausage-shaped 

 body or in 4 parts; in salt water. 



F. salina H. (Fig. 345, a, b). 120-220/* by 67-125/i (Kirby); 130- 

 450/z by 70-200/x (Henneguy); cysts ovoidal, with gelatinous enve- 

 lope; 89-1 11m by 72-105ju. Kirby (1934) found the organism in 

 ditches and pools in salt marshes, showing salinities 7.5-20.1 per 

 cent in California. 



Genus Climacostomum Stein. Oval; flattened; right edge of peri- 

 stome without membrane, left edge, semicircular or spiral with a 

 strong adoral zone; peristomal field ciliated; cytopharynx a long 

 curved tube with a longitudinal row of cilia; macronucleus band- 

 form; contractile vacuole terminal, with two long canals; fresh or 

 brackish water. 



C. virens (Ehrenberg) (Fig. 345, c). 100-300/x long; with or without 

 zoochlorellae; fresh and brackish water. 



Family 6 Folliculinidae Dons 



Genus Folliculina Lamarck. Horny or chitinous lorica (Fig. 345, 

 d) attached on broad surface; neck of the lorica oblique to perpen- 

 dicular; sometimes with a collar or spiral ridge; neck uniform in 



