SPIROTRICHA, HETEROTRICHA 803 



S. ambiguum E. (Figs. 38; 343, a). 1-3 mm. long; macronucleus 

 composed of many beads; many micronuclei; peristome 2/3 the 

 body length; fresh water. Regeneration (Seyd, 1936); irritability 

 (Blattner, 1926). 



S. minus Roux (Fig. 343, b). 500-800/x long; macronucleus 

 chain-form; in fresh and salt water (Kahl). 



S. loxodes Stokes (Fig. 343, c). About 300m long (length: width, 

 6-7:1); peristome about 1/3 the body length; oblique striation; 

 longer cilia at ends; macronucleus chain-form; fresh water. 



S. intermedium Kahl (Fig. 343, d). Slender; 400-600/x long; macro- 

 nucleus chain-form; fresh water. 



S. teres Claparede and Lachmann (Fig. 343, e). 150-400m long; 

 macronucleus oval; in fresh water and also reported from salt water. 



S. filum (E.) (Fig. 343, /). Peristome 1/4 the body length; poster- 

 ior end drawn out; 200-300/* up to 700/t long; fresh water. 



Genus Gruberia Kahl. Similar to Spirostomum in general appear- 

 ance; but posterior end drawn out; slightly contractile; contractile 

 vacuole posterior; macronucleus compact or beaded ; salt water. 



G. calkinsi Beltran (Fig. 343, g). 200-800^ long; peristome 2/3 

 the body length; many (contractile?) vacuoles distributed; monili- 

 form macronucleus; many micronuclei; Woods Hole (Beltran, 1933). 



Genus Blepharisma Perty. Pyriform, spindle-form or ellipsoid; 

 somewhat narrowed anteriorly; compressed; peristome on the left 

 border, which is twisted to right at posterior end and connected 

 with oral funnel with membrane; in front of cytostome a 2-layered 

 undulating membrane on right edge; ciliary rows longitudinal; cilia- 

 tion dense; contractile vacuole and cytopyge terminal; macronu- 

 cleus one or divided into several parts; several species rose-colofea 1 ; 

 fresh or salt water. Many species. 



B. lateritium (Ehrenberg) (Fig. 342, g). 130-200/z long; pyriform; 

 macronucleus oval; a micro nucleus; rose-colored; fresh water among 

 decaying leaves. 



B. persicinum P. (Fig. 342, A). 80-1 20ju long; elongate oval; 

 posterior end pointed; left peristomal edge sigmoid; preoral mem- 

 brane large; macronucleus in 3-7 parts; rose-colored; fresh water 

 among decaying vegetation. 



B. steini Kahl (Fig. 342, i). 80-200^ long; macronucleus ovoid; 

 reddish to colorless; fresh water in sphagnum. 



B. undulans Stein. 150-300/z long; macronucleus in 2 parts; un- 

 dulating membrane long; cytopharynx directed posteriorly; fresh 

 water among decaying vegetation. Contractile vacuole (Moore, 

 1934); influence of light on color (Giese, 1938) (p. 46); morphology 



