HOLOTRICHA 727 



cleus bandform, moniliform or divided into numerous independent 

 bodies; fresh or salt water. Many species. 



D. americanus Kahl (Fig. 310, b). Proboscis bent dorsally sickle- 

 like; macro nucleus made up of 2 sausage-shaped or often horseshoe- 

 shaped parts; 2 contractile vacuoles on dorsal side; 200/x long; in 

 mosses. 



D. anser (Miiller) (Fig. 310, c). Proboscis slightly flattened; macro- 

 nucleus divided into 100 or more discoid bodies; 16 or more vesicular 

 micronuclei (Jones, 1951) ; contractile vacuoles in a row on the aboral 

 surface, with 2-3 in proboscis; 250-400 ju, sometimes up to 600/z long; 

 in fresh water. Culture, encystment and excystment (Jones, 1951). 



Genus Paradileptus Wenrich (Tentaculifera Sokoloff). Body 

 broader at the level of cytostome; with a wide peristomal field that 

 bears the cytostome and is surrounded for 2/3-3/4 its circumference 

 by a raised rim which is continuous anteriorly with the spirally 

 wound proboscis; trichocyst-zone traversing the rim and anterior 

 edge of proboscis; contractile vacuoles small, numerous, distributed; 

 macronucleus segmented ; fresh water (Wenrich, 1929a). 



P. conicus W. (Fig. 310, d). 100-200m by 50-1 00/z. 



P. robustus W. (Fig. 310, e). 180-450/x long. 



P. estensis Canella. 600-800^ long; feeds on rotifers (Canella, 

 1951). 



Genus Branchioecetes Kahl. Preoral part somewhat like that of 

 Amphileptus, and bent dorsally; ventral side of neck with 2 rows of 

 trichocysts; cytostome at posterior end of neck; cytopharynx with 

 trichocysts; ectocommensals on Asellus or Gammarus. 



B. gammari (Penard) (Fig. 310,/). 130-200^ long; on Gammarus. 



Family 3 Loxodidae Butschli 



Genus Loxodes Ehrenberg. Lancet-like; strongly compressed; an- 

 terior end curved ventrally, and usually pointed; right side slightly 

 convex; uniform ciliation on about 12 longitudinal rows; ectoplasm 

 appears brownish, because of closely arranged brownish protricho- 

 cysts; endoplasm reticulated; 2 or more vesicular macro nuclei; one or 

 more micronuclei; 5-25 Miiller's vesicles (p. 87; Fig. 31, a, b) in dor- 

 sal region; fresh water. 



L. vorax Stokes (Fig. 310, g). 125-140/z long; yellowish brown, a 

 row of slightly longer cilia; sapropelic in standing fresh water. 



L. magnus S. (Fig. 310, h). Extended about 700m long; dark brown; 

 12-20 or more Miiller's vesicles in a row along dorsal border; stand- 

 ing pond water. 



Genus Remanella Kahl. Similar to Loxodes in general appearance; 



