HOLOTRICHA 509 



2 macroniiclei; 2 contractile vacuoles; extended forms 400-500/^ 

 up to 1.2 mm. long; when dividing, long neck is formed sidewise 

 so that it appears as oblique division (Penard); fresh and salt 

 water. 



L. lagenula Claparede et Lachmann (Fig. 234, b). Body flask- 

 shape; neck highly extensible; striation distinct, spiral when 

 contracted; macronucleus short sausage-like or horseshoe-shape; 

 endoplasm granulated; body 70/x long, up to loOfj, (Kahl); salt 

 water. 



L. coronata C. et L. (Fig. 234, c). Large; neck extensible; body 

 form variable, but usually with bluntly pointed posterior end; 

 endoplasm appears dark; striae spiral; 85-100^ long; salt and 

 brackish water. 



Genus Enchelys Hill. Flask-shape; anterior end obliquely 

 truncate; cytostome slit-like, rarely round; fresh or salt water. 

 Several species. 



E. curvilata (Smith) (Fig. 234, d). Elongate ovoid; posterior 

 end rounded; longitudinal striation; macronucleus band-form; 

 contractile vacuole terminal; endoplasm yellowish, granulated; 

 about loOyu long; fresh water among algae. 



Genus Crobylura Andre. Body when extended spindle-form, 

 with truncate ends; when contracted, thimble-form; cilia short 

 and thick; several long caudal cilia; slit-like cytostome at anterior 

 end; no apparent cytopharynx; macronucleus irregularly 

 rounded, hard to stain; micronucleus not observed; contractile 

 vacuole latero-posterior; fresh water. One species. 



C. pelagica A. (Fig. 234, e). Body 65-95^ long; in freshwater 

 plankton. 



Genus Microregma Kahl. Small, ovoid; dorsal side convex; 

 ventral side flat; with a small slit-like cytostome near anterior 

 end; with or without caudal bristle; fresh or salt water. 



M. (Enchelys) auduboni (Smith) (Fig. 234, /). Body plastic; 

 coarsely cihated; caudal bristle thin; cytostome at anterior end, 

 surrounded by longer ciha; cytopharynx small with trichocysts; 

 round macronucleus central; contractile vacuole near posterior 

 end; 40-55)u; fresh water. 



Genus Chaenea Quennerstedt. Elongate; anterior end drawn 

 out into a narrow truncated 'head'; but without any ring furrow; 

 'head' spirally or longitudinally furrowed; often with longer cilia 

 directed anteriorly; cytostome terminal, not lateral; cytopharynx 



