HOLOTRICHA 767 



U. biitschlii S. (Fig. 326, d). 20-25^ long (Kahl); 30-40/i (Schewi- 

 akoff ) ; in stagnant water. 



Genus Uronema Dujardin. Oval to elongate ovoid; slightly flat- 

 tened; anterior region not ciliated; inconspicuous peristome with 

 ciliated right edge; cytostome on the ventral side close to left border 

 in the anterior half, with a small tongue-like membrane; cytopharynx 

 indistinct; macronucleus spherical, central; contractile vacuole ter- 

 minal; in salt or fresh water. Comparison with Cyclidium (Parducz, 

 1940). 



U. marinum D. (Fig. 326, e). 30-50/x long; in salt water among 

 algae. Structure (Parducz, 1939). 



U. pluricaudatum No land (Fig. 326, /, g). Body appears to be 

 twisted in dorsal view, due to a spiral depression that runs obliquely 

 down toward cytostome; with about 8 caudal cilia; in salt water; 

 Florida (Noland, 1937). 



Genus Homalogastra Kahl. Broad fusiform; furrows spiral to left; 

 a long caudal cilium; a group of cilia on right and left side of it; 

 macronucleus spherical, anterior; contractile vacuole posterior; in 

 fresh water. 



H. setosa K. (Fig. 326, h). About 3(V long; fresh water. 



Genus Stokesia Wenrich. Oblique cone with rounded angles; flat 

 anterior surface uniformly ciliated; with peristome bearing zones of 

 longer cilia, at the bottom of which is located the cytostome; a 

 girdle of longer cilia around the organism in the region of its greatest 

 diameter; pellicle finely striated; with zoochlorellae; trichocysts; 

 free-swimming; in freshwater pond. One species (Wenrich, 1929). 



S. vemalis W. (Fig. 326, i,j). 100-16G> in diameter; macronucleus; 

 2-4 micronuclei; fresh water. 



Family 2 Ophryoglenidae Kent 



Genus Ophryoglena Ehrenberg. Ellipsoidal to cylindrical; ends 

 rounded or attenuated; preoral depression in form of '6' due to an 

 ectoplasmic membrane extending from the left edge, cilia on the 

 right edge; cytostome deep-seated; 1 (or 2) contractile vacuole with 

 long radiating canals, opens through pores on right ventral side; 

 macronucleus of various forms with several endosomes; a micro- 

 nucleus; fresh or salt water or parasitic. Many species. 



0. collini Lichtenstein (Fig. 326, k). Pyriform; macronucleus 

 horseshoe-shape; 200-300^ by 120-230/z; in the caecum of Baetis 

 larvae. 



O. parasitica Andre. Ovoid; dark; micronucleus (?); 170-350/x by 

 180-200/z; in the gastro vascular cavity of Dendrocoelum lacteum. 



