784 PROTOZOOLOGY 



anterior tentacle; eight to 10 ciliary rows about half the body-length 

 and starting a little distance away from the anterior tip; on mol- 

 lusks. 



H. tegularum Kozloff (Fig. 332, d). 26-36/x by 12-17/u by 9-12/z; 

 anterior end bent ventrally; nine ciliary rows, five rows on right be- 

 ing slightly longer than the other four; spherical macronucleus; para- 

 sitic on the ctenidium of Tegula brunnae (Kozloff, 1946). 



Genus Heterocinetopsis Jarocki. Body elongate, flattened dorso- 

 ventrally; a contractile tentacle, its canalicule extending 1/3-2/3 

 the body length; 10-12 ciliary rows; the median rows about one-half 

 the body length, the rows toward left being progressively longer; on 

 mollusks (Jarocki, 1935). 



H. goniobasidis (Kozloff) (Fig. 332, e). 36-48/x by 15-20/* by 11- 

 14:11) 10 ciliary rows; macronucleus pyriform; ovoid micronucleus 

 inconspicuous; parasitic on the epithelium of the gills and mantle of 

 Goniobasis plicifera silicula (Kozloff, 1946c). 



Genus Hypocomella Chatton and Lwoff (Hypocomidium Raabe). 

 Pyriform, asymmetrical, flattened; a long retractile tentacle; seven 

 to 13 ciliary rows on the ventral surface, three rows on left being 

 progressively longer; on mollusks (Chatton and Lwoff, 1922, 1950). 



H. phoronopsidis (Kozloff) (Fig. 332, f-h). 26-37/: by 11-16/* by 

 6.5-1 1/x; eight ventral ciliary rows; ovoid macronucleus and micro- 

 nucleus; on the tentacles of Phoronopsis viridis (Kozloff, 1945a). 



Genus Enerthecoma Jarocki. Pyriform, symmetrical; 8 ciliary 

 rows on the ventral side; three on left are somewhat separated from 

 five others and closely set; on the gills of mollusks. 



E. kozloffi Chatton and Lwoff (Fig. 332, i). 32-56/z by 13-21 n by 

 10-13/*; eight ciliary rows about 2/3 the body length; macronucleus 

 elongate ; micronucleus fusiform ; on the gills of Viviparus fasciatus 

 and V. malleatus (Kozloff, 1946c; Chatton and Lwoff, 1950). 



Genus Cepedella Poyarkoff . Pyriform with a pointed anterior end ; 

 macronucleus globular; without contractile vacuole. 



C. hepatica P. Body 16-26/x long; in the liver of Sphaerium cor- 

 neum. 



Family 6 Hypocomidae Butschli 



Genus Hypocoma Griiber. Dorsal side convex; ventral side flat- 

 tened with a ciliated oval field; a suctorial tentacle at the anterior 

 end; about 13 ciliary rows; an adoral zone, a short row (eight gran- 

 ules) at anterior-left side; on colonial Protozoa. 



H. parasitica G. (Fig. 333, a). 30-38/x by 18-20/x by 18/t; 13 ciliary 

 rows on the flattened surface: adoral zone, a short row; 11 general 



