490 PROTOZOOLOGY 



to one side; 12 longitudinal ciliary furrows; below ectoplasm, a 

 layer of refringent material; endoplasm sparse; macronucleus 

 basket-like, large, with a spacious hollow; a micronucleus; no 

 contractile vacuoles. One species. 



M. sagittae I. (Fig. 226, d). About 250m by 130^; in the body- 

 cavity of Sagitta sp. 



Genus Perezella Cepede. Ovoid; ventral surface concave, 

 serves for attachment; macronucleus ellipsoid; contractile vacu- 

 ole terminal; longitudinally, uniformly, ciliated. A few species. 



P. pelagica C. (Fig. 226, e). In coelom of copepods (Ascartia, 

 Clausia, Paracalanus) ; about 48/x long. 



Genus Dogielella Poljansky. Pyriform; longitudinal ciliary 

 rows; contractile vacuole terminal; macronucleus spherical, with 

 a spherical or elliptical micronucleus; in parenchyma of flat- 

 worms or molluscs. 3 species. 



D. sphaerii P. (Fig. 226, /). 40-100^ by 25-54/^; in Spaerium 

 corneum. 



D. minuta P. (Fig. 226, g). 12-28^ by up to 20)u; in Stenostomun 

 leucops. 



D. Virginia (Kepner et Carroll) (Fig. 226, h). 40-50)u long; in the 

 same host animal; Virginia. 



Genus Orchitophrya Cepede. Elongate pyriform; ciliary rows 

 oblique; macronucleus spherical, central. One species. 



0. stellarum C. (Fig. 226, i). In gonads of the echinoderm, 

 Asteracanthion (Asterias) ruhens; 35-65)U long. 



Genus Kofoidella Cepede. Pyriform; macronucleus broadly 

 oval; contractile vacuole, subterminal. One species. 



K. eleutheriae C. (Fig. 226, j). In gastro-vascular cavity of the 

 medusa, Eleutheria dichotoma; 30-80/x long. 



Genus Herpetophrya Siedlecki. Ovoid; with a pointed, mobile, 

 tactile, non-ciliated cone; macronucleus globular; without con- 

 tractile vacuole. One species. 



H. astomata S. In coelom of Polymnia (annelid). 



Genus Butschliella Awerinzew. Elongate with pointed anterior 

 end, with non-ciliated retractile anterior cap; cilia in compara- 

 tively few (about 10) slightly spiral rows; macronucleus band- 

 form; several contractile vacuoles in a longitudinal row. Several 

 species. 



B. opheliae A. (Fig. 226, k). In Ophelia limacina; 280-360ju by 

 35-50m. 



