554 PROTOZOOLOGY 



ket-like, large, with a spacious hollow; a micronucleus; no contractile 

 vacuoles. One species. 



M. sagittae I. (Fig. 264, d). About 250/x by ISO/z; in the body cavity 

 of Sagitta sp. 



Genus Perezella Cepede. Ovoid; ventral surface concave, serves 

 for attachment; macronucleus ellipsoid; contractile vacuole ter- 

 minal; longitudinally, uniformly, ciliated. A few species. 



P. pelagica C. (Fig. 264, e). In the coelom of copepods (Ascartia, 

 Clausia, Paracalanus) ; about 48/x long. 



Genus Dogielella Poljansky. Pyriform; longitudinal ciliary rows; 

 contractile vacuole terminal; macronucleus spherical, with a spheri- 

 cal or elliptical micronucleus; in the parenchyma of flatworms or 

 molluscs. 3 species. 



D. sphaerii P. (Fig. 264, /). 40-100m by 25-54/i; in Sphaerium 

 corneum. 



D. minuta P. (Fig. 264, g). 12-28^4 by up to 20ij.; in Stenostomum 

 Icucops (Platyhelminthes). 



D. Virginia (Kepner and Carroll) (Fig. 264, h). 40-50/x long; in the 

 same host animal; Virginia. 



Genus Orchitophrya Cepede. Elongate pyriform; ciliary rows 

 oblique; macronucleus spherical, central. One species. 



0. stellarum C. (Fig. 264, i). In gonads of the echinoderm, Aster- 

 acanthion (Asterias) ruhens; 35-65/i long. 



Genus Kofoidella Cepede. Pyriform; macronucleus broadly oval; 

 contractile vacuole, subterminal. One species. 



K. eleutheriae C. (Fig. 264, j). In gastro vascular cavity of the 

 medusa, Eleutheria dichotoma; 30-80^ 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 Biitschliella Awerinzew. Elongate with pointed anterior 

 end, with non-ciliated retractile anterior cap; cilia in about 10 

 slightly spiral rows; macronucleus band-form; several contractile 

 vacuoles in a longitudinal row. Several species. 



B. opheliae A. (Fig. 264, A;). In Ophelia limacina; 280-360ju by 

 35-50m. 



B. chaetogastri Penard. Elongate lanceolate, slightly flattened; 

 longitudinal rows of long cilia; cytoplasm colorless; macronucleus 

 elongate; micronucleus voluminous, vesicular; without contractile 

 vacuole; 60-1 20)u long; in the oesophagus of Chaetogaster sp. 



Genus Cepedella Poyarkoff. Pyriform with pointed anterior end, 



