692 



PROTOZOOLOGY 



layer of refringent materials; endoplasm sparse; macronucleus bas- 

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

 vacuoles. One species. 



M . sagittae I. (Fig. 296, d). About 250/z by 130/x; in the body cavity 

 of Sagitta sp. 



Genus Perezella Cepede. Ovoid; ventral surface concave, serves 

 for attachment; macronucleus ellipsoid; contractile vacuole ter- 



^■^■h 



JH 



Fig. 296. a, Anoplophrya rnarylandensis, X500 (Conklin); b, A. 

 orchestii, X500 (Summers and Kidder); c, Rhizocaryum concavum, X670 

 (C6pede); d, Metaphrya sagittae, X120 (Ikeda); e, Perezella pelagica, 

 X340 (Cepede); f, Dogielella sphaerii, X470 (Poljansky); g, D. minuta, 

 X670 (Poljansky); h, D. Virginia, X670 (Kepner and Carroll); i, Orchi- 

 lophrya stellarum, X870; j, Kofoidella eleutheriae, X270; k, Biitschliella 

 opheliae, X350 (Cepede). 



