THE OPALIXID CILIATE INFUSORIANS. 



237 



The. individuals in these infections are quite diverse in shape. 

 Some are very broad, like O. ranafum form lata (fi|;. 211, c) ; others 

 are triangular, being narrow behind, like 0. ranm-um form parvipal- 

 inatar (fig. 211. h) ; others are narrow and parallel-sided, like O. 

 ranarum form tmincata (fig. 211. 

 d). A good many resemlde the 

 narrow individuals of O. japon- 

 Ica. and, like them, have an abrupt 

 l)osteiior point (fig. 211, a). Their 

 spherical nuclei, however, are quite 

 different from the smaller and 

 mostly ellipsoid nuclei of the latter 

 species. Their nearest relatives 

 may well be the Asiatic species 

 O. japoniea and O. coracoidca and 

 the western North American O. draytonii. They seem to be western 

 lepresentatives of the Opalinae latne^ doubtless immigrants. 



OPALINA CAMERUNENSIS. new species. 



I'ype. — United States National Museum Cat. No. 1(5GU1. 



Host. — Ilylanibates rufus (Reichenow), one very abundant infec- 

 tion, from United States National Museum specimen No. 48850, 75 

 mm. long, from the Cameroons, west Africa, Barbour collector (?). 



Fig. 211. — Opalina panamensis, 

 diameters. 



117 



Fig. 212. — Opalina cAMEnrNESSis, X 11T niAMETKRS. 



Mca-mreinents of a large^ bread individual. — Length of body 0.342 

 mm. : width of body 0.27 mm'. ; thickness of body, anterior 0.021 mm., 



