THE OPALINID CILIATE INFUSORIANS. 



157 



mens \vere kept prior to preservation, but the form of the mitotic 

 nucleus is constant. Similar differences between species in the shape 

 of the dividing nuclei have been observed in numerous instances ana 

 the character is found to be of diagnostic value. 

 It hardly seems justifiable, however, on the 

 basis of this character alone, to recognize the 

 Javan forms as belonging to a distinct species. 

 They are therefore placed as a subspecies of 

 Cepedea fulchra. 



CEPEDEA OCCIDENTALIS, new species (fig. 124). 



Type. — United States National Museum Cat. 

 No. 16505. 



Host. — Rana chrysoprasina (Cope), one in- 

 fection, in United States National Museum, 

 specimen No. 14180, 23 mm. long, from Nica- 

 ragua, August 7, 1885 ; J. F. Bransford, collector. 



Measurements of an ordinary individual. — 

 Length of body 0.15 mm. ; width of body 0.083 

 mm. ; thickness of body 0.038 mm. ; diameter of 

 resting nucleus 0.004 mm. to 0.0045 mm. ; diameter of endospherule 

 0.00175 mm. 



This is another considerably flattened form, rather similar to C. 

 puTchra. Its nuclei are even larger than those in C, pulchra japonica. 



Fig. 122. — Cepedea 

 pdlchra japonica, 

 x 460 diameters. 



a b 



PiQ. 123. CBPEDBA PULCIIBA JAVBNSIS, X 460 DIAMDTERS. 



Its endospherules are nearly twice as large as those of the latter va- 

 riety. Cepedea pulchra and its subspecies and G. occidentalis seem 

 to show a condition intermediate between that of the Cepedeas of the 

 dimidiata group and that of the Opalinas. 



