144 BULLETIN 120, UNITED STATES NATIONAL MUSEUM. 



The smaller individuals of this Hawaiian Gepedea are shaped as 

 are ordinary C. dimidiata. Many of the larger individuals, on the 

 other hand, are spirally ridged, presenting a veiy characteristic ap- 

 pearance (fig. 108, 6). Intermediate forms show a condition much 

 like the larger forms of G. dimidiata orientalis. The nuclei are 

 ellipsoid and quite large. The cilia are short as in other dimidiata 

 forms. 



Fig. 108. — Cepbdea dimidiata hawaiiensis, x 460 diameters. 

 CEPEDEA SAHARANA, new species. 



Type. — United States National Museum Cat. No. 16620. 



Host. — Rana esculenta ridibunda (Pallas), three abundant in- 

 fections and one scant infection from Biskra, Algeria, collected May 

 26, 1912. by D. D, Streeter, jr. The type infection is from United 

 States National Museum specimen No. 49840. 



Measurements of a large^ Paramecium-shaped individual. — Length 

 of body 0.245 mm.; width of body 0.057 mm.; diameters of nuclei 

 from 0.0027 mm. to 0.003 mm. 



Measurements of a small^ more stocky individual. — Length of body 

 0.104 mm. ; width of body 0.048 mm. ; diameters of nuclei the same 

 as in the more slender individuals. 



