100 



BULLETIN 120, UNITED STATES NATIONAL MUSEUM. 



a male with huge fat bodies, from Chicara, Venezuela, " Brooklyn 

 Institute." 



Measurements of an ordinary individual. — Length of body 0.27 

 mm. ; width of body 0.13 mm. ; length of nucleus O.0325 mm. ; width 

 of nucleus 0.0228 mm.; diameter of endospherule 0.0023 mm.; cilia 

 line interval, anterior 0.00216 mm., posterior 0.00425 mm. 



Fig. 67.- 



-ZEiXKaiEiiLA magna: a is magnified 460 diameters; h is magms'Ied 249 



DIAMETERS. 



This very thin species is the largest known Zelleriella except Z. 

 opistliocarya (to be described). It is seen in my material in two con- 

 ditions, wedge-shaped individuals, as in figure 67, a, and ridged, 

 crenate, slightly twisted individuals (fig. 67, &), such as are so 

 often found in life in many species of flattened Opalinids and in 

 some cylindrical species as well. Probably prompt action of the 

 killing fluid has in this material preserved the crinkled form 

 of the animals. The nuclei in the many individuals observed are 



