106 BULLETIN 120, UNITED STATES NATIONAL MUSEUM. 



ZELLERIELLA RANAXENA, new species. 



Type.— United States National Museum Cat. No. 16476. 



Host. — Rana draytonii Baird and Girard, from California, April, 

 1913. Purchased frogs, collector and exact locality unknown. 



Measurements of an ordinary individual. — Length of body, 0.1674 

 mm. (of a large individual 0.187 mm.) ; width of body, 0.091 mm.; 

 diameter of nucleus, 0.0174 mm.; cilia line interval, anterior 0.003 

 mm., posterior 0.0045 mm. 



Fig. 72. — Zelleriella raxaxexa^ X 460 diameters. 



The characteristic form of this rather large and very thin Zelleri- 

 ella is shown in figure 72, h. Its shape is rather similar to that of Z. 

 patagoniensis, except that the posterior end of the body, when pointed 

 at all, is always rounded, never sharp. It seems clearly a distinct 

 form. No nuclei in mitosis were observed. 



ZELLERIELLA DARWINII, new species (figs. 73 and 74). 



Type. — United States National Museum Cat. No. 16477. 



Host. — Bhinoderma darwinii Dumeril and Bibron, one infection 

 in United States National Museum specimen No. 38931, 32 mm. long, 

 from Concepcion, Chile; T. Barbour, collector. 



