234 BULLETIN 120, UNITED STATES NATIONAL MUSEUM. 



Measurements of an ordinary individual. — Length of body 0.2 

 mm.; width of body, 0.094 mm-; length and width of nuclei, first 

 0.0045 mm. by 0.003 mm., second 0.0052 by 0.003 mm., third 0.006 mm. 

 by 0.0035 mm.; diameter of endospherule 0.0015 mm.; cilia line in- 

 terval, anterior 0.0022 mm., posterior 0.0032 mm. 



This material is not well preserved, the shape of most individuals 

 being distorted. The general appearance, the measurements, andr 

 especially the ellipsoidal nuclei suggest possible identity with O'palina 

 japonica. 



OPALINA NATALENSIS, new species. 



Type. — United States National Museum Cat. No. 16588. 



Host. — Phrynohatrachus natalensis (Smith), three infections, 

 from Bahr-el-Gebel, Sudan, Africa, March, 1905; F. Werner col- 

 lector. The type infection is from United States National Museum 

 specimen No. 39477, 20 mm. long. 



Fig. 208. — Opalina natalensis, X 117 diameters. 



Measurements of an ordinary individual. — Length of body 0.3 mm. ; 

 width of body 0.15 mm.; thickness of body 0.04 mm.; diameter of 

 nucleus 0.006 mm. to 0.007 mm. ; diameter of endospherule 0.002 mm.; 

 cilia line interval, anterior 0.0015 mm., posterior 0.0025 mm. 



In form this Opalina somewhat resembles O. japonica, but its 

 nuclei are larger and are spherical and the animals are in no instance 

 sharp pointed posteriorly. Some of the individuals approach the 

 Opalinae angustae in form. 



OPALINA CORAOmEA Bezzenberger (1904). 



Hosts. — Rana cyanophlyctis Schneider. I have had no material 

 of this species. Bezzenberger reports it from "Asia." 



M easurements. —L^rxgih of body 0.204 mm.; width of body 0.12 

 mm. ; diameter of nucleus 0.0035 mm. 



