212 BULLETIN 120, UNITED STATES NATIONAL MUSEUM. 



a 



Fig. 182. — Opalina tkiangulata, x 460 diameters : b shows the nuclei and a por- 

 tion OF THE LINES OF INSERTION OF THE CILIA. 



OPAUNA SPIRALIS, new species. 



Type.—Vnii^di States National Museum Cat. No. 16616. 

 Host. — Bufo compactilis Wiegmann, two abundant infections ; one, 

 the type infection, from United States National Museum specimen 



