186 



BULLETIlSr 120, UNITED STATES NATIONAL, MUSEUM. 



Host. — Bufo americanus Holbrook, numerous living infections 

 from Ealeigh, North Carolina, April 14, 1912; H. H. and C. S. 

 Brimley, collectors. Bufos of the same species, collected by the 

 author in Oberlin, Ohio, have given Opalinids of this subspecies. 



Measurements: A^^of a large individual; B^^of a smaU individual — 



Measurements. 



Length of body 



Width of body 



Thickness of body: 



Anterior 



Middle 



Posterior 



Diameter of nucleus 



Diameter of endospherule. 

 Cilia line interval: 



Anterior 



Posterior 



0. 005- 



mm. 

 0. 



.0125 



. 006 0. 0065- 



.002 I 



.0016 ! 

 .003 



246 

 ,115 



,022 



,026 



,025 



,0077 



.002 



.0013 

 . 00365 



d 



Fig. 155. — Opalixa obtrigoxoidea Americana, from Bufo americanus : a, a group of 



ANIMALS FROM ONE HOST, X 117 DIAMETERS ; t, AN INDIVIDUAL WITH ALL ITS NUCLEI 

 DRAWN, X 117 DIAMETERS ; C, A BIT OF THE BODY, X 460 DIAMETERS ; A, A NUCLEUS, 

 X 2,000 DIAMETERS. 



