206 



BUIXETIN 120, UNITED STATES NATIONAL, MUSEUM. 



fornia forms from the others, though I confess to a feeling that they 

 are not the same. Fuller series of infections from both hosts are 

 needed to warrant any definite expression of opinion. 



Opalina virguloidea, United States National Museum No. 16559. 



Host. — Rana sylvatica LeConte, numerous living infections, from 

 Oberlin, Ohio, and Raleigh, North Carolina. The type infection 

 was collected at Oberlin April 28, 1915, by M. M. Metcalf. 



Fig. 175. — Opalina virguloidea, fro.m Rana silvatica, X 117 diameters. The small 



CIRCDLAR DRAWING REPRESENTS A CYST. 



Measurements of an average individual. — ^Length of body, 0.273 

 mm. ; width of body, 0.1 mm. ; thickness of body, anterior 0.018 mm., 

 middle 0.023 mm., posterior 0.024 mm.; diameter of nucleus, 0.005 

 mm. to 0.006 mm.; diameter of endospherule, 0.0015 mm. to 0.0018 

 mm.; cilia line interval, anterior 0.0019 mm., posterior 0.0041 mm. 



OPALINA VIRGULOIDEA MAGNINUCLEATA, new subspecies. 



Type. — United States National Museum No. 16549. 



Host. — Adds grylhis (LeConte), numerous living infections, from 

 North Carolina, H. H. and C, S. Brimley, collectors. 



Measurements: A., of an average individual; B., of a large in- 

 dividual — 



