THE OPALINID CILIATE INFUSORIANS. 



215 



States National Mu- 

 seum are from 

 United States Na- 

 tional Museum frog 

 No. 15566, 35 mm. 

 long, from Cook 

 County, Texas ; 

 G. H. Roysdale col- 

 lector. 



Measurements of 

 a good-sized indi- 

 vidual. — Length of 

 body 0.41 mm.; 

 width of body 0.1 

 mm.; thickness of 

 body 0.031 mm.; di- 

 ameter of nucleus 0.004 mm. to 0.0065 mm., mean 0.005 mm. ; diameter 

 of endospherule 0.002 mm. to 0.00225 mm. ; cilia line interval, an- 

 terior 0.00207 mm., middle 0.00305 mm., posterior 0.00385 mm. 



Fig. 186. — Opalina chokophili, from Chorophilus or- 

 xatus, x 117 diameters. 



Fig. 187. — Opalina chorophili, from chorophilus feriarum : a axd h samples from 

 TWO infections, showing diversity in size and form, X 117 diameters. (One 



MINUTE ANIMAL IN h SHOWS ITS NUCLEI) ; C, A CVST X 1,000 DIAMETERS. 



