180 BULLETIN 120, UNITED STATES NATIONAL MUSEUM. 



single infection, and by the small size of its nuclei. Note also the 

 small endospherules in the list of measurements. 



Opalina ohtrigoTioidea, United States National Museum No. 16581. 

 Host. — Scaphiopus solitarius Holbrook, numerous living infec- 

 tions from Raleigh, North Carolina, September, 1908; H. H. and 

 C. S. Brimley, collectors. 



Measurements of an ordinary iiidividual. — Length of body 0.353 

 mm. ; width of body 0.102 mm. ; thickness of body, anterior, 0.0072 



mm., middle 0.011 mm., posterior 

 0.01 mm. ; diameter of nucleus 

 0.005 mm. ; cilia line interval, an- 

 terior 0.00125 mm., middle 0.003 

 mm., posterior 0.003 mm. 



riG. 145. — Opalina obtrigonoidea, from 



BUFO PUNCTATDS, X 117 DIAMETERS. 



Opalina ohtrigonoidea, United 

 States National Museum specimen 

 No. 16541. 



Host. — Bufo punctatus Baird and Girard, one abundant in- 

 fection, in United States National Museum specimen No. 26159, 

 41 mm, long, from Guanajuato, Mexico; A. Duges, collector. 



M easurements of a large 

 individual. — Length of 

 body 0.427 mm. ; width of 

 body 0.128 mm. ; thickness 

 of body 0.03 mm.; diam- 

 eter of nucleus 0.0035 mm. 

 to 0.0045 mm.; cilia line 

 interval, anterior 0.0025 

 mm., middle 0.004 mm., 

 posterior 0.0045 mm. 



Opalina ohtrigonoidea., 

 United States National 

 Museum No. 16542. 



Host. — Hyla fe^noralis 

 Daudin, four infections 

 from Georgia. The speci- 

 men deposited in the United States National Museum is from United 

 States National Museum specimen No. 5908, 32 mm. long, from Eice- 

 boro, "May or June"; LeConte, collector. 



Fig. 



146. — Opalina obtrigonoidea, from Hyla fe- 



MORALIS, X 117 diameters. 



