THE OPALINID CILIATE INFUSORIANS. 



213 



No. 4964, 75 mm. long, from Pecos River, Texas; Captain Page, 

 collector; the other from Prescott, Arizona. 



Measv/rements: A, of a Texas specimen,' B, of an Arizona speci- 

 men — 



Measurements. 



Length of body 



Width of body 



Thickness of body 



Diameter of nuclei (mean) . 

 Diameter of endospherule. 

 Cilia line interval: 



Anterior 



Posterior 



The general appearance of these infections is quite different from 

 that of O. ohtrigonoidea or 0. virguloidea infections, and the ani- 



Fig. 183. — Opalina spiralis : a and 5, magnified 117 diameters ; c, a bit of thb 

 BODV magnified 460 diameters. 



mals are not at all like 0. gigantea, which also is found in Bufo 

 comjjactilis from the same general locality. In both my infections 

 most individuals have the posterior, slenderer portion of the body 

 spirally plicated or twisted and this condition suggests the specific 

 name. Of course, this is not a distinctive feature. 



OPALINA CHOROPHILI. new species. 



7 y;7e.— United States National Museum Cat. No. 16569. 



Host. — Ghorophilus triseriatus (Wied), many infections, from 

 North Carolina and northern Ohio. The type infection is from a 

 North Carolina frog collected by H. H. and C. S. Brimley in 

 March, 1909. 



Measurements of a large individual. — Length of body 0.47 mm.; 

 width of body 0.1 mm.; thickness of body 0.03 mm.; diameter of 

 nucleus 0.0035 mm. to 0.006 mm. (mean 0.005 mm.) ; cilia line interval, 

 anterior 0.00106 mm., middle 0.0025 mm., posterior 0.0036 mm. 



