I 



THE OPALIXII) CILIATE IX^FUSORIAXS. 



193 



Measureiwents: A, of a large, slender individual; B, of a smaller^ 

 hroader form, hoth from Maryland — 



Some of the individuals in these infections are ohtr'igooiaidea-Wke 

 in form, others are short and broad, approaching 0. ranarum in 

 shape. It is noteworthy that the endospherules in the Mary hind 

 infection are of diverse sizes, some minute, some very large. I do 

 not understand this condition. 



OPAUNA OBTRIGONOIDEA AUSTRICOLA, new subspecies. 



r?//7e.— United States National Museum Cat. No. 16590. 



Host. — Rana pipiens austricola (Cope), four infections, one from 

 Porto Rico, one from Guatemala, and two from Tobasco, Mexico. 

 Of the latter the type infection is from United States National 

 Museum specimen No. 6506 (fig. 163, Z>), 38mm. long, collected 

 March, 1864, by Doctor Berendt " in a well." 



Measurements: A, of a large hroad individual, an anterior daughter 

 cell just come from transverse division {like the upper right figure 

 in figure 163, h) ; B. of a long, nai^'ower individual — 



Measurements. 



Length of body 



Width of body 



Thickness of body... 

 Diameter of nucleus 



Most are 



Cilia line interval: 



Anterior 



Posterior 



0.188 

 .12 

 .045 



. 0032-. 004 

 .004 



.0023 

 .005 



0.23 

 .09 



In another individual host of the same species, collected at the 

 same time and place, are some much larger examples of this Opalina 

 (fig. 163, a). A specimen has been deposited in the United States 

 National Museum as No. 16592. 



