THE OPALINID CILIATE INFUSOEIANS. 

 PROTOOPALINA NUTTI, new species. 



45 



T7/pe.—Vmted States National Museum Cat. No. 16621. 



Host. — Ba7ia nutti Boulenger, United States National Museum No. 

 41438, from British East Africa, collected October, 1906, by the 

 Smithsonian African Expedition on " the Mount Kenia trip." Of 

 nine frogs collected at the same time and place eight were infected 

 with this Protoopalina. 



Fig. T1. — PuoTooPALiNA NUTTI : a, h, c, and d, slender individuals; e, a broader form: 

 b, magnified 1,000 diameters^ the other figures 460 diameters. 



Measurements of an ordinary individual. — Length of body 0.126 

 mm.; width of body 0.0258 mm.; length of nucleus 0.013 mm.; 

 width of nucleus 0.0085 mm.; length of cilia at least 0.015 mm. 

 (The cilia are seldom well enough preserved for one to be sure he is 

 measuring their full length.) 



This species is elongated. Usually the posterior end of the body 

 tapers evenly to a long point (fig. 22, c and d) , giving much the shape 

 of a macrogamete mother cell. Other individuals narrow more 



