Protozoa mid Iiotifcra nt Hardini, III. 331 



long cilia. A circle of cilia surrounds the large terminal 

 mouth opening. 



56. C. hirtus Ehrbg. 



This lively and interesting little species was taken mostly 

 from June to September in both years, with scattering oc- 

 currences in May, October, and December. It was not very 

 common, although widely distributed. 



Subfamily CYCIiODlNlN^. 



DiDiNiUM Stein. 



Obovate or obconic, anterior end feebly convex to distinctly 

 concave, the mouth borne on a prominent conical elevation ; 

 cilia tion reduced to an anterior and a median circle, the 

 latter sometimes wanting. 



57. D. nasutura 0. F. Mull. 



One or two examples of this very peculiar protozoan were 

 found in the aquaria started A\ith dried mud from Phelps 

 Lake. It is a line species of striking form and very quick 

 movements. 



Family TRACHELIID^. 



Subfamily Amphileptinje. 



Amphileptus Ehrbg. (Swan Animalcules.) 



Elastic, ovate, anterior part more or less flattened and 

 produced like an elephant's trunk, along the lower edge of 

 which (oblique in side view) extends the slit-shaped mouth ; 

 surface entirely and finely ciliate ; contractile vacuoles single 

 or multiple. 



58. A. anser Ehrbg. 



Found in August in a Birge-net collection from among 

 plants at the mouth of Dogfish Lake. 



DiLEPTUS Duj. 



Elongate, with a very long, slender flexible snout, along the 

 ventral edge of wluch is a band of trichocysts, ending at the 



