Protozoa and Eotifera at Havana, III. 313 



pelagic were those that evidently preferred clear open water, 

 free from vegetation. 



Thirty-five of the species here treated were found in open 

 water, either in surface, hottom, or oblique towings. They 

 are as follows : 



Arcella vulgaris Ehrbg. Euglena acus Ehrbg. 



Arcella vulgaris discoides. Euglena oxyuris Schmarda. 



Leidy. Euglena torta Stokes. 



Arcella vulgaris angulosa Trachelomonas acuminata 



Leidy. Schmarda. 



Arcella dentata Ehrbg. Phacus longicauda Ehrbg. 



Difflugia globulosa Duj. Phacus pyrum Ehrbg. 



Difflugia pyriformis Perty. Volvox globator Ehrbg. 



Difflugia acuminata Ehrbg. Pleodorina californica Shaw. 



Difflugia lobostoma Leidy. Cryptomonas ovata Ehrbg. 



Difflugia corona Wallich. Peridinium tabulatum Ehrbg. 



Difflugia aculeata Ehrbg. Ceratium brevicorne Hempel. 



Difflugia tuberculosa Paramecium aurelia 0. F. 



Hempel. Mull. 



Difflugia fragosa n. sp. Stentor polymorphus 0. F, 

 Actinophrys sol Ehrbg. Mull. 



Actinosphaerium eichhornii Stentor coeruleus Ehrbg. 



Ehrbg. Stentor barretti Barrett. 



Kaphidiophrys pallida Halteria grandinella 0. F. 



Sclmlze. Mull. 



Dinobryonsertularia Ehrbg. Codonella cratera Leidy. 



Euglena viridis Ehrbg. Tintinnopsis illinoisensis 

 Euglena spirogyra Ehrbg. Hempel. 



To these might be added Diditiium nasutum 0. F. Mull., 

 mentioned by Zacharias ('94a), and Trachelomonas <-<tu<lata 

 Ehrbg, both of which were found in aquaria started with mud 

 from the bottom of Phelps Lake. 



One peculiar fact noted was the occurrence of a number of 

 Rhizopoda in the surface towings. Prof. Frank Smith ('94) 

 lists three species as occurring in surface collections in Lake 

 St. Clair; Dr. C. A. Kofoid lists eight species from the waters 



