380 OHIO BIOLOGICAL SURVEY 



nally striate ; flagellum longer than body ; paramylon in the form 

 of 2 large granules, one on each side. 

 Reproduction (?). 



L. 19;U. D. lojJ.. 



Distribution, Europe. 



*3. P. orbicularis Hubner (Fig. 8, PI. XVI). 



Spherical with short uncinate posterior spike ; periplast longi- 

 tudinally striate ; flagellum as long as body ; paramylon in the form 

 of one large annular granule. 



Reproduction (?) . 



L. 70/^. D. 45/x. 



Distribution, Europe and North America in standing water. 



Ohio, Hiawatha Lake, Mt. Vernon. 



*4. P. pleuronectes (Mull.). (Fig. 9, PI. XVI). 



Broadly oval, slightly twisted with short uncinate posterior 

 spike, and median fold reaching posteriorly to middle of cell ; peri- 

 plast longitudinally striate ; flagellum as long as or slightly longer 

 than the body; paramylon, 1-2 annular granules. 



Reproduction ( ?). 



L. 45-49^. D. 33-35/x. 



Distribution, cosmopolitan, in standing water and Plankton. 



Sandusky, Basket Factory Cove (Landacre) ; Magnetic 

 Springs (Baker's Creek, 0.) ; coll. Osborn. 



*5. P. triqueter (Ehrenb.), (Fig. 10, PI. XVI). 



Oval, decidedly concave-convex, posterior spike short and unci- 

 nate ; dorsal fold prominent, reaching from anterior to posterior 

 end; periplast longitudinally striate; flagellum as long as body; 

 paramylon 1-2 annular granules. 



Reproduction ( ?). 



L. 49-55/j. D. 33-35,a. 



Distribution, cosmopolitan. In standing water. 



The species is common and easily identified by the longitudinal 

 carina or fold reaching to the posterior end, although closely allied 

 to P. pleuro7iectes and placed as a variety of that species by some 

 investio-ators. It was found in East Swamp, S. Bass Island, and 

 East Harbor, Lake Erie, by Jennings, and in Sandusky Bay by 

 Landacre. 



Gambler, Mt. Vernon, 0. (Hiawatha Lake). 



