THE EUGLENOIDINA OF OHIO 421 



L. 25-40/i. D. 16-22^. 



Distribution, cosmopolitan. Standing water and Plankton. 

 Landacre notes the species from Biemiller's Cove, Sandusky, 

 0., in "towings." 



4. A. truncatum Stein (Fig. 13, PI. XXV). 



Oval, broadest anteriorly, rigid; periplast smooth; primary 

 flagellum as long as body; secondary flagellum more than twice 

 as long as body. 



L. 60^. D. 20ix. 



Distribution, Europe. Standing water. 



5. A. pusillum Stokes (Fig. 14, PI. XXV). 



Broadly oval, flattened, convex dorsally, longitudinally striate, 

 concave ventrally ; primary flagellum as long as body; secondary 

 flagellum about 3 times length of body. 



L. IV D.(?). 



Distribution, North America. Pond water. 



The movement of the form is noted by Stokes as a slow oscil- 

 lating one. 



10. Gen. PLOEOTIA Dujardin. 



Form broadly oval, pointed behind ; two flagella, the posterior 

 being much longer than the anterior ; provided with carinae which, 

 beginning at the posterior end, extend toward the anterior end 

 in a more or less spiral manner; nucleus central; movement 

 creeping. 



Habitat, marine. 



Distribution, cosmopolitan. Two species. 



TABLE OF SPECIES. 



Ai Somewhat compressed, posterior end acuminate, length less than 



twice the diameter . . . • • • 1- !*• vitrea 



A- Radial, not compressed, posterior end not acuminate, length 



more than twice the diameter . . . . . 2. P. marina 



1. P. vitrea Duj. (Fig. 1, PI. XXVI). 



Broadly oval with acute tip slightly uncinate and with 8 longi- 

 tudinal carinae; primary flagellum about as long as body; sec- 

 ondary flagellum about 2 times length of body. 



L. 30/7. D. 20,.. 



Distribution, cosmopolitan ( ?) . Salt water. 



