THE EUGLENOIDINA OF OHIO 359 



E- Caudal end more or less truncate; length 



approximately 200/^. . . . 11. E. rubra 



B- Periplast smooth; length 75-100m. . 12. E. haematodes 



B- Chloroleucites in the form of flattened disks which 

 are often much elongated and rarely with an irreg- 

 ular or extremely notched outline. 

 C^ Length less than 5 times the diameter. 



D' Prominent anterior and posterior paramylon 

 granules not present. 

 El Chloroleucites distinctly lobed. 



F' Form elongately oval; length 95- 



100m 13. E. velata 



F- Form spindle shaped; length 85m. 14. E. sociabilis 

 E- Chloroleucites not distinctly lobed. 

 Pi Length exceeding 55m. 



G^ Pellicula with many small 

 granules underneath arranged 



spirally 15. E. granulata 



G' Pellicula without distinct gran- 

 ules underneath. 

 Hi Color green. 



P Chloroleucites round or 

 oval. 



ji Pyrenoids present 

 in chloroleucites; 



length 80-90M. 16. E. polymorpha 

 J- Pyrenoids absent 

 in chloroleucites; 

 length 60-70M. 17. E. proxima 

 I- Chloroleucites slightly 

 constricted at mid- 

 dle, more or less 

 dumb-bell shaped. 18. E. caudata 



H- Color red or yellowish red. 

 P Cysts spherical in 



form. . . 19. E. flava 



I- Cysts flasklike in form 20 E. orientalis 

 F- Length less than 50m. 



G' Form short cylindrical . 21. E. variabilis 



G- Form spindle shaped . 22. E. gracilis 



D^ Prominent anterior and posterior paramy- 

 lon granules nresent; length of individual 

 approximately 60m .... 23. E. torta 

 C- Length more than 6 times the diameter. 



D^ Posterior part of body with an acute tip. 

 El Periplast not covered with prominent 

 punctuations arranged either spirally 



