apical plate on the dorsal side not extending to the apex; hypotheca 

 with 5 postcingular and 2 antapical plates; cells 36-40/li in diameter, 

 40-46/x long. 



Tychoplankter. Wis. 



Glenodinium Gymnodinium Penard 1891, p. 54 

 PI. 90, Figs. 10, 11 



Cells broadly oval as seen in the ventral view, dorsiventrally flat- 

 tened as seen vertically; transverse furrow broad, turning spirally 

 to the left; longitudinal furrow extending from the epicone to the 

 apex of the hypocone, the left margin of the longitudinal furrow 

 with a flange which ends in a tooth at the posterior pole; epitheca 

 with l-(2?) apical, 4 intercalary, and 7 precingular plates; hypo- 

 theca with 5 postcingular and 2 antapical plates; chromatophores 

 brownish-green; cells 35/* in diameter, 40/1 long. 



Tychoplankter. Wis. 



Glenodinium Kulczynskii (Wolosz.) Schiller 1935-1937, p. 96 



PI. 90, Figs. 12-14 

 Cells broadly ovoid or nearly round as seen in vential view, 

 flattened in polar view, the dorsal margin broadly convex; epitheca 

 with 1 apical, 3 intercalary, and 6 precingular plates; hypotheca with 

 6 postcingular and 2 antapical plates; longitudinal furrow extend- 

 ing to the apex of the hypocone; cell 30-31. 5/i, in diameter, 35/i, long. 

 Tychoplankter. Wis. 



Glenodinium palustre ( Lemm. ) Schiller 1935-1937, p. 99 

 [Gonyaulax palustris Lemmermann] 

 PL 90, Figs. 15, 16 

 Cells globose with the transverse furrow slightly but clearly 

 spiral; longitudinal furrow extending from the epicone through the 

 hypocone; epitheca with 1 apical plate, 3 intercalary and 6 precin- 

 gular plates; hypotheca with 5 postcingular and 1 antapical plate; 

 cells 25-30/1 in diameter, 27-34/1 long. 



Plankter; in several, mostly soft water, lakes and acid bogs. Wis. 



Glenodinium Penardiforme (Linde.) Schiller 1935-1937, p. 113 



PI. 90, Fig. 21 



Cells small, ovoid, the epicone sharply rounded and slightly api- 

 culate, dorsiventrally flattened; the hypocone broadly rounded and 

 emarginate at the pole; transverse furrow broad; longitudinal fur- 

 row scarcely extending into the epicone, broadening into the 



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