142 A CATALOG OF ILLINOIS ALGAE 



months). Galtsoff, loc. cit.: Mercer — Mississippi River (Aug.). 

 Eddy 1931B, p. 462: Pulaski, Wetaug — sink-hole ponds (Apr., 

 July, Sept.). Galtsoff, loc. cit.: Rock Island, Whiteside- — Missis- 

 sippi River (July, Aug.). 



S. HEXACERUM (Ehr.) Wittr. West & West, loc. cit., p. 138. pi. 142. f. 



11-14 (1923). 



Transeau: Clark, Casey — pond (May). Coles, Ashmore- — pond 

 (Nov.). 



S. MARGARITACEUM (Ehr.) Menegh. West & West, loc. cit., p. 131. pi. 



150. f. 5-9 (1923). 



Transeau: Coles, Ashmore — pond (Nov.). 



S. OXYACANTHUM Arch. West & West, loc. cit., p. 169, pi. 143. f. 18, 19 



(1923). 



Transeau: Coles, Ashmore — pond (Nov.). 



S. POLYMORPHUM Breb. Wcst & West, loc. cit., p. 125. pi. 142, 143. f. 



24, 1-3 (1923). 



Transeau: Clark, Casey — stream (Apr.). 



S. PUNCTULATUM Breb. West & West, Brit. Desmid. 4: 179. pi. 127. 



f. 8-11, 13, 14 (1912). 



Transeau: Clark, Casey — stream (Apr.). Coles, Ashmore — pond 

 (Nov.); Charleston— ditch (May). Johnson & Atwell 1890, p. 20: 

 Cook— "Big Woods" (Apr.). 



Phylum: PYRROPHYTA 

 Class: DINOPHYCEAE 



Subclass: DINOFLAGELLATAE 

 Order: PERI DINI ALES. 



Family: GLENODINIACEAE 



GLENODINIUM Stein, 1883 



G. ciNCTUM Ehr. Schilling in Pascher, Suesswass.-fl. Deutsch. 3: 23. 

 f. 23 (1913). 



Kofoid 1908, pp. 68, 82, 292, 322: Mason, Havana— Illinois 



River (Dec-Sept.). Eddy 1930, p. 282: "plankton . . . from 



ponds in . . . Illinois." 

 G. GYMNODiNiUM Penard. Schiller in Rab., Kryptog.-fl. Deutsch. 

 10 (3): 118. f. 116a-l (1937). 



Eddy 1930, p. 284: Whiteside— Rock River. 

 G. PALUSTRE (Lemm.) Schill. Schiller, loc. cit., p. 99. f. 87a-c (1937). 

 Gonyaulax palustre Lemm. 



Eddy 1930, p. 288, as Gonyaulax palustre: Co. ?- — "plankton from 



shallow lakes of central Illinois." 

 G. QUADRIDENS (Stein) Schill. Schiller, loc. cit., p. 117. f. 115a-m 

 (1937). 



Peridinium cunningtonii (Lemm.) Lemm.; P. quadridens Stein. 



