WISCONSIN PHYTOPLANKTON 147 



Zygospores spherical to ellipsoidal and with broadly rounded poles, 

 zygospore wall smooth (Ralfs). 



Cells 26-35 ft long ; breadth at base of semicells 15-22 [i, at apex 

 of semicells 1(>-15 /i ; breadth at isthmus 13-19 /x. 



Bettine (rrr), Blue Gill (rr), Carson (rr), Crooked (r), Howey (rr), Jag 

 (rrr), Jones (rrr), Little Doctor (sss), Lynx (rrr), Eed Bass (rr), Big St. Ger- 

 main (r), "WMtney (r). 



