t)r. C. A. Rofolil on Pleoloriiia illiiiois'iinis. 155 



I'leodoriud illinoinensis, sp. n. 



Number of cells in colony usually /i2, rarely IG or 65. 

 Dinieiisious of colony range tVoni 40 x .S8 /a to 200 x 17o /*. 

 Vegetative cells always 4 in number. Gonidial cells a|)|)roxi- 

 mately 1 . I — 2 times diameter of vegetative cells. Known 

 habitat : submerged lands along the Illinois River. Types 

 deposited in collections of Illinois State Laboratory of Natural 

 History and United States National Museum. 



Illinois Biological Statiou, 

 July -Jo, 1898. 



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