Lake Maxinkuckee, Physical and Biological Survey 53 



Sample 6. August 20, 1908. A small amount of flocculent 

 grayish material. 



Peridinium tabulatum, abundant, agglutinated in masses; Mic- 

 rocystis aeruginosa, very common ; Navicula, Staurastrum, Cos- 

 marium, several; Chydorus, fragment; Scenedesmus, small forms, 

 common; Pediastrum boryanum, Cymbella cymbiformis, Tetraed- 

 ron, common ; various diatoms ; Rotifer, an elongate species ; 

 Merismopedia glauca; Coelastrum, desmids. 



Sample 7. August 21, 1908. A small amount of rather co- 

 herent fine flocculent greenish material. 



Peridinium tabulatum, very common ; Anuraea cochlearis, a 

 few; Microcystis aeruginosa, frequent; Lyngbya aestuarii, short 

 filament; Pediastrum boryanum, diatoms (Cymbella cymbi- 

 formis; Cymatopleura; Epithemia argus, Gomphonema, Synedra) 

 Tetraedron, Scenedesmus, occasional ; Dinobryon, Staurastrum, 

 rather slender form. 



Sample 8. August 20, 1908. A small amount of flocculent 

 bluish-gray material. 



Peridinium tabulatum, most abundant; Coelosphaerium kuetz- 

 ingianum; Pediastrum duplex; Microcystis aeruginosa, Anuraea 

 cochlearis, sponge spicule, diatoms {Navicula, Cymbella, etc.). 

 Scenedesmus. 



Sample 9. August 20, 1908 ; a fair amount of flocculent gray- 

 ish-brown material with a greenish cast. 



Peridinium tabulatum, most abundant; Microcystis aeruginosa, 

 Anuraea cochlearis, Staurastrum, Pediastrum duplex, Botryococ- 

 cus braunii; Tetraedron minimum, Coelosphaerium kuetzing- 

 ianum; Pediastrumi boryanum, Chydorus, Lyngbya aestuarii, 

 Gloeocapsa, diatoms — Cymbella cymbiformis, Navicula. 



3. SPIKE 



UNIO GIBBOSUS Barnes 



This mussel, known among clammers as the "spike" or "lady- 

 finger" is, next to Lampsilis luteola, the most abundant shell in 

 the lake. It is found wherever the other mussels are; that is, in 

 sandy or somewhat marly bottom in rather shallow water most of 

 the way around the lake, and in the shell-bed in Lost Lake below 

 Bardsley's. In Lake Maxinkuckee one of the best beds is at Long 

 Point. It is abundant also at Norris Inlet, and by McDonald's 

 and Farrar's. 



No very young of this species were found in the lake; they are, 

 however, hard to find in numbers anywhere, even in rivers where 



