58 Lake Maxinkuckee, Physical and Biological Survey 



Microcystis aeruginosa most common, Melosira filament, Oscil- 

 latoria, short filament ; Anuraea cochlearis several ; Cymbella 

 cymbiformis ; Gomphosphaeria aponina; Peridinium tabulatum; 

 Coelosphaerium kuetzingianum, Lyngbya aestuarii, Epithemia 

 argus, Chydorus, and what appears to be fragments of Ceratium 

 hirundinella. 



Sample 12. Anodonta grandis footiana, near Norris Inlet, 

 Lake Maxinkuckee, Aug. 20, 1908 ; a small mass of flocculent blue 

 material. 



Microcystis aeruginosa most abundant; Lyngbya aestuarii, 

 Melosira, Epithemia, Anuraea cochlearis, Pediastrum boryanum, 

 Cosmarium intermedium and a few others, Staurastrum, Spirulina 

 and Pediastrum duplex. 



Sample 13. Anodonta grandis footiana, 97 mm. long. Edge 

 of Lake Maxinkuckee east of Norris Inlet, Aug. 29, 1908. 



Parasites, 9 Atax, free among gills. Mussels gravid, with ante- 

 rior end of shell indented and with some brown spots on the nacre. 

 Food mass fine golden brown, abundant in quantity, containing 

 Anuraea cochlearis many; Microcystis aeruginosa most abundant 

 element; Lyngbya aestuarii frequent; Scenedesnms, a few; Botry- 

 ococcus braunii frequent, Cymbella cymbiformis; Staurastrum, 

 Navicula; Fragilaria; Chydorus, a few; Coelosphaerium kuetz- 

 ingianum; the diatoms are not abundant. 



Sample 14. Anodonta grandis footiana apparently old, 90 mm. 

 long, near Norris Inlet, Lake Maxinkuckee, Ind., Aug. 29, 1908, 

 the shell stained somewhat brown inside, with one steel-blue stain 

 on the right valve anteriorly. 



Parasites ; Atax 7, large, full of eggs, one small, one very small, 

 these all free among the gills; Cotylaspis insignis 1, in axil of gill. 



Food abundant; Microcystis aeruginosa abundant, Lyngbya 

 aestuarii common, Pediastrum duplex, Botryococcus braunii, a few ; 

 Cosmarium; Anuraea cochlearis several; Scenedesmus; Ankistro- 

 desmus, and many diatoms, among which are Cocconeis pediculus, 

 Melosira, Gomphonema, Navicula, Epithemia turgida, etc. 



Sample 15. Anodonta grandis footiana, 101 mm. long, Lake 

 Maxinkuckee, near shore, by Norris Inlet, Aug. 29, 1908. 



Parasites, 5 Atax, free in gills, some full of eggs, 2 smaller in 

 size, larval Atax (black) scattered in gills. Cotylaspis insignis 2, 

 axil of inner gill. 



A large amount of food material in intestines, very fine, of a 

 yellowish-brown color. 



Microcystis aeruginosa, Anuraea cochlearis, Lyngbya aestuarii, 

 Botryococcus braunii, Coelosphaerium kuetzingianum, Cosmarium, 



