Lake Maxinkuckee, Physical and Biological Survey 59 



Navicula, an elongate form, Cymbella cymbiformis, Pediastrum 

 duplex, P. boryanum; red cysts apparently of Peridinium. 



Sample 16. Anodonta grandis footiana, 90 mm. long, sandy 

 bottom of Lake Maxinkuckee near Norris Inlet. Aug. 29, 1908. 

 Mussel gravid. Parasites, A tax, 3, free among gills, Atax embryos 

 scattered through gills. 



Food material scarce, fine golden brown in mass, consisting of 

 Microcystis aeruginosa abundant; Coelosphaerium kuetzingianum 

 abundant, Lyngbya aestuarii, a few filaments; Anuraea cochlearis 

 and another rotifer ; Botryococcus braunii; Sorastrum, Coelastrum, 

 Scenedesmus, Pediastrum duplex, Navicula several, Melosira tabu- 

 lata, Synedra, Epithemia turgida, Cymbella cymbiformis; other 

 small diatoms rather numerous; Cosmarium, a few. 



Sample 17. Anodonta grandis footiana, 93 mm. long. Sandy 

 bottom of Lake Maxinkuckee near Norris Inlet, Aug. 28, 1908. 

 Mussel gravid. Parasites, 1 Atax, free among gills. Intestines al- 

 most empty. Microcystis aeruginosa one of most abundant ele- 

 ments, Lyngbya aestuarii, Coelosphaerium kuetzingianum, Botry- 

 ococcus braunii; Cosmarium, Pediastrum, Cocconeis pediculus, 

 Epithemia turgida; Navicula, (1 actively moving) Gomphonema, 

 Melosira tabulata, Anuraea cochlearis, Chydorus. 



Sample 18. Anodonta grandis footiana, 95 mm. long, Lake 

 Maxinkuckee near Norris Inlet, Aug. 29, 1908. Mussel gravid. 

 Parasites, 6 Atax free among gills, one a minute red species. Many 

 young Atax embryos in inner side of mantle, not in gills. 



Food material golden brown with some green intermixed, very 

 fine. Microcystis aeruginosa, common; Lyngbya aestuarii, a few 

 filaments; Coelosphaerium kuetzingianum; Botryococcus braunii; 

 Pediastrum duplex; Anuraea cochlearis a few ; Epithemia turgida,; 

 Navicula, common ; Cymbella cymbiformis; Cocconeis pediculus, 

 several; Cosmarium; Chydorus. 



Sample 19. Anodonta grandis footiana, Lake Maxinkuckee, 

 near Winfield's. Mussel gravid. Parasites, young Atax in gills; 

 distomids on mantle; (a slug pearl near hinge.) 



Food : Botryococcus braunii; Microcystis aeruginosa; Lyngbya 

 aestuarii, Coelosphaerium kuetzingianum, Pediastrum duplex, 

 Navicula, Cymbella cymbiformis. 



Sample 20. Anodonta grandis footiana, Lost Lake. Young 

 transparent shell, gravid; length 77 mm., height 41 mm., diameter 

 30 mm. ; live weight 1 oz., shell ] oz. Parasites, several Cotylaspis 

 insignis in axil of gills. Food chiefly Microcystis aeruginosa; con- 

 siderable Botryococcus braunii. 



Sample 21. Anodonta grandis footiana, Lost Lake. Parasites, 



