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, Atax, 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, 



