271 



Cosmarmm, Pediastriini, Cocconeis pedicidus, EpitJiemia turgida; Navi- 

 cula (1 actively moving), GovipJionema, Melosira tabulata, Annraea 

 cochlearis, Chydorus. 



Sample No. 18. Anodonta grandis footiana, 95 mm. long. Lake 

 Maxinkuckee near Norris Inlet, August 29, 1908. Mussel gravid. Para- 

 sites: 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 sestuarii, a few filaments; 

 Coelosphaei'iuDi keutzingianum; Botryococcus braunii; Pediastruni du- 

 plex; Anurxa cochlearis a few; EpitJiemia turgida; Navicxda, common; 

 Cocconema cymbiforme; Cocconeis pedicidus, several; Cosmarium; Chy- 

 dorus. 



Sample No. 19. Anodonta grandis footiana, Lake Maxinkuckee, 

 near Winfield's. Mussel gravid. Parasites: Young Atax in gills; Dis- 

 tomids on mantle (a slug pearl near hinge.) 



Food: Botryococcus braunii; Microcystis aeruginosa; Lyngbya ses- 

 tuarii, Coelosphxrium kuetzingianum, Pediastruni duplex, Navicida, 

 Cocconema cymbiforme. 



Sample No. 20. Anodonta grandis footiana. Lost Lake. Young 

 transparent shell, gravid, length 77 mm., height 41 mm., diameter 30 mm., 

 live weight 1 oz., shell 1-4 oz. Parasites, several Cotylaspis insignis in 

 axil of gills, food chiefly Microcystis seruginosa; considerable Botryococ- 

 cus braunii. 



Sample No. 21. Arwdonta grandis footiana, Lost Lake. Parasites: 

 1 young Atax in gill; Cotylaspis insignis in axil of gill. Food chiefly 

 Microcystis aeruginosa, a little Botryococcus braurdi, Lyngbya sestu- 

 arii and Pediastrum boryanum. 



6. Strophitiis edentulus (Say). Squawfoot. 



Not very common in the lake. Occasional shells can be picked up 

 along shore, especially between Long Point and Arlington, and along 

 the north shore. Living examples were also taken in small numbers from 

 the mussel bed at the mouth of Norris Inlet, and at Long Point. In a 

 collection of about 300 living mussels collected at the latter place in the 

 autumn of 1907, only three were of this species. 



As found in the various rivers of the country, this is one of the 



