269 



degree by a distomid which formed cysts in the margin of the mantle. 



Food and Parasites of Various Examples. — The following is the 

 result of the examination of various examples of Anodontas: Sample 

 No. 10. Vial containing intestinal contents of Anodonta grandis foot- 

 iana, Lost Lake, September 7, 1908. The vial contains a considerable 

 amount of material (in formalin) which was separated into black fine 

 mud below and fine flocculent light green above. Upper portion-- 

 Microcystis xruginosa, most common; Peridinium tabulatiim, some; 

 Pediastrum horyanum; Melosira crenidata, a few filaments; Coelastrum 

 microporum, Botryococcus hraunii and Scenedesmus. Bottom layer — 

 Lyngbya mstuarii, Microsystis xruginosa, very common; Peridinium 

 tahulatum, Anurxa cochlearis, Cocconema cymbiforme and Navicula. 



Sample No. 11. Food of Anodonta grandis footiana, Lake Maxin- 

 kuckee, near Norris Inlet, August 20, 1908. A good mass of flocculent 

 fine green material; no mud. 



Microcystis xruginosa, most common, Melosira, filament, Oscillatoria, 

 short filament; Anuraea cochlearis, several; Cocconema cymbiforme; 

 Gomphosphxria aponina; Peridinium tabulatum; Coelosphxriu^n keut- 

 zingianum, Lyngbya xstuarii, Epithemia argus, Chydorus, and what 

 appears to be fragments of Ceratium hirundinella. 



Sample No. 12. Anodonta grandis footiana, near Norris Inlet, Lake 

 Maxinkuckee, August 20, 1908; a small mass of flocculent blue material. 



Microcystis xruginosa most abundant; Lyngbya xstuarii, Melosira, 

 Epithemia, Anurxa cochlearis, Pediastrum boryanum, Cosmarium inter- 

 medium and a few others, Staurastrum sp?, Spirulina and Pediastrum 

 duplex. 



Sample No. 13. Anodonta grandis footiana, 97 mm. long. Edge 

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



Parasites; 9 Atax, free among gills. Mussel gravid, with anterior 

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

 mass fine golden brown, abundant in quantity, containing Anurxa 

 cochlearis, many; Microcystis xruginosa, most abundant element; Ling- 

 bya xstuarii, frequent; Scenedesmus, a few; Botryococcus braunii, fre- 

 quent; Cocconema cymbiforme; Staurastrum, Navicula; Fragilaria; 

 Chydorus, a few; Coelosphxrium kuetzingianum; the diatoms are not 

 abundant. 



Sample No. 14. Anodonta grandis footiana apparently old, 90 mm. 



