270 



long, near Norris Inlet, Lake Maxinkuckee, Ind., August 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 seruginosa, abundant; Lyngbya asstu- 

 arii, common; Pediastnim duplex, Botryococcus braunii, a few; Cos- 

 marium; Anursea cochlearis, several; Scenedesmus ; Ankistrodesmus, and 

 many diatoms, among which are Cocconeis pediculus, Melosira, Govipho- 

 nema, Navicula, E pit hernia turgida, etc. 



Sample No. 15. Anodonta grandis footiana, 101 mm. long. Lake 

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



Parasities; 5 Atax, free in gills, some full of eggs, 2 smaller in .«ize, 

 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. 



Microsystis seruginosa, Anursea coclilearis, Lyngbya aestnarii, 

 Botryococcus braunii Coilosphaerium keiitiingianum, Cosmarium, Navi- 

 cula, an elongate form, Cocconema cymbiforme, Pediastrum duplex, P. 

 boryanum; red cysts apparently of Peridiniuvi. 



Sample No. 16. Anodonta grandis footiana, 90 mm. long, sandy 

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

 Mussel gravid. Parasites: Atex, 3, free among gills, Atex embryos 

 scattered through gills. 



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

 Microcystis xruginosa, abundant; CoelosphxHutn keutzingianum, abun- 

 dant; Lyngbya sestuarii, a few filaments; Anursea cochlearis and 

 another rotifer; Botryococcus braunii; Sorastrum, Ccelastrum, Scenedes- 

 mus, Pediastrum duplex, Navicula, several; Melosira tabulata, Synedra, 

 Epithemia turgida, Cocconema cymbiforme; and other small diatoms 

 rather numerous. Cosmarium, a few. 



Sample No. 17. Anodonta grandis footiana, 93 mm. long, sandy 

 bottom of Lake Maxinkuckee near Norris Inlet, August 28, 1908. Mus- 

 sel gravid. Parasites: 1 Atax, free among gills. Intestines almost 

 empty. Microcystis seruginosa, one of most abundant elements; Lyng- 

 bya sestuarii, Ccelosphserium kuetzingiannnt, Botryococcus braunii; 



