280 



mm. Parasites: 7 free Atax among gills. Many small red eggs of 

 Atax on inner surface of mantle. Food chiefly Microcystis aeruginosa; 

 Botryococcus braiinii; and Navicula. 



Sample 28. Lampsilis hiteola. Lost Lake, September 7, 1908. Live 

 weight 3% oz. ; length 104 mm., alt. 54 mm., diameter 33 mm. Para- 

 sites: Atax 6, free among gills, eggs of Atax on inner side of mantle, 

 young in pits on side of foot. Food, Microcystis seruginosa, most com- 

 mon; Li/ngbya sestuarii; Navicula; Melosira; Anursea; and Cocconenia. 



Intestinal contents of two examples of L. luteola obtained in Lake 

 Maxinkuckee August 27, 1908, near the shore just north of the ice 

 office gave the following results: 



Sample 29. Microcystis aeruginosa, main mass; Anursea cochlearis, 

 a few; Botryococcus braunii, rather common; Cocconenia cymbiforme, 

 one; Lyngbya sestuarii, 1 filament; Navicula, 2 examples; Synedra, a 

 few. 



Sample 30. Microcystis aei-uginosa, main mass; Botryococcus 

 braunii, very common; Lyngbya sestuarii, several filaments; Anurxa 

 cochlearis, a few; Synedra, some; Navicula, one example very lively; 

 Cosmarium, one; Round woim like vinegar eel, very lively. 



Sample 31. Lost Lake, 1908. A good mass of material, blackish 

 below, flocculent greenish above. Lyngbya aestuarii, a few filaments, 

 Microcystis aeruginosa, quite abundant; Amiraea cochlearis; sponge 

 spicule; Pediastinim duplex; Staurasti'um; Botryococcus braunii; Peri- 

 dinium tabulatum, a few; Peridiniuni, a small spiny species 1; Pedias- 

 tnim boryanum; several diatoms — Navicula; Coscinodiscus; Melosira; 

 Cocconenia cymbiforme ; Microcystis, is the most abundant element; Peri- 

 dinium is rather scarce. 



Sample 32. Lake Maxinkuckee, August 27, 1908: A small amount 

 of brownish green flocculent material. Anursea cochlearis, quite fre- 

 quent; Lyngbya aestuarii, short filament; Peridiniuni tabulatum, a few; 

 Coelastrum microporum; Ccelosphserium kuetzingianum; Pediastrum 

 boryanum; Scenedesmus, very few; Chydorus, fragment. Diatoms, Epi- 

 themia turgida; Navicula; Cocconema cymbiforme; Gomphonema; Cos- 

 cinodiscus. 



Sample 33. Lake Maxinkuckee, August 27, 1908: A fair amount of 

 brownish green material, muddy below, flocculent green above. The 



