44 University of Michigan 



Actinonaias Ugamentina (Lam.). Habitat 33. Large: 1. 

 198.7 mm.; alt. 159.6 mm.; w. 62.3 mm. 



Lampsilis lideola (Lam.). Habitats: 8, 30, 33, 35. Largest 

 male: 1. 113 mm.; alt. 63.5 mm.; w. 48.6 mm.; largest female: 

 1. 88.3 mm. ; alt. 57.8 mm. ; w. 41 mm. 



Lamps'ilis ventricosa (Barnes). Habitats: 8; 33. 



KEY TO MAP 



Map I. Sketch Map op Brown Lake and Vicinity 



(As no accurate maps of this region were available, and time 

 could not be taken to make a more precise survey, this map was 

 sketched by the writer to show the approximate shape of the lake and 

 the relations of the various habitats.) 



Hardwoods shown by scalloped border. 



Pines regions (unburned) by asterisks. 



Marsh by conventional symbols. 



Extensive rock outcrops (at Rock Dam) by shading. 



Numbers refer to those of habitats. 

 C — Camp; headquarters. 

 4-8 — Brown I<ake. 



9 — Tamarack Lake. 

 10 — Jackson Lake. 

 12 — Sedge Swamp. 

 IS — Former Channel, East 



Branch. 

 18 — McKinnon Brook. 

 23 — South Creek. 

 26, 28 — Hancock Creek. 

 27 — Beaver Pond. 

 29 — Rock Dam, West Branch. 

 32 — Sturgeon River. 

 22, — East Branch, below Lake. 

 45 — East Branch, above Lake. 



