164 MEMOIRS OF THE CARNEGIE MUSEUM. 



Conneauttee Lake, Edinboro, Erie Co. 



Other localities represented in the Carnegie Museum: 



Lake-drainage: 

 Lake Eric, La Plaisance Bay, Monroe Co., Michigan (C. Goodrich). 

 Miami and Erie Canal, Lucas Co., Ohio (C. Goodrich). 



Ohio-drai7iagc: 

 -VTuscarawas River, Ohio (Holland collection). 



Scioto River, Columbus, Franklin Co., Ohio (H. H. Smith). 

 Wabash River, Bluffton, Wells Co., Indiana (C. Goodrich). 



Tennessee-drainage : 

 Paint Rock River, Paint Rock and Princeton, Jackson Co., Alabama (H. H. Smith). 



West of Mississippi: 

 James River, Galena, Stone Co., Missouri (A. A. Hinkley). 

 Lawrence, Douglas Co., Kansas (R. L. Moodie). 

 Ouachita River, Arkadelphia, Clark Co., Arkansas (H. E. Wheeler). 

 Big Deceiper Creek, Gum Springs, Clark Co., Arkansas (H. E. Wheeler). 

 Black Bayou, Victoria Co., Texas (D. A. Atkinson). 



A labama-drainage : 

 Black Warrior River, Lock 11, Tuscaloosa, Tuscaloosa Co., Alabama (H. H. Smith). 

 Pond at Holt, Tuscaloosa Co., Alabama (H. H. Smith). 



Beaver Creek and Canoe Creek, St. Clair Co., Alabama (H. H. Smith) (Coosa-drainage). 

 Othkalooga Creek, Calhoun, Gordon Co., Georgia (H. H. Smith) (Coosa-drainage). 



A ilanUc-drainage : 

 Greenfired Mill, Wilmington, New Hanover Co., North Carolina (G. H. Clapp donor). 



Distribution and Ecology in Pennsylvania (See fig. 14) : This species is restricted 

 to the northwestern section of our state (Erie Co.), and is principality found in 

 Lake Erie, where it inhabits the sandy shores of Presque Isle Bay and the beach- 

 pools at the eastern end of Presque Isle. At two places I discovered it in the 

 Ohio-drainage, in the headwaters of French Creek, in Conneauttee Lake, in the 

 black muck of this lake; in the other case, at the outlet of Leboeuf Lake, on partly 

 muddy bottom, in slack water, and partly on gravelly bottom and on shell marl 

 in more strongly flowing water. 



Baker (1898a) records it from muddy bottoms in creeks, smaU rivers, and 

 ponds, and Scammon (1906) calls it a lover of quiet water and muddy or somewhat 

 sandy banks. This agrees well with my observations. 



The peculiar distribution in Pennsylvania resembles somewhat that of certain 

 other species, which are found only in the northwestern part of our state. 



General distribution: Type locality, Ohio River (Rafinesque). 



Simpson (1900) says: "Entire Mississippi-drainage area; southern Michigan; 

 North Carolina to Georgia; southwest to Matamoras, Mexico." This indicates a 



