ORTMANN: monograph, of the naiades of PENNSYLVANIA. 135 



Ohio-drainage: 

 Ohio River, Wheeling, Ohio Co., West Virginia (W. F. Graham); Portland, Meigs Co., Oliio.*' 

 Wolfe Creek, Wolfe Creek P. 0., Wasliington Co., Ohio (W. F. Graham). 

 West Fork White River, Riverside, Green Co., Indiana (J. D. llaseman). 

 Wabash River, New Harmony, Posey Co., Indiana (A. A. Hinklcy). 

 Middle Island Creek, Union Mills, Pleasants Co., West Virginia. 

 Pocatalico River, Raymond City, Putnam Co., West Virginia. 



West of Mississippi: 

 Roch6-Perche Creek, Columbia, Boone Co., Missouri (D. K. Greger). 

 Kansas River, Lawrence, Douglas Co., Kansas (R. L. Mobdie). 

 Solomon River, Salina, Saline Co., Kansas (R. L. Moodie). 

 Black River, Black Rock, Lawrence Co., Arkansas (H. E. Wheeler). 

 Cliikaskia River, Tonkawa, Kay Co., Oklahoma (F. B. Isely). 



Alabama-drainage : 

 Big Prairie Creek, Hale Co., Alabama (Dr. Showalter, Hartman collection). 

 Cahaba River, Gurnee, Shelby Co., Alabama (H. H. Smith). 



Distribution and Ecology (See fig. 12): Type-locality, Fox River, Wisconsin 

 (Barnes) . 



The distribution of this species in Pennsylvania is very remarkable. It is 

 found only in two places; in both in the outlet of a glacial lake. At Conneaut 

 Outlet I found this species in rather strongly flowing water, with a soft bottom of 

 muddy sand; in Leboeuf Creek in a soft shell-marl. At both places the size of 

 the stream is about the same, rather small, with the supply of water uniform, 

 regulated by the lake above. 



Wliile at both localities the species is quite frequent, no trace of it has ever 

 been found in any other stream in this state. Down the Ohio, it turns up for the 

 first time at Wheeling, and further down at St. Marys, Parkersburg, and Portland. 

 But at St. Marys it is not in the Ohio proper, but in the slackwater of Aliddle 

 Island Creek, which goes up about five miles (to Union Mills) . In the Kanawha- 

 drainage it goes up to Pocatalico River, in the lower part of which it is not rare, 

 being chiefly found in quiet and muddy pools. 



L. complanata has been reported to prefer deep and quiet water with muddy 

 bottoms (Bakei-, 1898a, CaU, 1900, Scammon, 1906) although Scammon mentions 

 that it is occasionally found in riffles and in gravel. I have found it under such 

 conditions in the smaller branch of the Ohio at Portland, but only a single indi- 

 vidual. The lack in Pennsylvania of the environment it prefers accounts for its 

 absence in the upper Ohio-drainage in general. So much more astonishing is its 

 presence in the outlets of two glacial lakes, and I am not prepared to say, which 



*" I have also seen dead shells at Parkersburg, Wood Co., West Virginia, in the small branch of the 

 Ohio at Neal Island. 



