ORTMANN: monograph of the naiades op PENNSYLVANIA. 39 



and others, that these forms belong to the same species, surely is founded upon the 

 observation of transitions, and I also think that schoolcruftensis should not be 

 separated specifically, although the conditions in Pennsylvania would suggest 

 such a step. 



It should be mentioned that specimens from Lake Erie show the regular and 

 distinct growth-lines, commonly observed in shells from Lake Erie. 



Localities represented in the Carnegie Museum: 



Lake Erie, Presque Isle Bay, Erie, Erie Co., Pennsylvania. 



Lake Erie, Cedar Point, Erie Co., Ohio (C. Brookover). 



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



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



Maumee River, Defiance, Defiance Co., Ohio (C. Goodrich). 



Grand River, Grand Rapids, Kent Co., Michigan (G. H. Clapp donor). 



Coon River, Dallas Co., Iowa (Smith collection). 



Meramec River, Meramec Higlilands, St. Louis Co., Missouri (N. M. Grier). 



Hinkston Creek, Columbia, Boone Co., Missouri (D. K. Greger). 



Platte River, Garretsburg, Buchanan Co., Missouri (W. I. Utterback). 



Kansas and Wakarusa Rivers, Lawrence, Douglas Co., Kansas (R. L. Moodie).'^ 



Clukaskia River, Tonkawa, Kaj' Co., Oklahoma (F. B. Isely). 



In addition, there is a fine large specimen, labeled Poland, Mahoning Co., Ohio, and two others, 

 labeled: Grand River, Ohio, all from the Hartman collection. Those from the latter locality were named 

 dorfeuillanus, with the remark; " Lea datum," and thus they are supposed to be authentic specimens 

 from Lea. But I believe, that these localities are unreliable. These specimens are so typically repre- 

 sentative of the form from Lake Erie (with very distinct and regular growth-lines) that I tliink they are 

 undoubtedly from the lake. The fauna of Grand River in Oliio is practically unknown. Poland is 

 near the Mahoning River, and we know, that the typical pusiulosa is found in the Pennsylvanian part 

 of this river.''^ 



Distribution and Ecology in Pennsylvania (See fig. 5) : In Pennsylvania, this 

 form has been found only in Presque Isle Bay of Lake Erie, in the characteristic 

 fine sand of the " flats " and the North shore (" Big Bend ") of the bay, where 

 the shore is lined with the Juncus americanus formation, in one to two feet of water. 

 It appears to be a rare shell there, since only two specimens have turned up. 



General Distribution: Type locality, "Fox River of Green Bay" in Wisconsin 

 (Lea). (This belongs to the Lake Michigan-drainage, and is at the same time the 

 most northern locality known.) 



From Lake Erie, this form has been reported before as Q. pustulosa (Walker, 

 1913). Aside from the localities given above for the lake, it is found in some of 



'^ Some of these specimens, when received, were labeled (by Scammon?) Quadrula rubiginoiin ! 



'^ Dean (1890) does not report pusiulosus from the ]Mahoning in Oliio, nor docs Sterki (1907a), 

 but both have pustulatus Lea, which is a species not at all found in tliis region. Probably, Dean's puslu- 

 latiis is only a slip of the pen for pvshdosus. 



