342 THE CHICAGO ACADEMY OF SCIENCES. 



Range: Illinois, Indiana, Michigan, Ohio. A form of the humid 

 divisions of the Transition and Upper Austral life zones, and of the 

 Canadian and Upper Mississippian regions. The range of walkeri will 

 probably be found to be coexistent with that of typical rcflcxa. It has 

 doubtless been recorded as rcflcxa and labeled as such in collections. 



RECORDS. 



UNITED STATES. 



Illinois: Lake George and Calumet River, Cook Co. (Baker); Calumet 

 Lake, Cook Co. (Calkins) ; Joliet, Will Co. (Ferriss) ; Wolf Lake, Cook Co. 

 (Jensen); Kendall Co. (Hinkley) ; Algonquin and Silver Lake, McHenry Co.; 

 Cook Co. (Nason) ; Stony Island, Chicago, Cook Co. (Zetek). 



Indiana: Hessville, Lake Co. (Walcott). 



Michigan: River Rouge, Wayne Co. (Walker); Saginaw Valley, Sagi- 

 naw Co. (Walker); Detroit, Wayne Co. (Miss Walker). 



Ohio: Near Cincinnati, Hamilton Co. (Lea). 



Geological Range: Unknown. 



Ecology : Walkeri lives under much the same conditions as does 

 re flex a. 



Remarks: Walkeri is distinguished by its very long, scalar spire 

 and the narrowness of the shell compared with its length; the whorls 

 are generally well rounded. While this variety is quite distinct in 

 some localities, it is found in other places to gradually grade into typical 

 rcflcxa. The variety is distinguishable from rcflcxa, the characteristics 

 of the long, well-rounded whorls, narrow shell, deep sutures and the 

 absence of the rapid enlargement of the last two whorls being sufficient 

 to cause its immediate recognition. From an ecological point of view, 

 as walkeri is the dominant form in some localities, it seems quite de- 

 sirable to recognize it as a race. Specimens raised in the greenhouse 

 of the University of Chicago were all referable to walkeri. It lacks 

 the "puffy" aspect of the penultimate whorl, so markedly developed 

 in typical reflexa. 



Galba reflexa hemphilliana (Baker). Plate XXXVI, figures 

 19-20. 



Limnoea reflexa hemphilliana Baker, Nautilus, XVIII. p. 11, May. 1904. 



Shell : Elongate-ovate, rather solid ; color light horn ; surface 

 shining, with distinct spiral lines ; whorls six, very flat-sided, somewhat 

 oblique, loosely coiled ; nuclear whorls very dark red ; spire short, wide, 

 acutely pyramidal, about as long as the aperture; sutures not deeply 

 impressed ; aperture ovate, or elongate-ovate ; peristome thin, bordered 

 by a red-banded internal rib; inner lip narrow, reflected and almost 

 closing the umbilicus, leaving a very small chink; the columella is 

 slightly twisted and there is a rather heavy ascending plait. The sur- 

 face is lightly malleated. 



