OF NORTH AMERICA. 341 



lowaensis Baker cannot be separated from reflexa in a large series, 

 and must become a synonym (pi. XXXV, fig. 9) ; the characters relied 

 upon in the diagnosis are not constant, being founded on an immature 

 condition. In the Illinois and Michigan Canal at Joliet, Illinois, 

 occurs a form of reflexa which is subject to many peculiar pathologic 

 variations. These affect the spire and the aperture, and produce many 

 strange forms. Plate XXXVI, figures 1 to 6, illustrate a few of these 

 variations, and several measurements are given below: 



Length. Width. Aperture length. Width. 



20.00 10.00 11.50 6.00 mill. 



21.00 9.00 11.00 6.00 " 



22.50 10.00 11.00 6.00 " 



28.00 9.50 11.50 6.50 " 



When at its best, reflexa is easily the handsomest Lymnaea of the 

 American fauna, with its long, graceful spire and rich chestnut brown 

 color. 



Galba reflexa walked (Baker). Plate XXXVI, figures 12-18. 

 Limncca reflexa scalaris WALKER, Nautilus, VI, p. 33, pi. 1, fig. 7, 1892 

 (not scalaris A. BRAUN, 1853, or SOWERBY, 1872, or VAN DEN BROECK, 1872). 

 WALKER, Rev. Moll. Mich., pp. 7, 17, 1894; Nautilus, VII, p. 128, 1894. BAKER, 

 Trans. Acad. Sci. St. Louis, XL, p. 21, pi. 1, fig. 7, 1901. WALKER & LANE, 

 Geol. Surv. Mich., VII, pt. 2, p. 251, 1900. 



Limncea refaxa walkeri BAKER, Moll. Chi. Area., II, p. 281, pi. 31, fig. 2, 

 1902. 



Lymnaa reflexa walkeri BAKER, Bull. 111. State Lab. N. H., VII, p. 106, 

 1906. 



Limncea reflexa var. distortus WALKER, Journ. Conch., II, p. 330, 1879. 

 Limnaa reflexa distortus WALKER, Rev. Moll. Mich., p. 17, 1894. 

 SHELL: Much elongated, narrow, scalariform; color and surface 

 sculpture as in reflexa; whorls 7 to iy 2) rounded, very long; spire over 

 twice as long as the aperture; sutures much indented; aperture nar- 

 rower and longer than in reflexa, the inner lip frequently erect and 

 the aperture continuous. 



Length. Width. Aperture length. Width. 



37.00 11.00 12.00 6.00 mill. Calumet- Lake, 111. 



35.50 9.50 12.50 5.00 " 



35.50 9.00 11.00 5.00 " Joliet, 111. 



37.50 9.00 12.50 6.00 " Algonquin, 111. 



37.00 10.00 13.00 5.50 " Wolf Lake, 111. 



37.00 10.50 10.50 5.50 " Calumet Lake, 111. 



TYPES : Collection Bryant Walker, Detroit, Mich., five specimens, 

 No. 146. 



TYPE LOCALITY: Rouge River, Wayne County, Mich. 

 ANIMAL, JAW, RADULA and GENITALIA: Not examined. 



