334 THE CHICAGO ACADEMY OF SCIENCES. 



Lymncea reftexa GOULD, Lamarck's Genera, p. 69, 1833. Amer. Journ. 

 Sci., XXXI, p. 36, 1837. WHEATLEY, Cat. Sh. U. S., p. 23, 1845. JAY, Cat., 

 p. 270, 1852. REEVE, Elements of Conch., p. 179, 1860. WOLF, Amer. Journ. 

 Conch., VI, p. 28, 1870. SCUDDER, Bull. Nat. Mus., 23, p. 201, 1885. BAKER, 

 Amer. Nat., XXXIX, p. 671, 1905. BALL, Alaska Moll., p. 77, fig. 58, 1905. 

 BAKER, Bull. 111. State Lab. N. H., VII, p. 105, 1906. WALKER, Nautilus, XX, 

 p. 82, 1906. STERKI, Proc. Ohio State Acad. Sci., IV, p. 382, 1907. BAKER, 

 Bull. 111. State Lab. N. H., VIII, p. 493, pi. 25, fig. 1, 1910. H. BAKER, An. Rep. 

 Mich. Acad. Sci., XII, p. 60, 1910. 



Limncea reHexa iowaensis BAKER, Nautilus, XVIII, p. 10, 1904; Bull. 111. 

 State Lab. N. H., VII, p. 106, 1906. 



Limnceus palustris var. distortus ROSSMASSLER, Icon., I, p. 97, pi. 2, fig. 52, 

 1835. BINNEY, L. & F. W. Sh. N. A., II, p. 41, fig. 52, 1865. 



Limncea distorta JORDAN, Nova Acta Ksl.-Leop.-Carol. Deutsch Akad. 

 Natur., XLV, p. 368, 1883. CKLL., Journ. Conch., VI, p. 257, 1890. 



Limnophysa palustris CALL, Indiana Mollusca, pi. 8, fig. 5, 1900. 



Limnaa rcflexa, crystalensis BAKER, Nautilus, XVIII, p. 11, 1904; Bull. 

 111. State Lab. N. H., VII, p. 106, 1906; VIII, p. 493, pi. 25, figs. 2, 3, 1910. 



Lymnea reftexa crystalensis HANNA, Nautilus, XXIII, p. 96, 1909. 



Lymn&a palustris michiganensis BAKER, Bull. 111. State Lab. N. H., VIII, 

 p. 493, pi. 25, figs. 4-8, 1910. 



SHELL: Very much elongated, narrow, thin, sometimes scalar; 

 color honey-yellow to black, sometimes obscurely longitudinally banded ; 

 surface shining, covered with numerous closely crowded growth lines, 

 with fine impressed spiral lines which reticulate the surface ; the growth 

 lines are also wavy and elevated, in some specimens forming ridges 

 of considerable size; nuclear whorls smooth, brownish or blackish, in 

 form like those of palustris (pi. XLIX, fig. K) ; whorls seven, flatly 

 rounded, last whorl much compressed; the sixth and seventh whorls 

 are much longer in comparison with their width than are any of the 

 preceding whorls ; spire very long and pointed, occupying nearly two- 

 thirds of the entire length of the shell; sutures impressed; aperture 

 lunate or elongate-ovate, narrowed at the upper part, very oblique and 

 effuse in some specimens; peristome thin, sharp, thickened by a heavy 

 callus or varix on the inside, the varix chocolate or purplish in color; 

 lower part of peristome dilated; inner lip narrow, reflected over the 

 umbilical region, leaving a very small chink or entirely closing the 

 umbilicus ; columella oblique, with a heavy plait across its center, run- 

 ning up into the whorl; the callus on the parietal wall varies from a 

 very thin wash to an erect, thick inner lip which causes the aperture 

 to be continuous ; axis twisted. 



