274 THE CHICAGO ACADEMY OF SCIENCES. 



Amer. Phil. Soc., IX, p. 9, 1844; Obs., IV, p. 9, 1848; Expl. in Neb., II, pt. 3, 

 p. 724, 1859 



Lymncea philadelphica WHEATLEY, Cat. Sh. U. S., p. 24, 1843. SCUDDER, 

 Bull. Nat. Mils., 23, pp. 33, 43, 201, 1885. 



Limnea philadelphica HALD., Mon. Limn., p. 33, pi. X, fig. 10, 1842. 

 ANTHONY, L. & F.-W. Sh. Gin., 1848. 



Limnaa philadelphica BINNEY, Land & F. W. Sh. N. A., II, p. 50, fig. 71, 

 1865. TRYON, Amer. Journ. Conch., Ill, p. 196, 1867. SOWB., Conch. Icon., 

 XVIII, Sp. 82, pi. 12, fig. 82, 1872. 



Lymncea galbana var. philadelphica DALL, Alaska Moll., p. 74, fig. 52, 1905. 



Lymncea desidiosa var. philadelphica JAY, Cat., p. 269, 1852. 



Lymnea acuta LEA, Trans. Amer. Phil. Soc., V, p. 114, pi. 19, fig. 81, 1837 ; IX, 

 p. 12, 1841 ; Obs., I, p. 226, 1837. LEA, Proc. Phil. Acad., 1860, p. 147. 



Lymncea acuta WHEATLEY, Cat. Sh. U. S., p. 23, 1845. SCUDDER, Bull. Nat. 

 Mus., 23, pp. 14, 200, 1885. 



Limnea acuta HALD., Mon. Limn., p. 33, pi. 10, fig. 14, 1842. ANTHONY, 

 L. & F.-W. Sh. Cin., 1848. 



Limncea acuta BELL, Geol. Surv. Canada, Rep. Prog., p. 252, 1859. BINNEY, 

 Land & F.-W. Sh. N. A., II, p. 5, fig. 70, 1865. TRYON, Amer. Journ. Conch., 

 Ill, p. 196, 1867. 



Lymncea desidiosa var. acuta JAY, Cat., p. 269, 1852. 



Limncea pallida (not of Adams) CPR., Rep. Brit. Asso., pp. 209, 213, 1856. 

 WHITEAVES, Can. Nat. & Geol., VI, p. 458, 1861. CPR., Can. Nat. & GeoL, VI, 

 p. 458, 1861; Smith. Mis. Coll., pp. 120, 160, 1872. CALKINS, Proc. Ottawa 

 Acad. Sci., p. 25, 1874; Cin. Quart. Journ. Sci., I, p. 323, 1874. ?DAWSON, Brit- 

 ish N. A., Bound Com., p. 349, 1875. WALTON, Proc. Roch. Acad. Sci., II, p. 12, 

 pi. 6, figs. 12, 13, 1891. CURRIER, Kent. Sci. Inst. Mis. Pub., No. 1, 1868 

 WALKER, Journ. Conch., II, p. 330, 1879. SHIMEK, Bull. Lab. N. H., Univ. Iowa, 

 I, p. 68, 1888. WALKER, Nautilus, VI, p. 34, 1892; Rev. Moll. Mich., p. 17, 

 1894. WALTON, The Museum, IV, p. 133, 1894. BAKER, Trans. Acad. Sci. St. 

 Louis, VIII, p. 89, 1898. HUETT, Nat. Hist. La Salle Co., p. 104, 1898. LETSON, 

 Bull. N. Y. State Mus., LXXXVIII, p. 55, 1905 (part). 



Lymncea pallida LEA, Proc. Phil. Acad., p. 81, 1856. CURRIER, Sh. Grand 

 River, Mich., 1859. BAKER, Bull. 111. State Lab., VII, p. 105, 1906. 



Limncea pallida LETSON, Bull. Buf. Soc. Nat. Sci., IX, p. 242, 1909. 



Limnea pallida MILES, Geol. Surv., Mich., 1860, p. 237, 1861. 



Limnophysa pallida DECAMP, Kent. Sci. Inst., Mis. Pub., No. 5, p. 8, 1881. 

 KEYES, Bull. Essex Inst., XX, p. 71, 1888. 



f Limncea truncatula WOODWARD, Man., -p. 399. 



SHELL: Subconic, pointed, oblong, rather thin, frequently some- 

 what inflated; periostracum generally light yellowish horn color; sur- 

 face shining, covered with numerous coarse lines of growth; under 

 a strong lens very fine spiral lines may be seen; whorls 5^2, rounded, 

 somewhat shouldered, the shoulder being near the suture; the last 

 whorl is very large, half the length of the entire shell, generally com- 

 pressed but quite obese in some specimens ; spire acute, sharply-conical ; 

 nuclear whorls 1%, resembling those of Galba parva in outline and 



