226 THE CHICAGO ACADEMY OF SCIENCES. 
Can. Rep. Prog., p. 252, 1859——Brinney, Check List, p. 12, 1860.—r?LAPHAM, 
Proc. Phil. Acad. 1860, p. 155.—?BinNEy, Proc. Phil. Acad., p. 330, 1861.— 
BELL, Can. Nat. & Geol., VI, pp. 42, 46, 1861—Wu1tTEAvEs, Can. Nat. & Geol., 
VIII, p. 103, 1863.—Tryon, Proc. Phil. Acad., 1863, p. 149—Conn. Geol. Can., 
pp. 969, 985, 1864—Binnegy, L. & F. W. Sh. N. A., II, p. 56, fig. 87, 1865.— 
CurriER, Kent. Sci. Inst., Mis. Pub., No. 1, 1868—SmitH and Primer, Ann. Lyc. 
N. H., IX, p. 378, 1870.—Goutp, Invert. Mass., Ed. Binney, p. 481, fig. 732, 
1870.—Sowersy, Conch. Icon., XVIII, Lim., sp. 53, pl. 8, fig. 53, 1872.—Tryon, 
Con. Hald. Mon., p. 106 (80), 1872—Ca.kins, Proc. Ottawa Acad. Sci., p. 25, 
1874; Cin. Quart. Journ. Sci., I, pp. 243, 323, 1874—Smitu, U. S. Fish Com. 
Rep., 1872-73, p. 702, 1874.—Yarrow, U. S. Geog. Surv. 100th Merid., V, p. 944, 
1875.—Dawson, British N. A. Bound. Com., p. 349, 1875.—Pratt, Proc. Daven. 
Acad. Sci., I, p. 166, 1876—WitTTER, Journ. Conch., I, p. 387, 1878—WALKER, 
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Dept. of Stat. & Geol., 1880, p. 458—Catt, Amer. Nat., XV, p. 586, 1881.— 
Curisty, Journ. Conch., IV, p. 347, 1885.—Ottawa Nat., II, p. 264, 1885.—BEau- 
cHamp, L. & F.-W. Sh. N. Y., p. 3, 1886—H. F. Crr., Random Notes N. H., 
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N. H. Univ. Iowa, I, pp. 68, 208, 1888; Amer. Geol., I, p. 151, 1888.—H. F. Crr., 
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Lab. Nat. Hist. Univ. Iowa, I, p. 200, 1890—Watton, Proc. Roch. Acad. Sci., 
II, p. 12, 1891—StTearns, Proc. Nat. Mus., XIV, p. 101, 1891.—Pirspry, Proc. 
Phil. Acad., 1891, p. 320.—McGer, Rep. U. S. Geol. Surv., XI, p. 461, 1891.— 
TaAyLor, Ottawa Nat., VI, p. 33, 1892—-WaLkeEr, Nautilus, VI, p. 34, 1892.— 
Dean, Amer. Nat., XXVI, p. 11, 1892—MarsHALL, Rep. N. Y. State Mus., 
XLVII, p. 65, 1893—Stearns, N. A. Fauna, VII, p. 274, 1893—-MaRsHALL, 
N. Y. at World’s Col. Exp., p. 512, 1894——Watker, Rev. Moll. Mich., 1894, p. 
17.—Pinspry, Proc. Phil. Acad., 1894, p. 24.—SguveEr, Nautilus, VIII, p. 65, 
1894.—Taytor, Ottawa Nat., IX, p. 175, 1895——Ottawa Nat., IX, p. 156, 1895.— 
SARGENT, Nautilus, IX, p. 127, 1896-—Wrswatt, Nat. Sci. Journ., I, p. 45, 1897.— 
SHIMEK, Proc. Iowa Acad. Sci., V, pp. 35, 44, 1898.—Baxer, The Museum, III, 
p. 154, 1897; Journ. Cin gSoc. IN. «HL, XIX, p. 78, 1897; Nautilus, XTi pieos, 
1898; Trans. Acad. Sci. St. Louis, VIII, p. 89, 1898—Topp, Proc. Iowa Acad., 
VI, pp. 124, 125, 1898—Watton, The Museum, IV, p. 133, 1898—Baxker, Moll. 
Chi. Area., pp. 23, 24, 1898—HANHAM, Nautilus, XIII, p. 5, 1899—LEVERETT, 
Mon. U. S. Geol. Surv., XXXVIII, pp. 173, 174, 1899—Ctapp, Nautilus, XIV, 
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Acad. Sci. St. Louis, XI, p. 10, pl. 1, fig. 11, 1991—SuHimex, Bull. Lab. N. H. 
Univ. Iowa, V, p. 207, 1901; Amer. Geol., XXVIII, p. 353, 1901.—STEarns, Proc. 
Nat. Mus., XXIV, p. 291, 1901.—BAker, Amer. Nat., XXXV, p. 662, 1901.— 
SuimeEK, Geol. Surv. Iowa, p. 264, 1901.—Etrop, Bull. Univ. Mont., Biol. Ser., 
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1904.—Letson, Bull. N. Y. State Mus., LXXXVIII, p. 55, 1905——-CHApDwICcK, 
Bull. Wis. Nat. Hist. Soc., n. s., IV, p. 82, 1906.—Nautilus, XX, p. 22, 1906. 
Limnea caperata Hatp., Mon. Limn., p. 34, pl. 11, figs. 1-8, 1842.—DeKay, 
p. 69, pl. 4, figs. 66, 69, pl. 5, fig. 79, 1843—HaLtpeMAN, Rupps. Hist. Lanc. Co., 
