LYMNEIDA OF NORTH AMERICA. 261 
XXI, p. 83, 1887.—Cx.i., Ann. Mag. N. H., ser. 5, XIX, p. 176, 1887—SHIMEK, 
Amer. Geol., I, p. 151, 1888; Bull. Lab. N. H., Univ. Iowa, I, p. 69, 1888; Bull. 
Lab. N. H. Univ. Iowa, I, p. 209, 1888 —HoLziNcER, Rep. Nat. Hist. Surv. Minn., 
XVI, p. 490, 1888.—Crr., Cat. Moll. R. I. Ed. 2, p. 5, 1889.—Suimek, Bull. Lab. 
N. H. Univ. Iowa, I, pp. 209-212, 1890—Ottawa Nat., IV, p. 56, 1890.—Woop, 
Nautilus, V, p. 56, 1891—Sampson, Ann. Rep. Geol. Surv. Ark., II, p. 193, 
1891.—Fox, Nautilus, IV, p. 114, 1891.—McGer, Rep. U. S. Geol. Surv., XI, pp. 
461, 471, 1891—P eas, Nautilus, IV, p. 181, 1891.—Taytor, Ottawa Nat., VI, 
p. 35, 1892.—SINGLEy, Rep. Geol. Sury. Texas, IV, p. 188, 1892; p. 313, 1893.— 
Dean, Amer. Nat., XXVI, p. 18, 1892.—Watker, Nautilus, VI, p. 34, 1892.— 
MarsHALL, Rep. N. Y. State Mus., XLVII, p. 65, 1893.— VauGHAN, Amer. Nat., 
XXVII, p. 944, 1893.—SAMpPson, Nautilus, VII, p. 33, 1893——STEarNns, N. Am. 
Fauna, VII, p. 275, 1893—Pirssry, Proc. Phil. Acad., 1894, p. 24.—SQUYER, 
Nautilus, VIII, p. 65, 1894—STUPAKOFF, Nautilus, VII, p. 135, 1894——WALKER, 
Rev. Mol. Mich., p. 17, 1894—MarsHatt, Rep. N. Y. World’s Fair, p. 512, 1894; 
Rep. N. Y. State Mus., XLVIII, p. 642, 1895—Suicx, Nautilus, WANGE, Go, ies) 
1895.—Harper, Journ. Cin. Soc. N. H., XVIII, p. 95, 1895—WuitEAvEs, Ottawa 
Nat., IX, p. 22, 1895.—SarcenT, Nautilus, IX, p. 127, 1896—Dana, Geology, Pp. 
966, 1896.—Pitspry and RHOADS, Proc. Phil. Acad., 1896, p. 493.—Uppen, Proc. 
Towa Acad., V, p. 103, 1897.—BakER, Nautilus, XI, p. 30, 1897—Wuswa Lt, Nat. 
Sci. Journ., I, p. 47, 1897.—SHIMEK, Proc. Iowa Acad. Sci., V, pp. 35, 44, 1897.— 
Hersuey, Amer. Journ. Sci., iv, IV, p. 96, 1897.—Pirspry, Amer. Journ. Sci., 
iv, V, p. 233, 1898.—Topp, Proc. Iowa Acad., VI, p. 127, 1898.—Baker, Trans. 
Acad. Sci. St. Louis, VIII, p. 89, 1898; Nautilus, XII, p. 65, 1898—WALKER, 
Nautilus, XI, p. 122, 1898—BEyYeER, Proc. Iowa Acad., VI, p. 118, 1898.—Pits- 
pry, Nautilus, XIII, p. 65, 1899; Nautilus, XIII, p. 79, 1899.—Smitu, Nautilus, 
XIII, p. 35, 1899.—Baxer, Nautilus, XIII, p. 30, 1899—Hanuam, Nautilus, XIII, 
p. 6, 1899.—LerveretT, Mon. U. S. Geol. Surv., XXXVIII, pp. 169, 170, 171, 172, 
1899.—Topp, Proc. lowa Acad. Sci., VI, p. 12%, 1899.—Srerkr, An. Rep. Ohio 
State Acad. Sci., VIII, p. 34, 1900.—Pitspry, Nautilus, XIV, p. 10, 1900.—PRICcE, 
Nautilus, XIV, p. 76, 1900.—Pirs. & Cock., Nautilus, XIV, p. 86, 1900.—STEARNS, 
Nautilus, XIII, p. 101, 1900; Nautilus, XIII, p. 132, 1900.—SHIMEK, Amer. Geol., 
XXVIII, p. 354, 1901; Geol. Surv. Iowa, p. 264, 1901; Bull. Lab. N. H. Univ. 
Iowa, V, p. 208, 1901.—STEARNS, Proc. Nat. Mus., XXIV, p. 288, 1901.—BAKER, 
Trans. Acad. Sci. St. Louis, XI, p. 9, pl. 1, fig. 14, 1901.—Sterk1, An. Rep. Geol. 
Surv. Tex., III, p. 263, 1901—DAaNIELS, An. Rep. Dept. Geol. Nat. Res. Ind., 
XXVII, p. 637, 1902.—Exrop., Bull. Univ. Mont. Biol., ser. No. 3, p. 172, 1902.— 
Baker, Moll. Chi. Area, p. 268, pl. 30, fig. 21, text fig. 86, 1902.—SHIMEK, Geol. 
Surv. Iowa, 1902, pp. 171, 172.—WALKER, Geol. Surv. Mich., VIII, pt. 3, p. 101, 
1903.—Baxer, Nautilus, XVII, p. 39, 1903.—FULLER & Crappr, Bull. Geol. Soc. 
Amer., XIV, p. 162, 1903—SHIMEK, Bull. Lab. N. H. Univ. Iowa, V, p. 379, 1904. 
—Baxer, Nautilus, XVII, p. 113, 1904—Keep, West. Amer. Sh., p. 314, 1904.— 
Baker, Trans. Acad. Sci. St. Louis, XTV, p. 103, 1904.—LETson, Bull. N. Y. State 
Mus., LXXXVIII, p. 56, 1905.—CHApWICK, Bull. Wis. Nat. Hist. Soc., n. s., iv, p. 
82, 1906; Nautilus, XX, p. 22, 1906.—W Heat, Bull. Brook. Conch. Club., I, p. 10, 
1907.—Letson, Bull. Buf. Soc. Nat. Sci., IX, p. 242, 1909. 

Limnea humilis DeKay, Zool. N. Y., p. 71, pi. 4, figs. 71, a. b., 1843— 
Micuets, Bost. Journ. N. H., IV, p. 336, 1843.—HatpeMan, Rupp’s Hist. Lane. 
Co., p. 480, 1844.—AntuHony, L. & F.-W. Sh. Cin., 1848—Goutp, Agassiz’s Lake 
