428 THE CHICAGO ACADEMY OF SCIENCES. 
1870.—Da.t, Alaska Moll., p. 68, fig. 46, 1905.—Baker, Trans. Acad. Sci. St. 
Louis, XVI, p. 12, 1906. 
Limnea emarginata Lewis, Proc. Bost. Soc. N. H., V, p. 124, 1855.—Bin- 
ney, L. & F.-W. Sh. N. A., II, p. 52, fig. 76, 1865——Watcker, Journ. Conch., II, 
p. 330, 1879 (part).—Ottawa Nat., I, p. 58, 1882 (part).—LatcHrorp, Amer. Nat., 
XVIII, p. 1052, 1884 (part).—Ottawa Nat., II, p. 264, 1885 (part).—BEAU- 
CHAMP, L. & F.-W. Sh. N. Y., p. 3, 1886.—Ottawa Nat., IV, p. 55, 1890 (part) — 
Wacker, Nautilus, VI, p. 34, 1892 (part)—Taytor, Ottawa Nat., VI, p. 35, 
1892 (part) —MarsHa.L, Rep. N. Y. State Mus., XLVII, p. 65, 1893; N. Y. 
World’s Col. Exp., p. 510, 1894—WatkeEr, Rev. Moll. Mich., p. 17, 1894 (part).— 
TAyLor, Ottawa Nat. VIII, p. 147, 1895 (part)—Mavury, Chautauqua Lake 
Shells, p. 26, fig. 2, 1898—Baker, Nautilus, XIII, p. 58, 1899—Baxer, Bull. Chi. 
Acad. Sci., II, p. 193, pl. 1, figs. A, E, 1900.—Watvker & Lang, Geol. Surv. Mich., 
VII, pt. 2, p. 251, 1900.—STeEarns, Proc. Nat. Mus., XXIV, p. 291, 1901 (part).— 
Letson, Bull. N. Y. State Mus., LXXXVIII, p. 54, 1905 (part). 
Limnophysa emarginata Lewis, Bull. Buffalo Soc. N. Sci., II, p. 135, 1874. 
Radix ampla Lewis, Bull. Buf. Soc. N. Sci., I], p. 135, 1874. 
Limnea ampla AvpricuH, Rep. N. Y. State Cab. N. H., XXII, pp. 19, 23, 
1868..—_BrAucHAMP, L. & F.-W. Sh. N. Y., p..9, 1886.—MitTcHELL, Nautilus, 
XIII, p. 89, 1899.—MarsSHALL, Rep. N. Y. State Mus., XLVIII, p. 643, 1895.— 
Letson, Bull. N. Y. State Mus., LXXXVIII, p. 52, 1905. 
Limnea barbadensis SowErBy, Conch. Icon., XVIII, Limn. sp. 100, pl. 14, 
fig. 100, 1872.—Cr. & Fiscu., Mis. Cient. Mex., II, p. 47, 1880.—Pitspry, Nauti- 
lus, XXIII, p. 120, 1910. 
Limneus barbadensis (BrEcK) C Lessin, Conch. Cab. p. 379, taf. 50, fig. 2, 
1886. 
SHELL: Elongated to ovate, varying from thin to rather thick; 
periostracum very light horn, sometimes darker, pellucid; nuclear 
whorls small, smooth, rounded, consisting of 114 white or horn colored 
whorls in outline similar to those of catascopium; surface and sculp- 
ture as in emarginata; whorls 5% to 6, rounded, convex, the body 
whorl quite convex; spire typically long, attenuated, but shorter and 
depressed in some individuals; sutures well impressed; aperture long- 
ovate, occupying from half to three-fourths the length of the shell, 
much expanded and flaring in some forms; interior of the aperture 
varying from white to brownish; peristome thickened by a white 
varix; inner lip wide, raised, reflected over the umbilical region either 
entirely closing the perforation or leaving a small chink; the parietal 
callus is usually rather thick and sometimes becomes heavy and raised 
so as to render the aperture continuous; the umbilical chink is emar- 
gined as in the typical form; in some specimens the columella has a 
heavy, ascending plait; axis twisted. 
1This record has not been verified. It may have been based on speci- 
mens of catascopium. 
