LYMNZIDZ OF NORTH AMERICA. 205 
Gippons, Journ. Conch., II, p. 129, 1879—Cr. and Fiscw., Moll. Mex., II, pp. 
47, 50, pl. 27, figs. 12, 12a, 1880.—Cressin, Mal. Blatt., N. S., III, p. 83, 1881.— 
Crosse, Journ. de Conch. XXXVIII, p. 260,1890—Pirspry, Proc. Phil. Acad., 
1891, p. 320.—CrossE, Journ. de Conch., XX XIX, p. 157, 1891; XL, p. 35, 1892.— 
Simpson, Proc. Nat. Mus., XVII, pp. 438, 444, 1894.—Ruoaps, Nautilus, XIII, 
p. 47, 1899.—MartTeEns, Biol. Cent. Amer. Moll., p. 378, 1898—Datt and Srmp- 
son, Bull. U. S. Fish Com., XX, pt. 1, 369, 1900.—FiscuH. and Crosse, Mis. Scient. 
Mex. Moll., I, taf. 27, figs. 32, 32a; II, p. 50, 1880. 
Lymneus cubensis SHUTTLEWoRTH, Mitt. Natur. Ges., Bern, I, 1854, p. 98. 
Limneus cubensis Ktster, Conch. Cab., p. 32, taf. 6, figs. 6, 7, 8, 1862. 
Lymnea cubensis Tryon, Amer. Journ. Conch., II, p. 11, 1866. 
Lymnea cubensis H1nkKiey, Nautilus, XXI, p. 78, 1907-——-Watker, Nauti- 
lus, XXII, pp. 7, 8, pl. II, fig. 3, 1908; Ottawa Nat., XXII, pp. 89, 90, 1908. 
Limnea humilis Stmpson, Proc. Dav. Acad. Sci., V, p. 69, 1896—JoHNSON, 
Nautilus, III, p. 139, 1890. 
?Limnea umbilicata, C. B. ApAMs, Proc. Bost. Soc. Nat. Hist., II, p. 134, 
1846; Contributions to Conchology, p. 45, 1849; Ann. N. Y. Lyc. N. H., V, p. 111, 
1852; Contr. to Conch., No. 9, p. 187, 1852. 
Limnea umbilicata HENDERSON (on Adams), Nautilus, VIII, p. 33, 1894. 
?Limnea umbilicata CRANDALL, Nautilus, VI, p. 103, 1893. 
Lymnea lecontu Lea, Proc. Phil. Acad., 1864, p. 113; Journ. Phil. Acad., 
VI, p. 162, pl. 24, fig. 79, 1866; Obs., XI, p. 118, pl. 24, fig. 79, 1867—ScuppER, 
Bull. Nat. Mus., 23, pp. 148, 201, 1885. 
Limnophysa lecontii Tryon, Amer. Journ. Conch., I, p. 255, 1865. 
Limnea lecontiti Tryon, Con. Hald., Mon., p. 105 (79), pl. 18, fig. 4, 1872. 
SHELL: Small, ovate to roundly ovate; periostracum light horn, 
varying to pearl gray in some specimens; surface with close-set, rather 
rough and irregular lines of growth; spiral lines very faint; nuclear 
whorls similar in outline to those of truncatula; under a power of 100 
diameters the apical whorls appear finely striate; whorls 514-6, well 
rounded, rapidly increasing in size; the whorls are usually inclined to 
be shouldered; spire of medium length, broadly pyramidal or acute, 
about as long as the aperture; sutures well impressed ; aperture roundly 
ovate, somewhat angled above; periostome thin, acute; inner lip folded 
backward and forming a broad, flat, somewhat triangular expansion, 
leaving a well marked umbilical chink; there is a very thin wash of 
callus on the parietal wall; the axis is not twisted but forms a large, 
wide, smooth, hour-glass-shaped column. 
Length. Breadth. Aperture length. Width. Locality. 
9.00 5.00 5.00 3.00 mill. Havana, Cuba 
8.00 5.50 4.50 3.00 ae e a 
- 4.00 4.50 4.00 2500s = 4 
11.25 7.25 6.25 S255 as Cuba 
7.50 5.00 4.00 2:50) os Mexico 
10.50 6.00 5.50 3100) i 
7.50 4.50 4.00 25 0tie lecontii 
