lymnveim: of north America. 377 



Ecology : Not recorded. 



Remarks : This small and enigmatical Lymnseid has been a puz- 

 zle for several years. It was at first thought to be a small form of 

 the protean palustris but that species does not range as far south as 

 Virginia, and the present form is quite unlike the large shells of the 

 northern states. It is apparently a new species, though belonging to 

 the palustris group of the subgenus Stagnicola. 



Ncopalustris may be distinguished from palustris by its uniformly 

 smaller size, its more obese body whorl, rounder aperture, narrower 

 inner lip and particularly by the long, fiat slope of the upper part of 

 the whorls. It bears a superficial resemblance to some small forms of 

 palustris from England. A special search should be made for this 

 species in Virginia and adjacent states. 



GROUP OF GALBA CATASCOPIUM. 



Galba pallida (Adams). Plate XL, figures 1-5. 



Limncea pallida Adams, Amer. Journ. Sci., i, XXXIX, p. 374, 1840; Bost. 

 Journ. Nat. Hist., Ill, p. 324, pi. 3, fig. 13, 1840; Amer. Journ. Sci., i, XL, p. 

 268, 1841; Thomp. Hist. Vt, p. 153, 1842.— Bell, Geol. Surv. Can., Rep. Prog., 

 p. 252, 1859.— Binney, Check List., p. 12, 1860; L. & F.-W. Sh. N. A., II, p. 60, 

 fig. 95, 1865. — Morch, Amer. Journ. Conch., IV, p. 35, 1868. — Dall, Proc Bost. 

 Soc. N. H., XIII, p. 248, 1870.— Gould, Inv. Mass., Ed. Binney, p. 481, fig. 

 733, 1870.— Jeffreys, Ann. Mag. N. H., ser. iv, X, p. 247, 1872.— Sowb., Conch., 

 Icon., XVIII. Lim., sp. 81, pi. 12, fig. 81 a, b, 1872.— Tryon, Con. Hald. Mon., 

 p. 106 (80), 1872.— Jeffreys, Journ. Conch., I, p. 16, 1874.— Clessin, Mai. Blatt, 

 n. s., Ill, p. 82, 1881.— Marshall, Rep. N. Y. State Mus., XLVII, p. 64, 1893; 

 New York at World's Fair, p. 512, 1894.— Letson, Bull. N. Y. State Mus., 

 LXXXVIII, p. 55, 1905 (part). 



Limnea pallida Hald., Mon. Lim., p. 45, pi. 13, figs. 11-13, 1842. — DeKay, 

 Zool. N. Y., p. 69, pi. 4, fig. 67, 1843. 



Lymncea pallida Wheatley, Cat. Sh. U. S., p. 23, 1843.— Jay, Cat., p. 270, 

 1852.— Scudder, Bull. Nat. Mus., 23, p. 201, 1885. 



Limnophysa pallida Tryon, Amer. Journ. Conch., I, p. 255, 1865. — Lewis, 

 Bull. Buf., Soc. Nat. Sci., II, p. 135, 1874 (part). 



Limnceus pallidas Kuster, Conch. Cab., p. 49, taf. 11, figs. 1-4, 1862. 



Limncea pallida 1 Whiteaves, Can. Nat. & Geol., VIII, pp. 51, 103, 1863. — 

 Beauchamp, L. & F.-W. Sh. Onondaga Co., p. 4, 1886. — Ckl., Journ. Conch., 

 VI, p. 257, 1890.— Taylor, Ottawa Nat., VIII, p. 148, 1895. 



Lymncea pallida Lewis, Proc. Phil. Acad., p. 102, 1872. 



Shell : Ovate-fusiform, elongated, rather solid ; periostracum 

 pale yellowish horn, sometimes semi-transparent; surface shining, 

 growth lines heavy and very well marked, crowded, crossed by fine 

 impressed spiral lines; whorls 5 to 5^, flatly convex, the body whorl 



J The following' references are very doubtful; it has not been possible to 

 verify them as in most cases the original specimens have not been preserved. 

 Some of the records may have been based on the true pallida, while others 

 undoubtedly refer to forms of obrussa, catascopium or palustris. 



