408 THE CHICAGO ACADEMY OF SCIENCES. 



body whorl is also more flat-sided and the inner lip is narrower. It 

 differs from jacksonensis in its flat-sided whorls and narrower inner 

 lip in addition to its longer aperture. 



The types of gabbii show that the specific characters are fairly 

 constant and do not connect it with any other species. Tryon's figure 

 in the American Journal of Conchology is very good. Cooper (op. cit.) 

 considered it a variety of both adclina and catascopium. The speci- 

 mens examined show but little variation. 



GROUP OF GALBA EMARGINATA. 



Galba emarginata (Say). Plate XXX, figures 27-28; plate XLI, 

 figures 18-24; plate XLIII, figures 1-12. 



Lymnaus emarginatus SAY, Journ. Phil. Acad., II, p. 170, 1821; Long's 

 Exp., II, p. 263, 1824; Binney's Ed., pp. 67, 130, 1858. 



Limnceus emarginatus SAY, Amer. Conch., part VI, pi. 55, fig. 1, 1834 ; 

 Binney's Ed., pp. 67, 140, 211, pi. 55, fig. 1, 1858. KUSTER, Conch. Cab., I, p. 44, 

 taf. 8, figs. 6-10, 1862. 



Limnea emarginata HALDEMAN, Mon. Lim., p. 10, pi. 2, figs. 1-5, 1842. 

 DEKAY, Zool. N. Y., p. 73, 1843 (part). GOULD, Agassiz's Lake Sup., p. 244, 

 1850. INGERSOLL, Bull. U. S. Geol. & Geog. Surv., I, p. 139, 1875 (part) ; Rep. 

 U. S. Geol. & Geog. Surv. Terr., 1874, p. 406, 1876 (part). 



Lymncea emarginata GOULD, Lamarck's Genera, p. 69, 1833. RAVENEL, Cat. 

 Sh., p. 11, 1834. WHEATLEY, Cat. Sh. U. S., Ed. 2, p. 23, 1845. JAY, Cat., Ed. 

 4, p. 268, 1852. REEVE, Elements of Conch., p. 178, I860. BAKER, Amer. Nat., 

 XXXIX, p. 671, figs. 6, 7, 1905. D ALL, Alaska Moll., p. 68, 1905 (part). BAKER, 

 Bull. 111. State Lab., VII, 102, 1906. WALKER, Nautilus, XXII, p. 18, pi. 1, fig. 

 1, 1908. LERMOND, Shells of Maine, p. 38, 1908. WALKER, An. Rep. Mich. 

 Geol. Surv., 1908, p. 290, 1909. GLEASON, 1. c., pp. 60-62, 1908. 



Limn&a emarginata GOULD, Proc. Bost. Soc. N. H., Ill, p. 181, 1850. 

 STIMPSON, Sh. N. E., p. 52, 1851. ULFFERS, Trans. 111. State Ag. Soc., I, p. 612, 

 1855. 1 REEVE, P. Z. S., 1862, p. 105. BINNEY, L. & F.-W. Sh. N. A., II, p. 51, figs. 

 75, 77, 79, 1865 (part). CURRIER, Kent. Sci. Inst, Pub. No. 1, 1868. TRYON, 

 Con. Bald. Mon., p. 110 (84), 1872. Sown., Conch. Icon., XVIII, Lim., sp. 35, 

 pi. 7, figs. 35, b, c, pi. 15, fig. 47 a, 1872 (the figures are not all typical). SMITH, 

 Rep. U. S. Fish Com., 1872-73, p. 702, 1874. AUGHEY, Bull. U. S. Geol. & Geog. 

 Surv., Ill, p. 700, 1877. 2 WALKER, Journ. Conch. II, p. 330, 1879 (part). Ottawa 

 Nat., I, p. 58, 1882 (part). LATCHFORD, Amer. Nat., XVIII, p. 1052, 1884 (part). 

 Ottawa Nat., II, p. 264, 1885 (part). Ottawa Nat., IV, p. 55, 1890 (part). 

 WALKER, Nautilus, VI, p. 34, 1897 (part). TAYLOR, Ottawa Nat., VI, p. 35, 1892 

 (part). WALKER, Rev. Moll. Mich., p. 17, 1894 (part) ; Nautilus, IX, p. 5, 1895. 

 NYLANDER, Nautilus, VIII, p. 126, 1895. TAYLOR, Ottawa Nat, VIII, p. 147, 

 1895 (part). NYLANDER, Nautilus, XI, p. 10, 1897; Nautilus, XIII, p. 104, 1900; 

 Nautilus, XV, p. 127, 1901; Destr. of L. Emarg., p. 3-4, 1901. STEARNS, Proc. 

 Nat. Mus., XXIV, p. 291, 1901 (part). ADAMS, Rep. Mich. Geol. Surv., 1908, 

 p. 10, 1909. 



*It is impossible to verify this record which was undoubtedly not based 

 on the true emarginata. 



2 This record has not been substantiated. No specimens of emarginata or 

 of its varieties have been seen from Nebraska. 



