LYMNAIDA OF NORTH AMERICA. isi 
52.00 31.00 32.50 20.00 “ Elba River, Germany. 
38.00 19.00 21.50 S200) a "e 5 
RANGE: Circumboreal; North America north of about the 40th 
parallel; Europe, the Caucasus, northern and western Asia. 
REMARKS: Stagnalis is one of the most characteristic as it is the 
largest of the Lymnzeas. No examples approaching the typical form 
as found in Europe have been seen by the writer except several speci- 
mens in the Smithsonian Institution from Slave River, 25 miles below 
Peace River, Athabaska (No. 180204) and from Lake Harrison, lat. 
70° north (No. 25913). These specimens are scarcely typical enough 
to be retained under stagnalis, however, and would seem to more 
logically range under the variety appressa of Say, to which the majority 
of American stagnalis should be referred. The specimens from the 
United States and Canada are easily referred to appressa, but those 
occurring in the northwestern part of British America and in Alaska 
are more like the typical form, showing the influence of the Siberian 
fauna and clearly indicating that stagnalis is a migrant from Asia via 
the ancient land connection at Bering Strait. The American specimens 
differ from the typical form in the shape of the body whorl and in 
the form of the spire, besides in other minor points. 
Lymneza stagnalis appressa (Say). Plate XIX, figures 4-10; 
plate XX, figures 1-6; plate XXII, figures 1-3. 
Lymneus appressus Say, Journ. Phil. Acad., II, p. 168, 1818; Binney’s 
Reprint, p. 66, 1858. 
Lymnea appressa Goutp, Lamarck’s Genera, p. 69, 1833.—Lera, Proc. Amer. 
Phil. Soc., IX, p. 8, 1841.—WueatLey, Cat. Sh. U. S., p. 23, 1845.— 
LEA., obs., IV, p. 8, 1848.—Jay, Cat. ed. 4, p. 268, 1852—Lewis, 
Proc. Phil. Acad., 1856, p. 259.—REEvE, Elements of Conch., p. 178, 
1860.—Lewis, Proc. Phil. Acad., 1860, p. 17—Morsre, Amer. Nat., 
III, p. 651, pl. 11, fig. 2, 1870.—Scupper, Bull. U. S. Nat. Mus., 23, 
p. 200, 1885. 
Lymnea stagnalis appressa BAKER, Amer. Nat. XXXIX, p. 667, figs, 3, 4, 
1905; Trans. St. Louis Acad., XVI, p. 10, 1906; Bull. Ill. State Lab. 
N. H., VII, p. 102, 1906—HeEnverson, Univ. Colo. Studies, IV, pp. 
93, 179,, 1907—Daniets, Nautilus, XXII, p. 120, 1909—WaALKER, 
An. Rep. Geol. Surv. Mich., 1908, p. 289, pl. 63, fig. 4, 1909. 
Lymnea appressa DEKAy, Cat. N. Y. Animals, p. 32, 1839.—Currier, Shells 
Grand River, Mich., 1859. 
Limnea appressa HALDEMAN, Mon. Limn., p. 18, pl. 5, 1842—DexKay, Moll. 
N. Y., p. 74, 1843.—MizeEs, Geol. Surv. Mich., p. 237, 1860.—Cat. Nat. 
Hist. Eth. Prov. Mus. Victoria, p. 95, 1898. 
Limnea appressa Breck, Index, p. 113, 1837——ApAms, Amer. Journ. Sci., i, 
XL, p. 267, 1841; Thomp. Hist. Ver., pt. 1, p. 153, 1842—Sr7impson, 
Shells of New England, p. 52, 1851—Mog.-Tanp., Moll. France, 
II, p. 471, 1855.—Binney, Check List, p. 12, 1860; Proc. Phil. Acad., 
