400 THE CHICAGO ACADEMY OF SCIENCES. 
part of Lake Michigan. After a northerly storm the beaches along 
the lake are strewn with the dead shells of Galba woodruffi. This is 
especially true at Millers, Indiana, where the beach is very wide and 
evenly sloping, and in the line of beach debris, this Lymnza may be 
found by thousands. It is very curious that not a single living speci- 
men has as yet been found. 
It has been suggested by Cockerell (Nautilus XVI, p. 96) that 
woodruffi might be a form of the European peregra, but a comparison 
with authentic specimens of that species shows it to be quite different. 
It is undoubtedly a native species. 
Galba decollata (Mighels). Plate XLII, figures 23-26; plate 
XLI, figures 8-10. 
Limnea decollata MicHets, Proc. Bost. Soc. N. H., I, p. 49, 1841.— 
MicHeEts & ApAms, Bost. Journ. Nat. H., IV, p. 45, pl. 4, fig. 13 (four views), 
1842.—MIGHELS, Bost. Journ. Nat. H., IV, p. 337, 1843——Stimpson, Sh. N. Eng., 
p. 52, 1851.—CHICKERING, List. Sh. Portland, Me., 1855 or 1856.—BELL, Geol. 
Surv. Can., Rep. Prog., p. 252, 1859.*—Binney, Check List, p. 12, 1860 —WHulIT- 
EAVES, Can. Nat. & Geol., VIII, p. 102, 1863.*—Binney, Land & F.-W. Sh. N. A., 
II, p. 31, figs. 36, 37, 1865—Datt, Proc. Bost. Soc. N. H., XIII, p. 240, 1870.— 
SmitH & Prime, Ann. Lyc. N. H., IX, p. 378, 1870.*—Goutp, Invert. Mass., 
Binney’s Ed., p. 473, fig. 725, 1870.—JEFFrEys, Ann. Mag. N. H., iv, X, p. 247, 
1872.—Sows., Conch. Icon., XVIII, Lim. sp. 42, pl. 6, fig. 42, 1872.—Tryon, 
Con. Hald., Mon.,; p. 90 (64), 1872.—JrErrreys, Journ. Conch., I, p. 16, 1874.— 
WESTERLUND, Vega Exp., IV, p. 165, 1885—CHAmBERS, Rep. Geol. & Nat. Hist. 
Surv., Canada, 1882-84, p. 46, GG, 1885.*—Ottawa Nat., IV, p. 55, 1890.*—TayLor, 
Ottawa Nat., VI, p. 33, 1892.*—STEarNs, Proc. Nat. Mus., XXIV, p. 291, 1901. 
Limnea catascopium var. decollata HARTMANN and MiIcHENER, Conchologia 
Cestrica, 1874 (part). 
Lymnea decollata WHEATLEY, Cat. U. S. Sh., Ed. 2, p. 23, 1845—Lins.ey, 
Amer. Journ. Sci, XLVIII, p. 282, 1845.*—Jay, Cat., 4th Ed., p. 268, 1852. 
Morse, Amer. Nat., III, p. 651, pl. 11, fig. 4, 1870-—Datt, Alaska Moll., p. 68, 
1905.—Lermonp, Shells of Maine, p. 38, 1908.—Brrry, Nautilus, XXIV, p. 62, 
1910.—Watker, Journ. Conch., XII, p. 240, 1909. 
Limneus decollatus KtstTer, Conch. Cab., Ed. 2, p. 45, taf. 8, figs. 12, 14, 
1862 (figs. 11 & 13 are not decollata). 
Limnea decollata HALDEMAN, Mon. Limn., p. 52, pl. 14, figs. 1-3, 1842. 
Radix decollata Morse, Journ. Bost. Soc. N. H., I, p. 42, 1864. 
Neristoma decollata Tryon, Amer. Journ. Conch., I, p. 248, 1865. 
Limnea catascopium? HALDEMAN, Mon. Lim., p. 52, 1842 (non Say). 
Lymnea mighelsi DALL, Alaska Moll., p. 68, fig. 45, 1905 (non Binney). 
SHELL: More or less ventricose, subovate or irregularly rhomboid, 
thin to thick; periostracum olivaceous green color; some specimens 
are almost jet black; surface shining, growth lines crowded, fine in 
*These records marked with an asterisk are very doubtful. They probably 
were based on short spired forms of catascopium, Specimens received from 
Mr. F. R. Latchford are referable to the short spired form of catascopium, 
