eo 
cas) 
Or 
LYMNEIDZ OF NORTH AMERICA. 
slightly reflected, with a small perforate umbilicus behind it; pillar 
straight, with no twist or fold, outer lip thin, sharp.” ( Dall.) 
Length. Breadth. Aperture length: Breadth. 
11.00 8.50 7.00 4.50 mill 
Tyre: Smithsonian Institution, one specimen, No. 175557. 
Type Locatitry: Nushagak, Bristol Bay, Alaska. 
ANIMAL, JAW, RaApuLaA and Geniratia: Unknown. 
Rance: Alaska. Evidently typically a boreal species of the Hud- 
sonian life zone. 
RECORDS. 
ALASKA: Nushagak, Bristol Bay (Dall). 
GEOLOGICAL RANGE: Unknown. 
Ecotocy: Not recorded. 
ReMARKS: “This shell is so elegantly polished that it may be an 
Amphipeplea. It has the rich dark amber color of some Succineas. 
No other American species has an equally polished surface, so far as 
I have observed.” (Dall.) 
An examination of the type specimen of this species shows that 
it is allied to the cubensis group, having the same arrangement of inner 
lip as well as the smooth, polished surface. It is not the same as the 
Sonoma County shells collected by Hemphill, as suggested by Dr. Dall, 
these being a distinct species (sonomensis). A series of specimens 
of this species is very desirable. 
Galba caperata (Say). Piate XXVIII, figures 20-33; plate 
XXIX, figures 1-3. . 
Lymneus caperatus Say, New Harmony Dis., II, p. 230, 1829. 
Lymneus caperatus Say, Binney’s Ed., p. 148, 1858. 
Limneus caperatus KtUsTer, Conch. Cab., p. 47, taf. 8, figs. 27-30, 1862. 
Lymne@a caperata WHEATLEY, Cat. Sh. U. S., Ed. 2, p. 23, 1845.—Lins.ey, 
Am. Journ. Sci., LX VIII, p. 282, 1845.—Jay, Cat., Ed. 4, p. 268, 1852.—Lera, 
Journ. Phil. Acad., VI, p. 160, 1866; Obs., XI, p. 116, 1867.—Scupper, Bull. Nat. 
Mus., 23, p. 200, 1885—Datt, Alaska Moll., p. 79, fig. 63, 1905—-BaAKer, Bull. 
Ill. State Lab. N. H., VII, p. 104, 1996—Watke_r, Nautilus, XX, p. 82, 1906.— 
HeEnperson, Univ. Colo. Studies, IV, pp. 81, 93, 158, 180, fig. 39, 1907.—STERKI, 
Proc. Ohio State Acad. Sci, IV, p. 382, 1907—WaLkErR, Ottawa Nat., XXII, 
pp. 89, 90, fig. 2, 1908.—LrErMonp, Shells of Maine, p. 38, 1908.—Daniets, Nauti- 
lus, XXII, p. 121, 1909—Berry, Nautilus, XXIII, p. 77, 1909.—HeENpERsoN, 
Univ. Col. Studies, VII, p. 126, 1999—Baker, Bull. Ill. State Lab. N. H., VIII, 
p. 492, et seq., 1910. 
Lymnea caperata Girard, Proc. Nat. Inst., I, No. 2, p. 81, 1856—Dawson, 
Can. Nat. and Geol., n. s. VI, p. 387, 1872. 
Limnea caperata C. B. Av., Amer. Journ. Sci., XL, p. 268, 1841; Thomp. 
Hist. Vt., pt. 1, p. 154, 1842—Antuony, List Sh. Cin., 1843.—Stimpson, Sh. 
N. Eng., p. 52, 1851——Apams, Exp. Red River, p. 244, 1854—Hiccrns, Cat. Sh. 
Columbus, p. 6, 1858—Bett, Can. Nat. and Geol., IV, p. 213, 1859; Geol. Surv. 

