OF NORTH AMERICA. 225 



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 



TYPE: Smithsonian Institution, one specimen, No. 175557. 



TYPE LOCALITY : Nushagak, Bristol Bay, Alaska. 



ANIMAL, JAW, RADULA and GENITALIA: Unknown. 



RANGE : Alaska. Evidently typically a boreal species of the Hud- 

 sonian life zone. 



RECORDS. 



ALASKA: Nushagak, Bristol Bay (Dall). 



GEOLOGICAL RANGE: Unknown. 



ECOLOGY: 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 (sonomcensis) . A series of specimens 

 of this species is very desirable. 



Galba caperata (Say). Plate XXVIII, figures 20-33; plate 

 XXIX, figures 1-3. 



Lymnceus caperatus SAY, New Harmony Dis., II, p. 230, 1829. 



Lymneus caperatus SAY, Binney's Ed., p. 148, 1858. 



Limnaus caperatus KUSTER, Conch. Cab., p. 47, taf. 8, figs. 27-30, 1862. 



Lymnaa caperata WHEATLEY, Cat. Sh. U. S., Ed. 2, p. 23, 1845. LINSLEY, 

 Am. Journ. Sci., LXVIII, p. 282, 1845. JAY, Cat., Ed. 4, p. 268, 1852.- LEA, 

 Journ. Phil. Acad., VI, p. 160, 1866; Obs., XI, p. 116, 1867. SCUDDER, Bull. Nat 

 Mus., 23, p. 200, 1885. DALL, Alaska Moll., p. 79, fig. 63, 1905. BAKER, Bull. 

 111. State Lab. N. H., VII, p. 104, 1906. WALKER, Nautilus, XX, p. 82, 1906. 

 HENDERSON, Univ. Colo. Studies, IV, pp. 81, 93, 158, 180, fig; 39, 1907. STERKI, 

 Proc. Ohio State Acad. Sci., IV, p. 382, 1907. WALKER, Ottawa Nat., XXII, 

 pp. 89, 90, fig. 2, 1908. LERMOND, Shells of Maine, p. 38, 1908. DANIELS, Nauti- 

 lus, XXII, p. 121, 1909. BERRY, Nautilus, XXIII, p. 77, 1909. HENDERSON, 

 Univ. Col. Studies, VII, p. 126, 1909. BAKER, Bull. 111. 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. 



Limncea caperata C. B. AD., Amer. Journ. Sci., XL, p. 268, 1841; Thomp. 

 Hist. Vt., pt. 1, p. 154, 1842. ANTHONY, List Sh. Cin., 1843. STIMPSON, Sh. 

 N. Eng., p. 52, 1851. ADAMS, Exp. Red River, p. 244, 1854. HIGGINS, Cat. Sh. 

 Columbus, p. 6, 1858. BELL, Can. Nat. .and Geol., IV, p. 213, 1859; Geol. Surv. 



