LYMNZID2 OF NORTH AMERICA. 185 
Limnea (Bulimnea) megasoma BELL, Rep. Geol. and Nat. Hist. Surv. 
Canada, 1879-1880, p. 75, 1881. 
?Lymnea megasoma Lorp, Nat. in Brit. Col., II, p. 363, 1866. 
Lymnea megasoma WHEATLEY, Cat. Sh. U. S., p. 23, 1845.—Jay, Cat., ed. 
4, p. 270, 1852——Morse, Amer. Nat., III, p. 651, pl. 11, fig. 1, 1870—Hyarrt, 
Amer. Nat. XIV, p. 71, 1880—WzHutTFIELD, Bull. Amer. Mus. Nat. Hist., I, 
p. 29, 1881—Dati, Land and F. W. Moll., p. 67, fig. 44, 1905 ——BAxKer, Amer. 
Nat., XXXIX, p. 676, 1905; Nautilus, XX, p. 36, 1906—LatcHForD, Nautilus, 
XX, p. 83, 1906—SreRKI, Proc. Ohio State Acad. Sci., IV, p. 381, 1907.— 
Watker, An. Rep. Geol. Surv. Mich., 1908, p. 290, 1909—Cotton, Proc. Phil. 
Acad., 1908, p. 421. 
Limnea megalosoma SANDBERGER, Conch. de Urw., p. 581, 1873. 
Bulimnea megasoma CHENU, Man. Conch., II, p. 480, fig. 3543, 1862.— 
Lewis, Bull. Buf. Soc. Nat. Hist. II, p. 135, 1874—-WeEtTHERBy, Journ. Cin. 
Soc. Nat. Hist., II, p. 93, 1879—Grant, Rep. Nat. Hist. Surv. Minn., XIV, p. 
122, 1886; XVI, p. 483, 1888—Keryes, Bull. Essex Inst., XX, p. 70, 1888. 
Bulimnea megasoma Tryon, Amer. Journ. Conch., I, p. 249, 1865.—Da tt, 
Ann. Lyc. Nat. Hist., IX, p. 349, 1870.—Dercamp, Kent. Sci. Inst., Mis. Pub., 
No. 5, p. 7, 1881—Catt, Bull. U. S. Geol. Surv., II, p. 383, 1884. 
SHELL: Large, ovate, inflated, bulimiform; periostracum brown- 
ish, greenish or olive, with, in many specimens, longitudinal streaks 
of green, orange, purple or ochraceous; surface strongly marked with 
growth lines, which are raised to form wide, flat ridges in some speci- 
mens; the spiral, wavy lines of the Lymnzas are present, but are rather 
faint; some specimens are strongly malleated; nuclear whorls 1% 
in number, dark chestnut colored in some specimens, light yellowish 
horn in others; outline of second whorl shouldered near the suture 
of the first whorl; texture that of satin finish (pl. XLIX, fig. B); 
whorls 5-5%, rounded, somewhat flattened at the previous sutures; 
spire varying from rather pointed to depressed dome-shaped ; sutures 
well impressed; aperture large, subovate, inflated, chestnut brown or 
dark purple within, occupying from half to two-thirds the length of 
the entire shell; peristome thin; parietal wall with a thin wash of 
callus which is tightly appressed to the body whorl, completely closing 
the axis; pillar twisted, forming a raised, prominent ascending plait. 
Length. Breadth. Aperture length. Breadth. 
43.25 22.50 26.25 12.10 mill. Type. 
35.50 20.50 22.75 O50 ee * 
36.00 21.00 22.50 TP Pls ve 
40.50 22.00 24.50 EHO) 
41.00 23.50 24.50 14.00 “ 
44.00 21.00 24.50 12550) 
41.00 21.00 24.00 12:00; 
47.00 27.00 21.00 14.00 “ 
Type: Academy of Natural Sciences of Philadelphia, 2 speci- 
mens, No. 58388. 
