LYMNZIDZ OF NORTH AMERICA. alipeal 
thirds the size of the more northern forms. Typical specimens of 
this small form, which does not seem important enough to receive a 
name, measure as follows: 
Length. Breadth. Aperture length. Breadth. 
10.00 6.50 7.00 4.50 Mill. Manatee Co., Fla. 
12.00 7.50 9.00 600) ss: Pass Christian, Miss. 
All of the Succinea-like Lymmnzeas have been united with columella 
by most recent authors, but there are strong reasons for admitting 
ceveral varieties. It was thought at one time that two distinct species 
could be recognized, but the large amount of material examined shows 
so many connecting links that a satisfactory specific diagnosis is 1m- 
possible. There are three fairly well marked varieties, however, which 
- should be recognized. 
Say’s macrostoma cannot be separated from columella when a 
large series of specimens is examined. As Haldeman remarks, it is 
a columella until it assumes the macrostomous form in the large ex- 
panded body whorl, which in typical macrostoma is flaring and quite 
patulous. The figures on the plate well illustrate the variation in the 
‘body whorl. (Pl. XXII, figs. 8, 10, 11, for example.) Von Martens 
questions the Mexican reference to this species in the Biologia Centrali 
Americana, but the records of Cooper and Rhoads confirm its concur- 
rence in Mexico. These records, however, should probably be referred 
to the race called championt. 
Pseudosuccinea columella chalybea (Gould). Plate XXIV, 
figures 5-13. 
Limnea chalybea A. A. Goutp, Amer. Journ. Sci., XX XVIII, p. 196, 1840.— 
GouLp, Invert., Ed. Binney, p. 472, 1870.—Sows., Conch. Icon., XVIII, Limn., 
sp. 52, pl. 8, fig. 52, a. b., 1872. 
Limnea chalybea Hatpv., Mon. Limn., p. 40, pl. 12, fig. 9, 1842—ANTHONY, 
fabow. Sh. Cimns Bids 2, 1848—GouLD, Otia, p. 180, 1862. 
Lymnea chalybea Linstey, Amer. Journ. Sci., XLVIII, p. 282, 1845.— 
Wueattey, Cat. U. S. Shells, p. 23, 1845.—Morse, Amer. Nat. III, pl. 11, fig. 18, 
1870.27 Ann. Rep. N. Y. State Mus., p. 53, 1875. 
Limnea columella var. chalybea Micuets, Bost. Journ. ING ely UW joy. aslo, 
1843.—GouLp, Invert. Mass., p. 210, fig. 149, 1841.—Prescott, Sh. Mass., No. 192, 
1842—Rrap, Cat., 1845.—Can. Nat. & Geol. II, p. 197, figure, 1857—BINNEY, 
Land & F. W. Sh. N. A., II, p. 34, fig. 40, 1865—Jay, Cat. Ed. 4, p. 268, 1852. 
Lymnea columella chalybea BAKER, Bull. Ill. Lab. N. H., VII, p. 103, 1906.— 
SterkI, Proc. Ohio State Acad. Sci., IV, p. 382, 1907.—Hanna, Nautilus, XXIII, 
p. 96, 1909. 
Lymnea columella var chalybea LERMOND, Shells of Maine, p. 37, 1908. 
Lymnea strigosa Lea, Proc. Amer. Phil. Soc., II, p. 33, 1841; Trans. Amer. 
Phil. Soc., IX.'p. 12, 1844; Obs., IV, p. 12, 1848. 
Lymnea strigosa WHEATLEY, Cat. U. S. Shells, p. 23, 1845 —Morse, Amer. 
Nat., III, pl. 11, fig. 19, 1870—Scupper, Bull. Nat. Mus., 23, pp. 33, 44, 201, 1885. 
