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THE NATURAL HISTORY SURVEY. Pa | 
110c. Limnza palustris expansa Hald., pl. xxxii, fig. 2. 
Limnea expansa HALDEMAN, Mon., p. 29, pl. ix, figs. 6-8, 1842. 
Limneus suffiatus W. W. CALKINS, MSS. 
This form seems distinct enough to constitute a variety. 
It is characterized by the spire and aperture being of equal 
length, the whorls inflated and the aperture expanded and 
shouldered at the upper part: In this area it has been found 
only in the Calumet River. The figure is from Calkins’ type of 
suffiatus. 
Length, 26.00; width, 138.00; aperture length, 15.00; width, 8.00 mill. (8875.) 
1i1. Limmneza ferrissi, N. Sp., pl. xxxi, fig. 26. 
Shell: Rather thin, elongated, scalariform, rimate; color 
light horn; surface dull to shining, lines of growth conspicuous, 
crossed by impressed spiral lines; whorls six, regularly in- 
creasing, convex, the last almost round; spire sharply conic, 
two-thirds the length of the entire shell; sutures deeply im- 
pressed; apex rounded, deep wine color; aperture roundly 
oval, one-third the length of the shell, brownish within; peri- 
stome thin, sharp, continuous; columella reflected, thickened 
by a callus, and with a faint plait; umbilicus narrow, deep. 
Length, 11.00; width, 5.50; aperture length, 4.50; width, 3.00 mill. 
Animal, jaw, radula and genitaha not examined, 
Distribution: Rock Run, Joliet, Ill. 
Habitat: Similar to Limnea palustris. 
Remarks: Ferrisst has a strong resemblance to Limnea hol- 
bolla Beck and MOIl., and if collected in Siberia or Greenland 
would certainly be so identified. The specimens under con- 
sideration were collected by Mr. J. H. Ferriss in Rock Run, 
near Joliet, and seem to constitute a very distinct species, 
characterized by rounded, scalariform whorls. It does not 
seem to be common and has been found only in Rock Run. 
112. Limnza reflexa Say, pl. xxxii, fig. 6; pl. xxxi, fig. 1. 
Limnea reflexus SAY, Journ, Phil. Acad., Vol. II, p. 167, 1821. 
Limnaus elongatus SAY, 1.c., p. 167, 1821. 
Limneus palustris var. distortus ROSSMASSLER, Icon., Vol. I, p. 97, 
pl. ii, fig. 52, 1835, 
Limnea lanceata GOULD, Proc. Bost. Soc. N. H., Vol. III, p. 64, 1848. 
(Variety.) 
Limnea zebra TRYON, Amer. Journ. Conch., Vol. I, p. 228, pl. xxiii, 
fig. 4, 1865. 
Shell: Very much elongated, narrow, thin, sometimes 
scalar; color honey-yellow to black, sometimes obscurely lon- 
