398 THE CHICAGO ACADEMY OF SCIENCES. 
nasoni, but that species is larger, has a more regularly globose shell, 
a longer spire and broader inner lip which emargins the umbilical 
chink. Nasoni belongs to the catascopium group, while apicina is a 
member of the emarginata group. 
The species is named in honor of Dr. William A. Nason, of 
Alongquin, [linois, who collected the specimens. 
Galba woodruffi (Baker). Plate XLII, figures 18-22. 
Limnea catascopium pinguis BAKER (non Say), Trans. Acad. Sci., St. 
Louis, XI, p. 5, pl. 1, fig. 12, 1901. 
Limnea woodrufii BAKER, Bull. Chi. Acad. Sci., II, p. 229, fig. 1901; Moll. 
Chi. Area, II, p. 264, pl. 31, fig. 8, 1902—BLaTcHLEY & Dantets, An. Rep. Dept. 
Geol. & Nat. Res., Ind. XXVII, p. 598, pl. 1, fig. 16, 1902.—Daniets, I. c, 
p. 636, 1902—CKLL., Nautilus, XVI, p. 96, 1902. 
Lymnea woodrufi BAKER, Bull. Ill. State Lab. N. H., VII, p. 104, 1906. 
SHELL: Small, ventricose, inflated, rather solid; periostracum 
greenish-horn or olivaceous; surface shining, growth lines crowded, 
very distinct, crossed by fine impressed spiral lines; nuclear whorls 
roundly inflated, light or dark horn colored similar in outline to those 
of jacksonensis ; whorls 4-414, convex, tumid, the body whorl very large, 
occupying more than two-thirds the length of the shell; spire generally 
much depressed, globose; sutures well impressed; aperture very large, 
long-ovate to roundly ovate, broadly rounded below, angulated above, 
occupying about two-thirds the total length of the shell; it is some- 
times shouldered ; outer lip thickened within by a heavy longitudinal va- 
rix ; inner lip rather wide, with parallel margins, spreading over the um- 
bilicus which it slightly emargins and forming a wide, flattened ex- 
pansion ; an umbilical chink is usually present ; the callus on the parietal 
wall is thick and heavy and is the same width as the inner lip; in 
some specimens the columella is thickened in the middle forming a 
distinct tubercle; a columellar plait is not developed, but the axis, 
especially in the upper whorls, is distinctly twisted. 
Length. Width. Aperture length. Width. 
11.80 8.50 8.50 5.50 mill. Type. 
10.50 7.25 8.50 zr hae : 
10.50 7.00 8.00 5.00.“ # 
9.00 5.25 6.00 3.50 “ Millers. 
9.50 6.00 6.75 3.50 “ 5 
13.75 8.00 9.50 4.50.“ - (Chitage: 
11.50 7.50 8.25 405 * ae 
Types: Five specimens, Chicago Academy of Sciences, 23789 
and 3425. 
Type Locauity: Lake Michigan, Oak Street, Chicago, [linois. 
ANIMAL, JAW, RApuLA and GENITALIA: Unknown. 
