344 THE CHICAGO ACADEMY OF SCIENCES. 
Limnea zebra Tryon, Amer. Journ. Conch., I, p. 228, pl. 23, fig. 4, 1865; 
Amer. Journ. Conch., III, p. 196, 1867—Curriger, Kent. Sci. Inst., Mis. Pub., 
No. 1, 1868.—Tryon, Con. Hald. Mon., p. 94 (68), pl. 16, fig. 14, 1872 —CALKINs, 
Cin. Quart. Journ. Sci., 1, p. 243, 1874; Cin. Quart. Journ. Sci., 1, p. 323, 1874.— 
Tryon, Home & Science Gossip, June 15, 1881—Marsu., Conch. Exch., II, p. 
104, 1887 —Snyper, The Museum, III, p. 12, 1896. 
Limnophysa zebra Currier, Amer. Journ. Conch., I, p. 294, 1865.—Tryon, 
Amer. Journ. Conch., I, pp. 68, 70, 250, 1865——Cati, Bull. Wash. Coll. Lab. 
N. H., I, p. 53, 1885.—Keryes, Bull. Essex Inst., XX, p. 70, 1888. 
Limnea reflexa var. zebra WiTTER, Quart. Journ. Conch., I, p. 386, 1878.— 
Wacker, Journ. Conch., II, p. 330, 1879. 
Limnophysa reflexa var. zebra DECAmp, Kent. Sci. Inst., Mis. Pub., No. 5, 
p. 8, 1881. 
Limnea reflexa zebra WALKER, Nautilus, VI, p. 32, 1892; Rev. Moll. Mich., 
p. 7, 1894.—SARGENT, Nautilus, IX, p. 127, 1896. 
SHELL: Elongated, attenuated, thin; periostracum light corneous 
or honey-yellow, sometimes streaked zebra-like ; surface dull to shining, 
growth lines distinct, crowded, crossed by numerous very fine incre- 
mental striz; nuclear whorls 1%, small, similar to those of palustris 
in outline, light corneous to very dark brown in color; whorls six to 
seven, very flat-sided, the last a little over one-third the length of the 
entire shell; spire long and very acutely attenuated, forming an almost 
unbroken, acute triangle in typical specimens; sutures impressed, fre- 
quently margined below by a white band edged with chestnut ; aperture 
elongate-ovate, narrow, oblique, slightly contracted at the upper part; 
rounded at the lower part; peristome sharp, thin, a rather heavy callus 
within which is dark chestnut colored, the remainder of the aperture be- 
ing brownish or horn color; this color shows on the outside as a light 
band in many specimens ; inner lip very narrow, erect, reflected over the 
umbilicus, completely closing it; the callus on the parietal wall is well 
marked and is so heavy in some specimens, especially when slightly 
raised, as to render the aperture continuous ; the axis is slightly twisted, 
frequently somewhat gyrate. 

Length. Width. Aperture length. Width. 
37.00 11.50 14.00 6.25 mill. Type exilis. 
37.00 11.00 14.00 G:000 = Chicago. 
28.00 9.50 12.00 4.50 “ Type zebra. 
30.00 9.00 13.00 5.00 “ Chicago. 
24.00 7.50 10.50 AND cs 
28.50 7.50 11.50 4°50) = sf 
28.00 7.50 11.00 (000 Mercer Co., II. 
33.00 9.50 12.50 5.50 “ Winnebago Co., Ill. 
36.50 10.00 15.00 G0 a i oS 
28.00 9.00 13.00 5.50 “ Antrim Co., Mich. 
39.00 11.00 16.00 6.00 “ Minneapolis, Minn. 
30.10 9.10 12.10 A OOmees Poland, Ohio. 
