444 THE CHICAGO ACADEMY OF SCIENCES. 
Limnea bulimoides var. apicina Coorrr, Proc. Cal. Acad. Sci. IV, p. 96, 
1870. 
Limnea catascopium Havp., Mon. Limn., p. 8, pl. 1, fig. 9, 1842; Mon. Lim., 
p. 52, pl. 14, fig. 5, 1842. 
Limnea catascopium? Binney, L. & F.-W. Sh. N. A., II, p. 56, fig. 86, 
1865. 
Lymnea catascopum Baker, Trans. Acad. Sci. St. Louis, XVI, p. 13, 1906. 
Limnea decollata Binney, L. & F.-W. Sh. N. A., II, p. 32, 1865 (part).— 
CurrteER, Kent. Sci. Inst., Mis. Pub., No. 1, 1865—Dawson, British N. A. Bound. 
Com., p. 349, 1875 —W2ALKER, Journ. Conch., II, p. 330, 1879——Curisty, Journ. 
Conch., IV, p. 347, 1885——WaALkErR, Nautilus, VI, p. 32, 1892; Rev. Moll. Mich., 
1894, p. 17—HaAnuHAM, Nautilus, XIII, p. 5, 1899 (?)—RutTHvEN, Rep. Mich. 
Acad. Sci., VI, p. 190, 1904; Rep. Geol. Surv. Mich., 1905, pp. 23, 24, 35, 95, 
1906. 
Radix decollata DECAmp, Kent. Sci. Inst., Mis. Pub., No. 5, p. 7, 1881. 
Limnea brownit Tryon, Amer. Journ. Conch., III, p. 196, 1867 (part). 
Limnea solida Tryon, Con. Hald. Mon., pp. 107 (81), 111 (85), 1872. 
Limnea solida Hatp., Mon. Limn., p. 38, pl. 11, fig. 12, 1842. 
SHELL: Globose or ovate, inflated, generally rather solid; perios- 
tracum pale horn, darker in some specimens; surface shining, almost 
polished, lines of growth coarse and close-set, spiral striation pro- 
nounced; nuclear whorls wine-colored, in outline resembling those of 
binneyt; whorls 4-5, rapidly increasing in size, inflated, tumid; spire 
short, generally very broad, dome-shaped, frequently much depressed ; 
sutures impressed, frequently bordered by a white band; aperture ovate 
or roundly ovate, occupying usually more than half the length of the 
shell; outer lip very convex, with an internal transverse varix, edged 
with brown; inner lip triangular, rather narrow, tightly appressed to 
the umbilical region, leaving a very small chink; parietal callus very 
thin ; axis twisted forming a distinct ascending plait. 
Length. Width. Aperture length. Width. 
10.25 7.25 6.25 3.50 mill. Type apicina. 
9.50 7.00 6.50 SOOM ees: ns my 
12.00 9.00 8.50 4.50 “ Lake Superior. 
12.80 10.00 9.00 BOO | as * 
* 15.00 9.00 9.00 5.00 © a * 
16.25 10.25 10.50 iyar(aye na 
15.50 11.00 10.50 6.50 “ 2 se 
12.50 9.00 8.50 5.00 “ Union River, Mich. 
14.00 10.00 9.00 550) tr Menominee River, Mich. 
14.00 10.50 9.50 £00) % sf ot 
15.50 12.25 11.00 Goi aes Iron Co., Mich. 
16.00 11.10 10.00 6.25 “ Twin Falls, Mich. 
18.50 14.00 13.00 lO wo 4 # e 
18.00 11.00 10.00 5.50)... 4 COrecon.) 
15.00 11.00 eae set ace (Lake of the Woods, Daw- 
son. ) 
