448 THE CHICAGO ACADEMY OF SCIENCES. 
the St. Lawrence River were all founded on specimens of catascopium 
(pinguis) a fact ascertained by an examination of some of the original 
specimens kindly sent to the writer by Dr. Whiteaves. A single speci- 
men was detected among the shells collected by Mr. J. Macoun in the 
St. Lawrence River below the mouth of the Montmorency River, 
which was almost identical with the Lake Superior shells. As this 
may have been a case of parallel development in catascopium (to which 
species all of the other specimens belong) and in the absence of addi- 
tional material it can scarcely be referred to apicina. 
Galba apicina solida Lea. Plate XLVIII, figure 2; plate 
XLVII, figure 30. 
Limnea solida Lea, Trans. Amer. Phil. Soc., VI, p. 94, pl. 23, fig. 91, 1839; 
Obs., II, p. 94, pl. 23, fig. 91, 1889—Wueattey, Sh. U. S., p. 24, 1845 —Jay, 
Cat. Ed. 4, p. 270, 1852—Scupper, Bull. Nat. Mus., 23, pp. 20, 201, 1885. 
Limnea solida Hatp., Mon. Limn., p. 36, pl. 11, figs. 11, 13, 1842. 
Limnea solida DeKay, Zool. N. Y., p. 75, 1843—Binney, Check List., p. 
12, 1860.—Crr., Rep. Brit. Assoc., p. 674, 1864—BinneEy, L. & F. W. Sh. N. A, 
II, p. 62, fig. 97, 1865.—Cpr., Smith. Misc. Coll. p. 160, 1872—Sows., Conch. 
Icon., XVIII, Lim., sp. 88, pl. 13, figs. 88 a, b, 1872—Tryon, Con. Hald. Mon., 
p. 111 (85), 1872—CreEssin, Mal. Blatt., n. s., III, p. 82, 1881. 
Limnophysa solida Tryon, Amer. Journ. Conch., I, p. 256, 1865. 
Limneus solidus TroscHer, Archiv. fur Natur., II, p. 224, 1839. 
Limnea bulimoides var. solida Cooper, Proc. Cal. Acad. Sci. IV, p. 96, 
1870. 
SHELL: Acutely conic or elongate-ovate, very solid, periostracum 
pale horn varying to whitish; surface shining, presenting a polished 
appearance; lines of growth coarse and close-set, spiral striation 
marked; nuclear whorls as in apicina; whorls 4 to 5, rather rapidly 
increasing in size, body whorl somewhat flatly rounded ; spire elongated, 
acutely conic; sutures impressed; aperture ovate, somewhat expanded, 
particularly at the anterior end; the aperture is about half the length 
of the shell; outer lip thickened with an internal, longitudinal varix ; 
inner lip broadly reflected, completely closing the umbilicus, and form- 
ing a broad, flat expansion; parietal callus very thick and spreading 
over the parietal wall; axis slightly twisted, forming a distinct but not 
sharp plait. 
Length. Width. Aperture length. Width. 
11.25 7.00 6.00 3.25 mill. Type. 
13.00 8.00 8.00 De a Salmon River, Idaho. 
12.00 (0) 7.00 Z EEX) os % cs 
Type: One specimen, Smithsonian Institution, No. 118713. 
Type Locarity: Willamette (Wahlamat) near its junction with 
the Columbia River, Oregon. 
