440 THE CHICAGO ACADEMY OF SCIENCES. 
REMARKS: Oronensis is easily known by its rounded whorls, 
very globose form, imperforate axis, roundly ovate aperture and 
strongly plicate columella. It differs from catascopium in its broad 
shell, tumid, globose whorls, depressed spire and roundly ovate aper- 
ture. The columellar plait is also heavier than in catascopium and the 
inner lip is broader. It is more nearly related to emarginata but may 
be distinguished by the imperforate axis and plicate columella. It re- 
sembles some forms of emarginata canadensis, which race, however, 
has a more acute spire, a less globose body whorl and a wider and 
less plicate columella. The species does not seem to be closely related 
to either catascopium or emarginata though having affinities with both, 
standing nearer to emarginata, however, a fact shown by the wider in- 
ner lip and evidences of emargination in some individuals. Normal 
specimens from Caribou River, Maine, cannot be separated from the 
types of oronensis, excepting by their lighter color. The immature 
Caribou River specimens resemble juvenile specimens of emarginata 
mighelsi Binney, but are more solid and have a less number of whorls. 
They were referred to emarginata by Nylander, but are more cor- 
rectly placed in oronensis. Young specimens somewhat resemble Galba 
apicina and specimens from Ottawa, Canada, have been so identified. 
It may be known from that species by its less rotund body whorl, 
imperforate axis and very acute columellar plait which is placed on a 
narrower inner lip. Oronensis will probably be found in collections 
under the names of catascopiwm and emarginata. 
Galba binneyi (Tryon). Plate XLVI, figures 9-12; plate 
XLVII, figures 11-18; plate XLVIII, figure 3. 
Limnea binneyi Tryon, Amer. Journ. Conch., I, p. 229, pl. 23, fig. 3, 1865.— 
CurriER, Kent. Sci. Inst., Mis. Pub. No. 1, 1868.—Cooper, Proc. Cal. Acad. Sci., 
IV, p. 96, 1870.—INGeErsoLL, Bull. U. S. Geog. & Geol. Surv. I, p. 139, 1875; Rep. 
U. S. Geol. & Geog. Surv. Terr., 1874, p. 406, 1876. 
Limnophysa binneyi Tryon, Amer. Journ. Conch., I, p. 252, 1865.—Cooprr, 
Proc. Cal. Acad. Sci., IV, p. 173, 1872; Proc. Cal. Acad. Sci., VI, p. 26, 1875. 
Limnophysa caperata var. binneyi, KEEP, West Coast Shells, p. 122, 1887. 
Limnea ampla Tryon, Con. Hald. Mon., p. 91, pl. 16, fig. 9, 1872 (exparte, 
non Mighels). 
Lymnea (Radix) binneyi Datt, Alaska Moll., p. 69, 1905. 
Limnea catascopium Goutp, Agassiz’s Lake Superior, p. 244, 1850 (part). 
Limnea palustris STEARNS, Proc. U. S. Nat. Mus., XIV, p. 101, 1891 (part). 
Lymn@a emarginata Cooper, Pac. R. R. Rep., XII, pt. 2, p. 278, 1860. 
Limnea emarginata Cprr., Rep. British Asso., pp. 599, 674, 1864——Smith. 
Mis. Coll., X, pp. 85, 160, 1872. 
Limnea sumassi? Binney, L. & F.-W. Sh. N. A., II, p. 43, fig. 58, 1865 
(non Baird). 
