440 THE CHICAGO ACADEMY OF SCIENCES. 



REMARKS: Oronensis is easily known by its rounded whorls, 

 very globose form, imperf orate 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 catascopium and emarginata. 



Galba binneyi (Tryon). Plate XLVI, figures 9-12; plate 

 XLVII, figures 11-18; plate XLVIII, figure 3. 



Limnaa binneyi TRYON, Amer. Journ. Conch., I, p. 229, pi. 23, fig. 3, 1865. 

 CURRIER, Kent. Sci. Inst, Mis. Pub. No. 1, 1868. COOPER, Proc. Cal. Acad. Sci,, 

 IV, p. 96, 1870 INGERSOLL, 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. COOPER, 

 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. 



Limncea ampla TRYON, Con. Hald. Mon., p. 91, pi. 16, fig. 9, 1872 (exparte, 

 non Mighels). 



Lymnaa (Radix} binneyi BALL, Alaska Moll., p. 69, 1905. 



Limnea catascopium GOULD, Agassiz's Lake Superior, p. 244, 1850 (part). 



Limnaa palustris STEARNS, Proc. U. S. Nat. Mus., XIV, p. 101, 1891 (part). 



Lymnaa emarginata COOPER, Pac. R. R. Rep., XII, pt. 2, p. 278, 1860. 



Limnaa emarginata CPR., Rep. British Asso., pp. 599, 674, 1864. Smith. 

 Mis. Coll., X, pp. 85, 160, 1872. 



Limnaa sumassi? BINNEY, L. & F.-W. Sh. N. A., II, p. 43, fig. 58, 1865 

 (non Baird). 



