LYMN.EHXE OF NORTH AMERICA. 443 



Binneyi varies greatly in size as well as in the tumid character of 

 the whorls. The majority of the specimens are uniform in size and do 

 not vary markedly from Tryon's types, in the Philadelphia Academy 

 of Natural Sciences. In the lot from Lake Superior, however, there 

 .are several individuals which are double the normal size, one speci- 

 men having a large patulous aperture (pi. XLVII, fig. 17). The spire 

 also varies somewhat in height. The umbilical chink is usually (and 

 normally) rather large and deep and is overhung or emargined by the 

 inner lip somewhat as in emarginata. Occasionally a specimen occurs 

 in which the inner lip is so closely applied to the parietal wall as to 

 nearly or quite close the umbilicus and form a conspicuous plait (pi. 

 XLVII, fig. 17). The aperture varies from ovate to elliptical. Some 

 specimens from Rainy Lake, Ontario, have a large aperture and a very 

 short, broad spire. The majority of specimens from this locality are 

 quite normal. Specimens from Lake Louise, near Banff, are narrower 

 than typical binneyi, but are otherwise similar (plate XLVI, figures 9- 

 11). An examination of the axis of this species shows that it is not 

 gyrate nor particularly twisted, excepting in abnormal specimens, and 

 it cannot therefore, be correctly placed in the section Radix '. 



The Lake Superior lot of binneyi is in all respects like Tryon's 

 types from Hell Gate River, Montana, thus extending the range of 

 this species many miles eastward. The western references to emar- 

 ginata undoubtedly refer to this species as emarginata does not occur 

 west of the Rocky Mountains, binneyi replacing it. A specimen labeled 

 emarginata in the Smithsonian collection (from Sawtooth Lake, Idaho) 

 proved, upon examination, to be typical binneyi (pi. XLVI, fig. 12). 

 Figure 15, on plate XLVII, is almost identical with Tryon's type as 

 well as his figure. The specimen figured by Binney on page 43 (1. c.) 

 is probably a scalariform individual of binneyi and not referable to 

 randolphi. Specimens from the same lot examined recently are all re- 

 ferable to binneyi. 



Galba apicina Lea. Plate XLVII, figures 19-29 ; plate XLVIII, 

 figure 1. 



Lymncea apicina LEA, Trans. Amer. Phil. Soc., VI, p. 102, pi. 23, fig. 94, 

 1839; Obs., II, p. 102, 1839. WHEATLEY, Sh. U. S., p. 23, 1845. SCUDDER, Bull. 

 Nat. Mus., 23, pp. 20, 200, 1885. 



Limnea apicina GOULD, Wilke's Exped., p. 122, 1852. 



Limn&a apicina CPR V Rep. Brit. Assoc., pp. 210, 216, 1856. BINNEY, Check 

 List, p. 12, 1860; L. & F.-W. Sh. N. A., II, p. 62, fig. 98, 1865. 



Limnaas apicinus TROSCHEL, Archiv. fur Natur., II, p. 224, 1839. KUSTER, 

 Conch. Cab., p. 48, taf. 8, figs. 31-33, 1862. 



