452 THE CHICAGO ACADEMY OF SCIENCES. 
terial has been included in preblei which Dr. Dall places in binneyi, 
evidently from a misconception of the true binneyi. Binney (p. 31) 
has confused this species with Galba emarginata mighelsi. An examin- 
ation of the axis of both species shows them to be true Stagnicolas 
and not rightly placed in Radix which has a distinctly gyrate axis. 
Preblei will doubtless be found to be a common species in the waters 
draining into Hudson Bay. 
Galba randolphi (Baker). Plate X VIII, figure 6; ats XLV HI, 
figures 5-12; plate XLVI, figure 13. 
Limnea ae RanpoLrPH, Nautilus, XII, p. 110, 1899. 
Limnea emarginata var. mighelsi BAKER, Bull. Chi. Acad. Sci. II, No. 4, 
pp. 196, 198, 1900 (not of Binney). 
Lymnea randolphi BAKER, Nautilus, XVIII, p. 63, Oct., 1904. 
Lymnea (Radix) randolphi Dati, Alaska Moll., p. 71, pl. 1, figs. 3, 4, 1905. 
Limnea randolphi Wuiteaves, Ottawa Naturalist, XIX, p. 65, 1905; Nauti- 
lus, XIX, p. 3, 1905. 
SHELL: Large, thin, more or less inflated; whorls 5, inflated, dis- 
tinctly angulated at the shoulder and constricted at the suture, fre- 
quently decollated ; spire short, occupying less than half the length of 
the shell; in some specimens the first three and one-half whorls are 
small and regularly wound, and the last whorl abruptly enlarges to 
more than four times the diameter of the preceding whorls, sometimes 
causing the upper spire whorls to appear as though set upon a ped- 
estal; nuclear whorls 114 in number, the first part of the whorl is 
rounded and very small, the second very large, rounded; the nuclear 
whorls are very rough, with a satin finish sculpture; in certain lights 
there seem to be very fine spiral striations; (pl. XLIX, fig. Q); 
sutures deeply impressed, the whorls constricted near this region ; sculp- 
ture consisting of close-set, regular lines of growth crossed by fine, 
impressed spiral lines; the surface is strongly malleated in many 
specimens and in some individuals raised spiral ridges are formed on 
the body-whorl; aperture very large, ovate, narrowed at the posterior 
end_by the sutural constriction; the anterior end of the aperture is 
rounded and much produced; the aperture is made continuous by the 
elevation of the inner lip which is more or less reflected, thin and 
sharp; outer lip very thin, a trifle patulous in many specimens; in 
some specimens the inner lip is appressed to the body whorl while in 
others it scarcely touches it joining the outer lip at a sharp angle; 
pillar with a twisted axis, sometimes slightly sinuous; umbilical chink 
deep, rather widely open in some specimens; color pale horny, with 
sometimes a dark line at resting stages, dead specimens become chalky 
white. 
