LYMN2Z:IDA OF NORTH AMERICA. 441 
Limnea ampla? Tryon, Con. Hald. Mon., p. 91, pl. 16, fig. 10, 1872 (non 
Mighels )—Cat. Coll. Nat. Hist. Eth. Prov. Mus. Victoria, p. 95, 1898. 
Limnea randolphi? Dati, Alaska Moll., p. 71, 1905. 
SHELL: Elongate-globose, inflated, generally rather solid; perios- 
tracum pale horn, darker in some specimens; surface shining, lines of 
growth coarse and close-set; spiral striation pronounced; apex wine 
colored; whorls 4% to 5, rapidly increasing in size, inflated, tumid; 
spire short, broadly conic; nuclear whorls 114 in number, flattened, 
especially the first whorl which is very flat, sunken in the volution of 
the second whorl, and separated by a deep sutural channel (pl. XLIX, 
fig. P) ; sutures impressed ; aperture ovate or elliptical, occupying more 
than half the length of the shell; outer lip convex, thickened within by 
a varix edged with brown; inner lip somewhat erect, reflected over 
the parietal wall to form a thick callus and raised above the umbilicus 
forming a broad, flat projection partly hiding the umbilical chink; axis 
not much twisted, but the columella is slightly thickened and in some 
specimens the inner lip is appressed to such an extent as to form a 
rather well-marked plait; the umbilical chink varies from a small slit 
to a rather wide opening. The surface is sometimes malleated. 
Length. Breadth. Aperture length. Breadth. 
19.00 12.00 12.25 6.25 mill. Tryon’s type. 
18.25 11.50 11.50 550) ie aS of 
20.50 12.20 12.60 7.00 “ Lake Superior. 
28.00 18.00 17.50 10.10) * a iy 
22.50 12.75 " 13.50 TeDOG tes “ 
19.50 13.25 12.50 Sal Oley ms 
19.75 11.50 10.50 7.50 
16.00 9.30 9.80 5.50 
17.00 10.00 10.00 5.50 
22.75 13.00 13.00 7.50 
29.00 19.50 19.50 11.50 “ Rainy Lake. 
25.00 16.50 19.50 SOs 3 re 
Types: Two specimens, ex Gabb., Acad. Nat. Sci., Phil., No. 
58506. 
Type Locarity: Hell Gate River, Montana. 
ANIMAL, JAW, RADULA and GENITALIA: Not examined. 
RANGE: (Figure 49). Western Ontario north of Lake Superior 
(86°) west to Washington, Alberta south to southern Idaho. Binneyi 
is a species of the Boreal (Canadian) and Transition life zones. It 
occupies both the Great Lakes drainage and that of the streams empty- 
ing into the Columbia River (Columbian and Canadian regions). There 
seems to be no question concerning the identity of the shells occupying 
these very diverse drainage areas. Specimens from Montana and 
Yellowstone Park indicate that the species occupies the upper drain- 
