LYMNZID& OF NORTH AMERICA. | 453 
Length. Breadth. Aperture length. Breadth. 
29.50 20.00 19.00 12.00 mill. 5 whorls. 
35.00 27.00 21.00 12.50 “ Spire broken. 
32.00 20.00 20.00 12.00 “ 4 whorls. 
31.00 ~ 19.00 18.00 11.00 “ ~- Dall, 3%4 whorls. 
41.00 23.00 24.00 15.50 “ ae: : 
35.00 27.00 24.00 15-60,. *¢ Al S 
16.00 10.00 9.50 6.00 “  (Juvenile.) 
13.00 7.50 7.50 4:10,“ ss 
Types: Chicago Academy of Sciences, one specimen, No. 23089; 
four specimens, No. 23090. Cotypes in Academy of Natural Sciences 
of Philadelphia, No. 88434. 
Type Locatity: Marsh Lake, near Dyea Valley, Yukon Terri- 
tory. 
ANIMAL, JAW, RADULA and GENITALIA: Unknown. 
RANGE: (Figure 51). British Columbia north to Northern Alas- 
ka. Randolphi is a species of the Boreal life zone including the Arctic, 
Hudsonian and Canadian divisions. It is at present known from the 
drainage areas of the Yukon and Fraser rivers, which places it in 
the Alaskan, Yukonian and Columbian regions. 
RECORDS. 
ALASKA AND BritisH AMERICA. 
ALAsKA: Nushagak River, lat. 59° N., long. 159° west (Arnheim) ; Kowak 
River (Dall; Stoney); lake near Cosmos River, north of the Kowak River, 
about lat. 68° N. (Smith. Inst.) ; Alitah Lake, Alaska Peninsula (U. S. Fish 
Com.). 
BritisH CotumsBiA: Lake La Hoche, Lillooet Dist. (Dall). 
Yukon: Marsh Lake, near Dyea Valley; Lake Lindeman (Randolph) ; 
Francis Lake; Finleyson Lake; Lewes River (Whiteaves). 
GroLocicaL DistripuTION: Unknown. 
Ecotocy: In Marsh Lake (Randolph). The records show that 
this species is confined principally to lakes. Its habitat relations would 
seem to resemble those of Galba emarginata. 
ReMArKS: This is a very distinct species, not easily confounded 
with any other. It has a superficial resemblance to some forms of 
Galba emarginata mighelsi (Binney), but the angularity of the whorls, 
the constriction of the suture, the acute spire and the deep umbilical 
chink easily separates it from that species. From binneyi Tryon it 
differs in its angular whorls, constricted sutures and differently shaped 
aperture. In fully adult specimens the inner lip becomes very broad 
and erect and completely covers the axis, thereby obscuring the char- 
acteristic twist of the columella; but in young specimens the axis is 
