152 THE CHICAGO ACADEMY OF SCIENCES. 
Lymnea stagnalis wasatchensis ({lemphill). Ms. Plate XX, 
figures 10-12. 
SHELL: Much elongated, narrow, thin; color light yellowish horn; 
surface with the characteristic sculpture of stagnalis; whorls 6% flatly 
rounded, increasing slowly in size; last whorl small, generally not in- 
flated, but well rounded; spire very long, acutely pointed, occupying 
more than half the length of the shell; sutures well marked, aperture 
small, roundly ovate; inner lip appressed tightly to the parietal wall 
and to the columellar region; there is no umbilical chink; axis with 
a strong plait as in stagnalis appressa. 
Length. Breadth. Aperture length. Breadth. 
42.00 17.00 19.00 12.00 mill. 
38.00 16.00 17.50 HE OON Ss 
32.50 14.00 15.00 9°50) 
37.00 18.00 19.00 12:00) = 
45.00 20.00 22.00 135000 
Type: Coll. Henry Hemphill. 
Type Locatity: Near Salt Lake, Utah. 
ANIMAL, JAW, RADULA and GENITALIA: Unknown. 
RANGE: (Figure 11) Western and Northwestern America. 
RECORDS. 
The records give a peculiar distribution for this species, showing 
an area of about 1500 miles between the most northern record and 
that from Alberta. The northern record seems authentic, the speci- 
mens agreeing well with wasatchensis. The race probably inhabits 
most of the region north of the 40th parallel and west of the 110th 
meridian. 
UNITED STATES. 
Uran: Near Salt Lake; near Logan, Cache Co. (Hemphill) ; Pangeritch 
Lake, 25 miles north of Salt Lake, Tooele Co. (Wheeler expedition, Phil Acad.). 
WasHINGTON: Near Spokane Falls, Spokane Co. (Button); East of Col- 
ville (Smithsonian coll.). 
BRITISH AMERICA. 
ALBERTA: Devil’s Lake, near Banff (Woodruff). 
MAcKENZIE: Near Fort Anderson, N. lat. 68° (McFarland). 
GEOLOGICAL RANGE: Unknown. 
Ecotocy: No records have been seen detailing the habitat rela- 
tions of this race. 
Remarks: Wasatchensis appears to be a strongly marked race of 
stagnalis. Its chief characteristics are its long tapering spire, its 
roundly ovate aperture and the general rotundity of the last whorl. 
It may be at once distinguished from appressa by its more rounded 
aperture and last whorl, appressa having more flat sided whorls. This 
