GASTEROPODA. 37 
Aug. 1846. Expedition Shells, 18. Briyney; Land Mollusks of United 
States, ii. 210. Premrer; Monog. Helic. Viv., i. 121. 
Suet orbicular, slightly and about equally convex above and be- 
neath, broadly umbilicated, surface irregular, and roughened above 
by indentations and coarse lines of growth, and by occasional fine 
revolving lines; smooth and shining beneath. Colour ashy-gray, 
“somewhat mottled with dusky or altogether rusty-brown above, with 
usually a single faint revolving band on the middle of each whorl, and 
often with numerous bands unequal in size and distance beneath. 
Whorls five, separated by a well-defined suture, moderately convex, 
carinated at its commencement and deflexed near the aperture, which 
is circular, with the lip simple, and very nearly continuous. 
Diameter nine-tenths of an inch; axis two-fifths of an inch. 
Inhabits along Puget Sound, Pickering ; Columbia River, Drayton. 
In form it may be compared, among the shells of this continent, to 
H. concava, and H. alternata ; but in its opaque and rugged aspect, and 
in most of its characters, it nearly resembles some of the varieties of 
H. alpina, of Europe (H. Schmidtii, H. tigrina), but that species is 
more elevated, has the umbilicus smaller, the tip reflexed, and no 
revolving bands. 
Figures 41, 41 a, 41 0, three views of the shell. 
HELIX sPORTELLA (Gould). 
Testa planulata, fragilis, nitida, luteo-cornea, subtus concava, late um- 
bilicata, lineis incrementi conspicuis et linets volventibus subtilissimis 
confertim decussata ; anfractibus quinque, ultimo magno ; suturd pro- 
funda: apertura rotundata, infra subangulata ; labro acuto, simplict. 
Helix sportella, Gov. ; Proceed. Boston Soc. Nat. Hist., 1. 167. 
Aug. 1846. Expedition Shells, 18. Preirrer; Monog. Helic., i. 111. 
SHELL much depressed, convex above, concave beneath, sloping 
into a broad, tunnel-shaped umbilicus, delicate and shining, of a light, 
10 
