Preliminary Deseriptions of New Speeies of Mollusks from 
thè Northwest Coast of America. 
[From thè Proceedings of (he California Academy of Scie^iceSt printed in advance^ Oct. 8, 1872.] 
Voluta {Scaphella) Stearnsii, Dall. Sbell large, slender, spindle-sbaped, mod- 
erately thick, Color, livid purple, more or less obscured by an asby-white 
outer layer, more conspicuous near thè sutures and on thè callosity of thè inner 
lip. Exterior, smooth (but not polished) except for thè strong linee of in- 
crease. Suturee appressed ; siphonal fasciole strong. Nucleus small, white, 
mammillated. Aperture more than half as long as thè shell, white and livid 
purple, with a dash of brighter purple at thè posterior notch and on thè an- 
terior portion of thè callus. Edge white, callus reflected, thick and strong, 
with a chink behind thè anterior portion. Canal twisted to thè right, moder- 
ately deep. Whorls 6-8 ; long. 4.13 in., lat. 1.62 in., long, apert. 2.59 in. ; 
dell. 40^. Living, from stomach of cod, Shumagin Islands. Dead on beach ; 
Culi rocks Akutan Pass, and west side of Amaknak Islaud, Captain’s Bay, 
Unalashka. 
Nacella (?) rosea, Dall. Shell small, egg-ovate, of a deep rose color, extern- 
ally smooth, except for very faint radiating ridges divaricating from thè apex, 
and for lines of growth. Margin entire ; apex minute, produced before thè an- 
terior margin. Interior smooth, white, except thè margins, which are polished 
and of thè same color as thè exterior. Nacre, especially when weathered, sil- 
very. Long. -35 in., lat. -27 in., alt. '12 in. of largest specimen. 
Dead on beach, east side of Simeonofif Island, Shuraagins. Living, proba- 
bly on faci — off shore. 
This, from its appearance, is probablly a trae Nacella, congeneric with thè 
Cape Horn speeies, and thè first described from thè northern hemisphere. Its 
occurence with that of several other mollusks in thè Aleutian fauna is remark- 
able ; and thè faets, on forther inspection, bave developed a considerable resem- 
blance between these antipodal faunae. 
Littorina aleutica, Dall. Shell depressed, whorls four, thè nucleus including 
one and a half. Last whorl much thè largest ; spire depressed or nearly flat- 
tened. Color variable, from dark brown or purple to waxen white, or banded 
with white on a darker ground. Nucleus polished, dark brown, translucent. 
Sculpture consisting of rather coarse lines of growth, and about six or eight 
