160 NEW UNIONID^, MELANIDiE, ETC., 



Lymistea proxima. pi. 24, fig. 74. 



Testa acuto-conica, subtenui, crebre et irregulariter striata, cornea, minute perforata ; spira subelevata, ad 

 apicem acuminata ; suturis valde impressis ; aafractibus septenis, convexis ; apertura subinflata, sub- 

 elliptica, intus fasciata ; columella paulo plicata. ^ 



Shell acutely coaical, rather thin, closely and irregularly striate, horn-colored, 

 slightly perforate ; spire rather elevated, pointed at the apex ; sutures very much 

 impressed ; whorls seven, convex ; aperture rather inflated, nearly elliptical, banded 

 within ; columella slightly folded. 



Proc. Acad. Nat. Sci., 1856, p. 80. 



Hab. — Arroya San Antonio, Marin County, California, Dr. Trask. 



My cabinet and cabinet of Dr. Trask. 

 Diam. "30, Length -TG inch. 



Remarlcs. — This species is near to Nuttalliana, Lea, and reflexa, Say. It is less 

 inflated than the former and less attenuate than the latter. The brown band within 

 the outer lip is narrower than in Nuttalliana, and there is no thickening as in reflexa. 

 Nearly all the specimens were covered with a deposit of the peroxide of iron, and 

 therefore are quite black. The lip is not reflexed. 



Lymnea arctica. pi. 24, fig. 75. 



Testa elliptica, subinflata, subcrassa, imperforata, minute striata, dilute cornea ; spira obtusa ; suturis im- 

 pressis; anfractib us convexis ; apertura lato-elliptica, gubgrandi; labro regulariter expanso; columella 

 medio incrassata et magna plica induta. 



Shell elliptical, somewhat inflated, rather thick, not umbilicate, minutely striate, 

 pale horn-color ; spire obtuse ; sutures impressed ; whorls convex ; aperture broadly 

 elliptical, rather large; outer lip regularly expanded; columella thickened in the 

 middle and furnished with a large fold. ^ 



Proc. Acad. Nat. Sci., 1864, p. 113. 



Eah. — Moose Eiver, of Hudson's Bay, Arctic America, Smithsonian Institution. 



Cabinet of the Smithsonian Institution, Washington. 

 Diam. -24, Length -45 ? inch. 



Remarlcs. — I found a single imperfect specimen among some odd valves of U/iiones 

 sent to me by the Smithsonian Institution for examination. The apex is broken and 

 only two and a half of the lower whorls are left. It probably had five. It is a very 

 distinct species with very regular oval whorls, and an uncommonly large fold bent 

 round the middle of the columella. The expansion of this fold covers the small umbili- 

 cus, rendering it imperforate. It difiers from Pingelii, Beck, from Greenland, as well 

 also from imlustris of Northern Europe. It is allied to caperata, Say. The aperture 

 is nearly two-thirds the length of the shell. 



