Alcadia brownii is a species of an operculate land snail, terrestrial gastropod mollusk in the family Helicinidae.
(Original description) The pale brown shell is depressed ovate with a smooth and translucent surface. It is convex above and rather convex beneath. The peristome is thickened and reflected, with a white coloration. Both the columella and the inner lip are whitish and slightly thickened. The front part of the aperture near the columellar angle features a spirally curved slit. The operculum is horny and has a process that fits into the slit.
This species occurs on Jamaica and The Bahamas