"O. testa ovali, griseo-fulvescente, longitudinaliter substriata, laevi; spira subacuminata, sutura subfusca; columella laevi, superne callosa, ad basim biplicata; apertura, columellae basi, cinguloque basali violaceo tinctis; long. 1 lat. 6/10 unc. A pretty little Olive, of a very regular oval form, from the west coast of North America; its smooth columella, callous at the upper part, and having two small folds at the base, is its principal characteristic mark.". Recent. West coast of North America.