Shell small, lustrous, narrow, widest a little below the middle; spire elevated, apex acute, whorls about 6,5; suture very narrowly channeled and overhung by the sharp! edge of the whorl below. Aperture about half as high as the shell, narrow, triangular, terminating below in the very short squarish canal; outer lip thin; parietal callus moderate, thickest near the end of the suture but thinning out before quite attaining the suture above; columella moderately concave within, its lower portion armed with a narrow raised plate bearing 5 or 6 low entering folds. Fasciole smooth, wide. Color whitish, maculated with light and dark brown, which often forms a more or less continuous band below the suture. Alt. of holotype 9.6, max. diam. 3.5, alt. aperture 5.3 mm. Type Locality: Cholla Cove, Bahia de Adair, Sonora, Mexico: S. S. Berry, Mar. 1948 and subsequent dates.
Commentary: This is an abundant and rather familiar little species but has been confusecj by collectors, and some students who should have known better, with the immensely larger O. gracilis (Brod. Sby.) and the ah together different O. anazora (Duclos). It is well characterized by its small size, slender form, and the details of the pillar-structure. It is named for the wellknown collector, Mrs. Howard L. Fletcher, whose first love among Mollusca was the Olividae.