Shell rather small, about 10 mm. in length, conical, elevated, sometimes to a considerable degree and slightly narrower in front. Summit completely curved forward, situated in the first third. Anterior slope short and steep: posterior slope very convex. Orifice situated at the apex, very small and trilobated, the central portion broader than the ends. Surface dull, sculptured with numerous alternating larger and smaller radiating ribs. These are crossed by many fine concentric threads which form very minute scales where they intercept the ribs; both ribs and threads are so close-set that the whole shell has a scaly appearance. Basal margin narrowed anteriorly, ovate, with the sides arched so that the shell rests upon the two ends alone. Color white or cream, with 8-10 tan or light brown, solid or broken rays. Margin very finely and sharply crenulated. Interior color a polished white. Internal callus of the orifice also white, oval and very slightly truncated behind.

D. arcuata is apparently related to D. variegata but differs by being higher, the apex definitely curved forward, the anterior slope shorter and the posterior slope more pronouncedly convex. The sculpture also is different, being scaly in D.arcuata. and beaded or reticulated in D. variegata; finally, the color rays in D. arcuata are a lighter brown.

Range. Florida, Bahamas, Greater and Lesser Antilles south to Trinidad. The type locality is St. Thomas, Virgin Islands.