Shell 15 to 21 mm. in length, conical, rather elevated, with the apex a little in front of the middle. Base ovate. Slopes straight or very slightly convex, particularly the posterior. Orifice small, ovate, extending anteriorly from the apex, its narrower end being frontally placed. Surface lusterless, sculptured with rounded, strong, alternately large and smaller ribs crossed by concentric laminae which form squamous nodules where they intercept the ribs, cutting the interstices into rectangular pits. Between the laminae are intercalated two or three threads. Color from white to buff', freckled all over with elongated brown spots. When the specimens are worn the spots turn pinkish. Sometimes there are present light brown rays varying in number from 5 to 7 over which the spots are clearly visible. Margin finely crenulated, the denticulations arranged in pairs. Inside color white with the sculpture of the outside showing through as line radiating and concentric white lines. Internal callus of the orifice white, oval, truncated posteriorly.

Diodora jaumei Aguayo and Rehder, 1936 Jaume's Keyhole Limpet Distribution: Florida, Texas; Lesser Antilles. Size: 15 to 21 mm.
Description: Color from white to tan with brown splotches on fresh specimens, inner surface glassy white; shape conic; moderate height; sculpture of alternating modular small and large ribs, intersected by concentric threads forming nodules where they cross; margin serrate in pairs of small and large teeth that correspond with the radial ribs; slopes typically straight but may be slightly convex; surface dull; apex characterized by a blunt knob positioned behind the rounded orifice. Habitat: Hard substrate. In Texas found at Stetson Bank. Depth range from 0 to 402 m (1319 ft).
Remarks: Species rare, not commonly found in beach drift. Usually in depths from 18 to 108 m (60 to 360 ft). See Perez-Farfante (1943a); Ode (1988d); Redfern (2001).

This delicate and beautiful species is rather rare although widely distributed.
It has usually been collected in depths of 10 to 60 fathoms, though G.W. Van Hyning found live specimens on rocks at low water at Tortugas, Florida. A few specimens have been obtained in beach drift. From young specimens of D. listeri which it approximates, it differs by having a less pronounced sculpture, with the ribs more closely set. The orifice of D. jaumei is ovate and not key-hole shaped as it is in D. listeri and also the orifice is not outlined or stained with black as it is in this latter species.

Florida, from Lake Worth south to Tortugas and north along the Gulf coast to Camp Walton. Cuba and south to Trinidad.