Shell small (usually up to 8.8 mm in length, but occasionally reaching 13 mm), broadly oval, radial sculpture predominant over the concentric sculpture, more or less finely cancellate, whitish and usually irregularly blotched or rayed with grayish green, gray, or brown. More finely sculptured and less strongly cancellate than D. foveolata (Garrett) from Fiji.
Length 8.86 Width 5.80 Height 3.42 Although the specimens of this species from Easter Island differ in color, being blotched and rayed with brown rather than grayish green, I can find no other basic difference in shape or sculpture on which to separate them. The sculpture in D. granifera does show some variation in the relative strength of the radial and concentric components and in the nature of the resulting reticulation. The older specimens tend to have a more convex posterior slope and a more or less arcuate base.

Diodora granifera (Pease, 1861). Length, 8 mm; diameter, 5 mm; height, 4 mm. Shell: conical, apex barely on the anterior slope; fissure elongate; margin thin; with numerous fine, nodular ribs; green and white. Sculpture: 30 or more equally spaced, rounded ribs radiating to margin with interspaces of equal diameter; spiral cords of lesser diameter than ribs, forming nodules where they intercept the ribs. Color: variable — gray-green, white, or gray or white with dark green rays; interior white or green.
These fissurellids are common, attached to the undersurfaces of rocks and rubble in tide pools, on benches, and on fringing reefs. A few shells were dredged by the Albatross at depths of from 90 to 100 m. Development is direct.
D. granifera may range throughout the Pacific: shells resembling those from the Hawaiian Islands have been seen from the Tuamotus and are reported from Clipperton Island (Hertlein and Allison, 1966). Fossils possibly referable to the species are found in post-Tertiary beds at Enewetak, Marshall Islands (Ladd, 1966).

Eastern Islands, Chile.
Hawaiian Islands, Society Islands, Tuamotus, Gambier Islands, and Easter Island. (Rehder)