Shell ovate, imperforate, rather thin and glossy. The only known specimen, 37.8 mm long, has six whorls and therefore probably is not fully grown. The spire is low, flat-sided, with only slightly impressed sutures, produced at an angle of 94°. Nuclear whorls smooth, postnuclear whorls with distinct spiral grooves, seven in number on the third, fourth, and fifth whorls. On the body whorl, the grooves near the suture and the base remain distinct, but those in the middle of the whorl become rather weak and show a somewhat irregular alternation of weaker and stronger, the total number being about 40. Besides faint axial growth lines, there are slightly raised axial riblets that become stronger toward the end of the last whorl, thus producing a distinct cancellation especially noticeable anteriorly. Last whorl with one varix; outer lip thickened, denticulate within, showing evidence of continuing growth, not reflected. Parietal wall glazed in an area.
Ground color nearly uniform ochre, with faint evidence of a few localized darker axial streaks following lines of growth. Pattern consisting of eight spiral bands of darker brown (burnt ochre) regularly interrupted with squarish spots of white. Varix and outer lip marked by seven elongated, rectangular spots of darker brown (umber) which alternate with the color bands. Operculum not seen; specimen dead, but shell in fresh condition. Holotype.—USNM No. 700004, from PILLSBURY Sta. P-851.

This small species was differentiated from Sconsia grayi by Bayer (1971) on the basis of its low spire and wide shape, its low, wide spiral cords, and its better-developed "checkerboard" colour pattern consisting of alternating brown and white maculations, in 8 relatively wide spiral bands of dark brown interrupted regularly by "squarish spots of white" (Bayer 1971). It seems likely that S. nephele is part of the range of variation of S. grayi, especially as the holotype is still apparently one of only two known specimens, but more material is required from near the type locality before this species can be evaluated adequately. H 37.8 mm.
Known only by the holotype, from off Grenada Island, and one other possible specimen from off Guyana.

Type-Locality.—PILLSBURY Sta. P-851, southwest of the island of Grenada, 11°52.8'N, 61°53.3'W, depth 18 meters, 3 July 1969.