Three specimens among the New Caledonian material, two from Vanuatu and three from the Marquesas Islands agree with Distorsio graceiellae. previously recorded from the Philippine Islands only. These specimens share with D. euconstricta the distinctive characters of very small maximum size (holotype of D. graceiellae H 30.7. but rarely over 25 mm high) and the sharp ridge on the base of the inner lip. separated from the columellar base by a slit only about I mm wide. D. graceiellae differs from D. euconstricta in its horizontal sutural ramp (on the inflated area to the left of the aperture, in conventional apertural view) and much more sharply angled periphery, formed by a narrow, elevated group of four of five narrow, closely spaced spiral cords, followed below by a narrow, weakly contracted zone without prominent spiral sculpture, followed again by a single protruding cord. The most obvious difference, though, on initial examination, is in coloration: D. graceiellae is generally whitish i.e. paler than the uniform salmon orange D. euconstrict , with the aperture and columellar shield a pale, translucent yellow to pale yellowish brown, and diffuse pale brown to medium red-brown zones around the suture, around the narrow peripheral contracted zone, and over the neck of the last whorl. These differences seem consistent in the material I have examined, particularly in a large lot of both species from the Philippine Islands in AMS. DIMENSIONS. — Holotype: H 30.7. D 18.8. - Loyalty Ridge: H 17.7, D 10.5. Marquesas Islands, Eiao I.: H 27.7. D 17.1.
DISTRIBUTION. — Distorsio graceiellae is recorded to date from the Philippine Islands, eastern Indonesia. Vanuatu, New Caledonia and the Marquesas Islands, and at both the Philippines and New Caledonia it is sympatric with D. euconstricta. Clearly, it can be expected throughout the western Pacific between these extremes, in about 100-400 m.