Splendrillia zeobliqua
Splendrillia zeobliqua is a species of sea snail, a marine gastropod mollusk in the family Drilliidae.
This extant species is also described as a fossil from the Late Pliocene off Kaikōura Peninsula, New Zealand
They can grow up to approximately 18 mm in height and approximately 8.5 mm in width. They are found near East Cape and Eastern South Island
https://www.mollusca.co.nz/speciesdetail.php?taxa=3592
Primary source: Beu, A.G. 1979 Bathyal Nukumaruan mollusca from Oaro, southern Marlborough, New Zealand, New Zealand Journal of Geology and Geophysics, 22