Anacithara themeropis is a species of sea snail, a marine gastropod mollusk in the family Horaiclavidae.

Two forms have been seen by us, differing in colour as follows :—In what would be considered the type, an ashy brown is the prevailing hue, filleted round the whorls transversely with bluish white.

In the other, a handsomer variety, a warm ochre with flecking and median brown linear banding round the three last whorls, which are seven in number altogether.

It is very solid, obtusely ribbed with fine spiral striae.

[2] This marine species occurs off the Loyalty Islands.