Cancellaria melanostoma Sowerby, 1849 Merica melanostoma is a species of sea snail, a marine gastropod mollusk in the family Cancellariidae, the nutmeg snails.

Its size varies between 14mm and 38 mm, ending in a pointed apex.

The shells are more globular than the rest of the genus, accented with rounded shoulders and deep sutures.

The surface is covered with fine nodules.

[4] This species is distributed in the Red Sea, western Indian Ocean, the Gulf of Oman, Western Australia and Northern Australia