Brachytoma investigatoris (Smith E.A., 1899) Drillia investigatoris is a species of sea snail, a marine gastropod mollusk in the family Drilliidae.

It shows a pale band above the middle of the whorl.

The aperture is narrow and measures almost half the length of the shell.

The outer lip is sinuate close to the suture.

[2] This species occurs in the demersal zone off the Andaman Islands.