Benthofascis sarcinula is a species of sea snail, a marine gastropod mollusk in the family Conorbidae.

(Original description) The solid shell is small and has an ovate-fusiform shape.

The protoconch shows fine spiral grooves, continued on the adult as broad, shallow furrows, which are broadest at the suture becoming smaller and closer anteriorly.

The outer lip is thin, straight, produced medially, edge crenulated by the sculpture.

[2] This marine species is endemic to Australia and occurs off New South Wales, Queensland and Tasmania.