Synaptocochlea montrouzieri is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.

Its color is deep opaque black, obliquely girdled with white.

They are rounded, the last forming the greater part of the shell.

It is shining within, concolored with very translucent white bands.

The left margin is subthickened, arcuate, reflexed posteriorly, and appressed.