Sinezona ferriezi is a species of small sea snail, a marine gastropod mollusk or micromollusk in the family Scissurellidae, the little slit snails.

The remaining whorls are rather plane, lamellosely bicarinate above the middle, channelled between the carinae.

The body whorl is subdescending, and is a little constricted just below the carina, then inflated and convex.

The groove terminates a short distance behind the lip in an oblong foramen, which does not attain the edge of the lip, a smooth space intervening.

The simple peristome is thin, acute, and subcontinuous.