Carenzia trispinosa is a species of sea snail, a marine gastropod mollusk in the family Seguenziidae.

The edge of the umbilicus is sharply defined by a fine line, outside of which is a broad shallow furrow bordered externally by a slight spiral.

The colour of the shell is porcellanous when young and fresh, but weathering to a chalky white, with a pearly nacre below the thin surface and within the mouth, especially at the outer upper corner.

The apex is very small and sharp, flattened on the one side, and with the minute 1¼ embryonic whorl projecting tumidly on the other.

The curves are very faintly indicated by the lines of growth, but are similar to those described in Seguenzia formosa Jeffreys, 1876, there being three sinuses, one near the suture between the first and second spinose thread, a second, very small but sharp, at the carina, and a third toward the exterior of the base.

A strong twisted tooth projects at about two-thirds of its length, below which is a smaller sinus running out into a point at the extreme end of the columella.

The umbilicus is more open than large, perpendicular and deep, being only slightly narrowed by the reverted coluimellar lip and by the corresponding ridge which twines spirally round the columellar wall.