The outer lip shows a deep notch squared at the bottom, then strongly arched forward, later contracted for the siphonal canal.

The columella is nearly straight, attenuated and twisted in front, making the end of the siphonal canal flare a little.

It belongs to the group of which Pleurotoma speciosa Reeve forms a member, by its sculpture, though whether the nucleus would agree with that species is uncertain.

At present our judgment on such subdivisions as Gemmula Weinkauff, founded on nuclear characters, must be held suspended.

[2] C. periscelida can be found in Atlantic waters, ranging from the coast of North Carolina south to Colombia.