DIAGNOSIS: A Columbarium of tumid whorls with a somewhat squat almost conical spire. Posterior whorl slope smooth and convex; anterior whorl slope of body whorl bearing a prominent spinose lira posterior to the anterior carina and one or two spinose lirae between it and the canal.
DESCRIPTION: Shell with a squat almost conical spire of tumid whorls cut by a keel bearing laterally directed keel spikes. Keel on early whorls produced into a flange and with spikes developing on the third or fourth whorl. Posterior whorl slope smooth and convex; anterior whorl slope of spire smooth and on the body whorl with a spinose lira immediately posterior to the anterior carina and with one or two spinose lirae between it and the canal. Aperture subquadrate. Canal long and twisted and having numerous lirae bearing well developed spines. Radula and operculum typical of the family. Height Holotype 51 mm; Width Holotype 24 mm.

LOCATION OF TYPES: Australian Museum, Sydney: Holotype C67025, C. trabeatum Holotype C60675; National Museum of Victoria: Hypotype F27079.
TYPE LOCALITY: 23 miles E. of Sydney, N.S.W. Australia. 250 fathoms.
OCCURRENCE: Type locality; Off Broken Bay, N.S.W. 75,100 fathoms; Off Twofold Bay, N.S.W. 45 fathoms; Off Stanwell Park, N.S.W. 75 fathoms.