Shell medium sized for the genus, fragile. Aperture roundly ovate with entire pe-ristome; columellar lip completely detached from the shell, smooth. No apparent anal notch. Outer lip smooth and erect, inner side smooth. Spire moderately low with a protoconch of unknown nature (broken) and 5 rounded nuclear whorls. Suture impressed. Body whorl bearing 3 fine varices ornamented with long, flat, closed and hollow carinal spines of the same size than the siphonal canal, followed by a varical flange consisting of 3 spinelets: the first one recurved upwards, the second one straight and the third one recurved downwards. Spire whorls ornamented with long carinal, closed and hollow spines. No axial nor spiral sculpture apparent. Siphonal canal long and hollow, sealed from the aperture to the 2/3 of its length, recurved backwards on its tip and bearing a small sharp spine on its base. Mottled with white and light brown, small spinelets and siphonal canal mostly glossy white, Radula and operculum unknown.

The new species may be compared with the two others species included in the new genus. It differs from P. zealandica in being more slender and having a narrower aperture. Moreover, P. abies is smooth while P. zealandica has a shallow spiral sculpture. Its siphonal canal is long, bearing one small spinelet, while the canal of P. zealandica shows a flaring wing, extending from the shoulder spine almost to the extremity of the siphonal canal.
P. canalifera differs in having shorter and more upward recurved shoulder spines, a shallow spiral sculpture and a shorter siphonal canal with three short spines. It has also a comparatively larger aperture.

Australia, Off Newcastle, N.S.W.