Shell high, narrow, fusiform, conical, with rounded whorls and a shallow suture, below which the inferior whorl swells out tumidly ; the last whorl is short and rounded, with a constricted conical base and a long narrow snout. Sculpture: Longitudinals: there are strongish, close-set, rounded, hair-like lines of growth, specially strong below the suture. Spirals: over the whole, surface are strong, but unequal, rather distant, sharpish threads; those in the sutural area are, with two or three exceptions, weaker than those elsewhere; about three at the periphery are somewhat prominent. Colour porcelain-white under a thin yellow epidermis. Suture fine, superficial, but well defined. Mouth is club-shaped, being oval, with a long narrow canal below and a blunt angulation above. Outer lip very evenly curved, but a little more steeply above than below; it is drawn out into a long straight line along the side of the canal; the edge-line, on leaving the body, retreats very straight toward the left to the rather remote, wide, and openly rounded, but very deep sinus, between which and the body-whorl lies an acute triangular shelf, while below is the very high shouldered and prominent lip. Inner lip is exceptionally narrow, but strong and marginated; it is very little concave at the junction of the body and the pillar, which is long, narrow, and is cut off at the point with a long, little oblique, sharp, and scarcely twisted edge. H. 1.65 inch. B. 0.6 inch. Penultimate whorl, height 0.22 inch. Mouth, height 0.9 inch, breadth 0.3 inch.

This is a species of interest, both from its habitat and from the simplicity of its rounded whorls and of its sculpture. It exists unfortunately in the form of a mere fragment. It is a good deal like Pleurotoma planetica, Edw., from the Eocene Brackleaham beds, but has not the flatly constricted band below the suture, which in that species throws the whorls out in a high rounded shoulder. In Pleurotoma rostrata, Edw. , though with less of a shoulder, there is a broader constricted belt, and there are traces of longitudinal ribs.

Midd Pacific. East of Japan.