Shell rather large, 42-52 mm in height; similar to the typical species but proportionately wider, and with the upcurved peripheral spines emanating from a more projecting flange. The chief difference is in the spiral sculpture which is absent from the spire-whorls, except for several undulating threads both above and on the underside of the peripheral flange. Also, on the body-whorl, the spirals which are finer and weaker than in the typical species, are weakly granulose but only below a smooth hiatus, of varying width, that encircles the upper part of the base. The peripheral spines, which are hollow, triangular and upcurved, number 23 on the last whorl in the holotype, and between 22 and 27 in other material. The sinus is very deep but rather broadly rounded at its apex, the whole occupying the smooth part of the shoulder area, from the suture to the several fine undulating spiral threads on the upper surface of the peripheral carina. The colour is dull white under a very thin, pale buff periostracum. Range —Philippines, deep water.
Remarks — This seems to be a well marked regional subspecies that is confined to the Philippines Islands. It lives on green mud, grey mud and fine sand, or grey mud with Globigerina.