Shell in general resembling G. blakeana but differing by more elevated spire, by the much stronger closely set spiral threads, which cover the whole shell, by the rounder and more oblique riblets confined to the vicinity of the angulation in the adult and nearly absent on the spire, and the columella so arched and twisted as to make the axis nearly pervious. The epidermis is rougher and darker than in the type and there are six whorls without the nucleus. Long. of shell, 10.0 mm ; of last whorl, 7.5 mm; lat. of shell, 6.0 mm.
NOT PICTURED

A much larger shell with the surface much eroded was collected near Guadelupe. In this the general form has become more oval, the angulation a sharp keel forming a notch in the outer lip, and when perfect probably marked with vaulted scale-like projections. There is a sulcus in front of this keel. The slope from the suture to the keel is much steeper than in var. agria, and even a little rounded. Before the sulcus the whorl is covered with coarse primary threads, over and among which are a finer secondary series. The columella is callous and twisted, there is a short but evident canal, slightly recurved, and followed by a siphonal fasciole. The transverse riblets appear to have been well marked only on the periphery. There are five whorls, but the apex is eroded; there were perhaps two and a half more beside the nucleus. I regard this as probably the adult form of the var. agria, but it is too imperfect to decide with certainty.

Northwest Atlantic. Chesapeake Bay.