The shells to which I give this name are closely related to those of H.. fenestrata, they differ by their more rapidly-increasing whorls, in having two stout lirae on the penultimate-whorl, five on the body-whorl, the stouter and more distant transverse riblets which, moreover, are less oblique or nearly axial in direction, and by the feebler nodosities on the lirae. The colour-spots are usually confluent on the axial riblets. Dimensions: Height, 3 mm ; diameter, 3,25 mm.