Shell small, thin, slender, the axis slightly bent, of a pale cinereous or buff color, with six or seven whorls; nucleus large for the size of the shell, rather inflated and loosely coiled, polished white; spiral sculpture on the early whorls from four to six little-elevated flattish threads with subequal interspaces; between the suture and the periphery on the later whorls these spirals disappear but persist on the periphery and between it and the succeeding suture or the end of the canal; on the last whorl these threads become faint or obsolete, but on the preceding whorls do not enlarge in crossing the ribs; transverse sculpture on the earlier (except the first two) whorls, of eight to eleven rather stout narrow ribs or costae, extending from a little in front of the suture over the periphery, where they are strongest, to the next suture, and overrun but not nodulated by the spirals; on the last whorl the transverse as well as the spiral sculpture becomes obsolete; suture distinct, somewhat appressed; whorls noderately rounded; canal slender, slightly tortuous and distinctly recurved; aperture elongate, pointed before and behind, the canal distinct: outer lip thin, simple, not internally lirate; pillar slender, twisted, with a thin glaze; one shorter anterior and two posterior strong transverse plaits. Maximum longitude of shell, 14; maximum latitude of shell, 4mm.

This species, like M. Meekii Dall, was taken without the soft parts. It is a minute fusiform Fasciolaria with the transverse plaits of a Mitra. In Ptychatractus, which seems to be its northern representative, the plaits resemble those of Fasciolaria and not those of Mitra. The group was first differentiated by Meek as a Cretaceous fossil. Both the recent species inhabit the deep waters of the Antilles. A fragment of still another species, or a Cordieria, insufficient for description but evidently new, was dredged in 49G fathoms, at Station 2750, near St. Bartholomew, West Indies.

Caribbic. South of St. Kitts, West Indies.