Shell minute, long-ovate, white, with a glassy headlike nucleus and an enrollment of about one whorl; the apex nearly terminal at the posterior end; anterior slope convexly arched, slit about half as long as the shell, narrower in front, the scar extending backward the whole length of the shell; sculpture of more or less crowded fine granulate radial lines with lines of granules in the interspaces; margin entire, interior polished, the scar of the slit appearing as a rounded ridge; the nucleus is a little prominent on the right side of the spire. Length, 3; breadth, 2.3; height, 1 mm. U. S. Nat. Mils. Cat. No. 108148.
Off Fernandina, 3 specimens.

Shell delicate, low, the height being less than half the length. Basal margin oval. Anterior slope long and convex, posterior slope very short and concave. Apical whorls one and one quarter, glossy, almost terminal, located almost immediately behind the posterior margin and on the right side. Anal fasciole very narrow and depressed, starting rather far from the apex and extending only a short distance. Fissure lanceolate and narrow, continuing to the margin in the form of a very narrow7 slit. Sculpture consists of rather widely-spaced granulose radiating ribs, stronger on the posterior half of the shell. There is no true concentric sculpture, but the lines of growth are clearly seen. Interior of the shell highly polished. The anal fasciole marked by a slightly convex callus. The posterior end of the fissure is covered by a short septum. Muscular impression clearly marked. Length 3 mm, Width 2 mm.
Types. Holotype, United States National Museum, no. 108148, from off Fernandina, Florida, Albatross, station 2668 in 294 fathoms. Paratypes from the same locality, also in the USNM.
Remarks. Though originally described as a species in the genus Rimula by Dall, it is a Puncturella in the subgenus Cranopsis. It belongs here primarily because it possesses a septum ; it has also a fissure continued as a slit to the margin, a condition found in young shells of Cranopsis. Dall's types are immature specimens; adults are as yet unknown.