Shell small, fusiform; nuclear whorls two, smooth, normal whorls four, obliquely truncated above, angulated, below the angle somewhat convex; surface marked by numerous small revolving ribs, except on the middle of the whorls, where they are larger, more distant and ornamented by small nodes; aperture rather broad; inner lip lightly encrusted; outer lip thickened behind, sub-acute on the margin; posterior sinus moderately deep, round and with a polished and thicked margin, placed close to the suture; canal very slightly twisted; color, a pure white, polished. Hab. Catalina Island, 40 fms. Dr. Cooper. No. 1052, Mollusca, Survey Cabinet. DAPHNELLA, HINDS. D. CLATHRATA, G. D. t. parva, fusiformis, tenuis; anfr. III nucleosis, lævibus; anfr. normalibus III+ supra oblique truncatis; superficie confertim clathrata; striis radiantibus obsoletis circa basim; apertura magna; columella parum tortuosa; labio parum incrassato; labro acuto; sinu postico sub-profundo, supra acuto, ad suturam attingente; colore albido, sparsim brunueo punctato. Long. ·37, lat. ·14, long. aper. ·22. Shell small, fusiform, thin, aperture longer than the spire; nuclear whorls three, smooth; normal whorls three or more, obliquely truncated above, convex below, this truncation is partially obsolete on the last whorl; surface closely clathrate, except on the lower part of the last whorl where the radiating lines become obsolete; aperture large, columella somewhat twisted, slightly encrusted; outer lip thin, acute, posterior sinus moderately deep and narrow, adjoining the suture and angular at its upper corner; color, brownish white with minute brown spots sparsely scattered, usually placed on the larger of the revolving ribs. Hab. Santa Catalina Island, 60 fms. Dr. Cooper. This little shell looks not unlike the young of _Pleurotoma Carpenteriana_, _supra_, but on a critical comparison, shows several characters incompatible with such a reference; the strongest of these is the peculiar shape of the posterior sinus. In addition to this, the whorls of the present species are much more numerous in proportion to the size, the first six whorls of _P. Carpenteriana_ making a shell three or four times the diameter of this one. No. 1053, Mollusca, Survey Cabinet. MANGELIA, LEACH. M. HEXAGONA, G. M. t. parva, fusiformis, gracilis; apice sub-acuto; anfr. II lævibus; anfr. norma libus V, costis radiantibus VI acutis induta; tota superficie minute et confertim clathrata; colore albido, lineis rufo-brunneis spiralibus fasciato; apertura angusta; columella vix tortuosa, labro acuto; sinu postico lato, haud profundo. Long. ·34, lat. ·1, long. aper. ·15.