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Show 1889.] LAND-SHELLS FROM K O R O R . 115 inner lip of the peristome round the apex of the aperture is only represented by a very thin film, so much so that except under a powerful lens the peristome appears to be interrupted. 9. DIPLOMMATINA STRIGATA, var. KORORENSIS. (Plate XII. figs. 9, 9 a.) Shell sinistral, ovate, conical, slightly rimate, moderately thick, bright brown-coloured : whorls 6£, the penultimate much the largest; sculpture on all the whorls, except the last, a fine, close, oblique striation, on the last whorl coarse, distant, and lamella-like, the last whorl not ascending at all on the penultimate; the constriction on the penultimate indistinct over the right centre of the aperture : peristome double, only moderately thick, the inner lip continuous, striated on the portion above the aperture, the outer lip distinctly winged: aperture vertical, circular, within shining and orange-coloured ; a small rounded swelling near the base of the columellar margin is generally (but not always) present. Length 4 | millim. Hab. Koror. This, M . Crosse informs me, differs from the type in being a rather thicker shell, the penultimate whorl being more swollen, the aperture larger, and the lamella-like costulation of the last whorl more regular and prominent; the artist who drew the type has, M . Crosse writes, failed to render the costulations of the last whorl correctly, otherwise the figure fairly represents m y specimens. HUNGERFORDIA (new genus). This genus differs from Diplommatina in its trochiform shape, fewer whorls, which are not convex, in the great dilatation of the last whorl, and in the constriction and operculum being in the last whorl only half a turn from the aperture. Only one species has been found (many examples), so that I do not give a generic character apart from that of the species; other species will probably be discovered in this group of islands (as yet little explored), which will either establish it as a good genus, which it appears to be, or connect it with Diplommatina only as a subgenus. 10. HUNGERFORDIA PELEWENSIS, sp. nov. (Plate XI. figs. 10, 10a, 10 6, 10 c.) Shell sinistral, trochiform, very thin, yellowish green : whorls 5 j, not convex, except the last, which is slightly so; penultimate much the broadest, formed of about 13 oblique, slightly imbricated plaits, which terminate in small wing-like convex processes extending beyond the margin ; the apical 1-| whorls very small, smooth ; third and fourth whorls with a fine, very oblique striation, the suture of the fourth being slightly winged; last whorl very thin, expanded, and wing-like, not ascending at all on the penultimate, furnished with fine oblique striations, a slight constriction about half a turn from the aperture ; umbilicus generally prominent, sometimes hidden |
