| OCR Text |
Show 1889.] LAND-SHELLS FROM KOROR. 113 to a circular opening from the contraction of the inner shining portion of the peristome ; no trace of tooth. Length 3 millim. Hab. Koror. 3. DIPLOMMATINA RUBELLA, sp. nov. (Plate XI. figs. 3, 3 a.) Shell sinistral, oblong, conical, thick, inconspicuously rimate, reddish or reddish white in colour : whorls 6k~7 ; sculpture a fine close striation obliquely across the upper whorls, disappearing or very faint on the penultimate, coarse and distant on the last whorl, penultimate the largest and most swollen, last whorl not ascending much on to the penultimate, with a slight constriction just above the columellar margin : peristome very thick, about 4 breadth of shell, the outer margin slightly or not at all dilated, striated between the margins, the inner portion continuous : aperture circular ; no tooth. Length 3 millim. Hab. Koror. 4. DIPLOMMATINA AUREA, sp. nov. (Plate XI. figs. 4, 4 a.) Shell dextral, ovate, fusiform, thick, of a yellowish colour, blotched with black upwards : whorls 7|; texture smooth, except a few (3 or 4) coarse ribs across the 3rd and 4th whorls, and some faint striation on the penultimate, chiefly just above the aperture ; penultimate whorl the largest, constriction very faint; last whorl not ascending much on to the penultimate : peristome much thickened, about -j breadth of shell, not dilated at its outer margin, striated between the margins; inner portion of lip continuous : aperture circular; a small inconspicuous swelling on the columellar margin where a tooth is present in other species. Length 4 millim. Hab. Koror. 5. DIPLOMMATINA CRASSILABRIS, sp.nov. (Plate XI. figs. 5, 5 a.) Shell sinistral, tumidly fusiform, not rimate, thick, pale yellowish, blotched with black: whorls 6|, the antepenultimate the largest; sculpture a fine close, regular, oblique striation across all the whorls, a fold generally present on the last whorl at a little distance from the peristome ; last whorl not ascending much on to the penultimate ; a rather prominent constriction present on the penultimate above the columellar margin : peristome very thick, more than 5 breadth of shell, not dilated at its outer margin, the shining inner portion not much expanded, continuous round the apex of the aperture in only a very thin layer across which the striation of the penultimate whorl is continued : aperture vertical, oblong ; a small tooth on the columellar margin, below this a semilunate ridge is present, which runs back into the shell but not quite to the opposite margin. Length 2\ millim. Hab. Koror. 6. DIPLOMMATINA ALBATA, sp. nov. (Plate XI. figs. 6.) Shell sinistral, oblong, not rimate, thin and transparent white, shining: whorls 6-J, the antepenultimate and penultimate much |
