. The Conchological magazine. Mollusks. Fig- 2. Hypselostom Hypselostoma insularum n. sp. Fig. 2. The shell is very small, conic, with wide, nearly flat base ? thin, pale brown, dull and lusterless, lamtly striate, and encircled with minute spiral stria;. Whorls 45^, convex. The penultimate whorl becomes flat in its last half. The last whorl has a stronp- but not acute peripheral keel, which does not reach to the aperture. Above the keel the whorl is flattened and concave ? below it is slightly convex. Near the aperture the whorl is straii^htened, loses the keel and becomes convex above and be
. The Conchological magazine. Mollusks. Fig- 2. Hypselostom Hypselostoma insularum n. sp. Fig. 2. The shell is very small, conic, with wide, nearly flat base ? thin, pale brown, dull and lusterless, lamtly striate, and encircled with minute spiral stria;. Whorls 45^, convex. The penultimate whorl becomes flat in its last half. The last whorl has a stronp- but not acute peripheral keel, which does not reach to the aperture. Above the keel the whorl is flattened and concave ? below it is slightly convex. Near the aperture the whorl is straii^htened, loses the keel and becomes convex above and below, somewhat tubular. It ascends slowly. The base is weakly convex with a minute central perforation and alone, curved, umbilical suture. The aperture stands free of the preceding' whorl, and looks upward somewhat. It is irregularly peristome is continuous, free, thin. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hirase, Yoichiro, 1859-1925. Kyoto : Published by Y. Hirase
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmollusks, bookyear190
