| OCR Text |
Show 116 ON NEW LAND-SHELLS FROM KOROR. [Mar. 5, by the peristome ; aperture very oblique, an oblong tooth-like process more or less developed near the base of the columellar margin, which runs parallel with the inner portion of the peristome : peristome thin, single, completely overlapped by the dilatation of the last whorl, or sometimes the edge of the whorl forms its outer margin : operculum thin, horny, concave on the outside, with about six whorls from a minute central nucleus only drawn up, the last whorl about half a turn from the mouth. Length 4 millim.; height 3 millim. Hab. Koror. I am indebted to Dr. Hungerford for a very perfect specimen of Arinia scalatella collected in Zebu. The operculum, which is quite similar to that of Diplommatina, is situated only a short distance from the aperture, being clearly visible looking up the orifice; there is no sign of a constriction. Arinia appears to me to be a good genus, at any rate it cannot be placed in the Nicida section of Diplommatina with the South-Indian and Ceylonese species ; the transverse striations, never present in Nicida, are prominent on the upper whorls, and the position of the operculum seems to be a marked distinction. 11. HELIX (ENDODONTA) KORORENSIS. (Plate XII. figs. 11, 11 a, 1\ b, lie.) Shell very narrowly umbilicate, thin, somewhat discoid ; spire depressed ; colour light brown, blotched with a darker shade, transversely decussated with about 23 revolving, prominent, thin, wavy ribs, otherwise smooth : whorls 5, convex ; peristome thin ; aperture lunar-circular, furnished with 4 narrow lamellae on the parietal wall and 9 on the opposite exterior wall, all of which run into the shell parallel with the whorl about 4 millim. Diameter of shell 5^-6 millim.; height 4 millim. Hab. Koror. A very beautiful species. 12. HELIX (ENDODONTA) FUSCO-ZONATA. (Plate XII. figs. 12, 12a, 12b, 12c.) Shell convex, depressed, thin, pale yellowish brown, transversely banded with fuscous bars; spire scarcely raised, obtuse: whorls 6, furnished with rather prominent, close, transverse, oblique striations, the sutures convex and considerably raised; the last whorl rather sharply angled at the periphery: umbilicus small but distinct; aperture lunate : peristome simple, thin ; three elongated lamellae on the parietal wall, which run some way into the shell, two prominent but rather shorter ones opposite on the outer wall, near the umbilicus and one or two subobsolete ones just beyond these. Length of shell 3-g- millim.; height 2 | millim. Hab. Koror. Nearest to H. constricta (Semper), but differs considerably in its prominent striation, sharply angled periphery, and raised sutures. |
