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Show 1SD 1.J LAND-SHELLS FROM BORNEO. 39 MICROCYSTINA CAVERNS, n. sp. Shell depressedly globose, solid, imperforate; sculpture, distant very fine longitudinal striae, on a smooth surface ; colour pale sienna ; spire low, apex rounded ; suture impressed; whorls 4, rather flut above, the last rounded ; aperture ovately lunate; peristome acute, oblique; columellar margin subvertical, thickened, reflected, with a slight twist. Size: maj. diam. 3'6 ; alt. axis 1*3 millim. Hab. Borneo, cave-earth. The sculpture is exactly similar to the typical species from the Andaman Islands. SITALA (?) ANGULATA. (Plate IV. fig. 7.) Trochomorpha (?) angulata, Issel, Ann. Mus. Civ. Genova, vi. p. 405, t. v. figs. 5-8 (1874). Shell pyramidal, with a raised fine rib on the keel of the last whorl, finely perforate ; sculpture decussate, the regular oblique fine costulation being crossed by regular spiral lines ; colour dark brown, liver tint; spire high, conical with slightly rounded sides ; apex blunt; suture impressed ; whorls 6, somewhat convex ; aperture elongately oval; peristome thin ; columellar margin subvertical. Size: maj. diam. 3*2; alt. axis 2*9 millim. Hab. Busan Hills (A. Everett). Issel places this in the genus Trochomorpha and justly with a query. Its nearest generic position is Sitala, as seen in the spiral lines of sculpture. The animal needs examination to ascertain if it is like that of the Indian region. SITALA EVERETTI, n. sp. (Plate IV. fig. 6.) Shell depressedly pyramidal, rounded below, imperforate, keeled ; sculpture a dull smooth surface ; the spiral ribs very fine, 3 on each whorl, evenly distributed, the one above the suture slightly the best seen, close spiral striation at base ; colour pale ashy ; spire conical, sides concave ; apex blunt; suture shallow, marked by a fine threadlike rib extending to the keel of the last whorl ; whorls 6, regularly increasing, convex ; aperture semi-lunate; columellar margin reflected, oblique. Size : maj. diam. 70, min. 6 7 ; alt. axis 4*5 millim. Hab. Niah Hills (A. Everett). This is an undoubted Sitala, a genus represented in Burmah and India by S. infula, attegia, &c. Only one specimen in the collection, among a lot of small Helices. SITALA SINGULARIS, n. sp. Shell pyramidal, sharply keeled, not umbilicated, solid ; sculpture, 10 fine lirate lines on each whorl; colour bleached; spire high, sides very slightly convex; apex papilliform ; suture shallow ; whorls 6; aperture semi-lunate, subvertical; peristome acute |
