OCR Text |
Show 1891.] LAND-SHELLS FROM BORNEO. 37 Size : maj. diam. 7'6, min. 7*5 ; alt. axis 4'6 millim. Hab. Busan Hills (A. Everett). Microcystis (?) macdougalli. Nanina (?) macdougalli, Issel, Ann. Mus. Civ. Genova, vi. p. 400, t. v. figs. 9-12 (1874). MICROCYSTIS DYAKANA, n. sp. (Plate IV. figs. 4, 4 a-4 c.) Shell globose, thin, semi-transparent, very narrowly jaerforate, almost imperforate ; sculpture, under high lens very minute, somewhat wavy spiral striation, to the naked eye smooth and glassy ; colour pale dull ochraceous ; spire moderately high ; apex blunt; suture adpressed, shallow ; whorls 4, convex, rather rapidly increasing; aperture semi-ovate; peristome sharply edged, reflected at the columellar margin, which is oblique, not thickened. Size: maj. diam. 8*7, min. 7'7 ; alt. axis 4*5 millim. Hab. Busan Hills (A. Everett). This might very easily be mistaken for Microcystis tersa but for its larger size and fewer whorls, the form of the apex of the shell when viewed from the front being also very different. The animal is of a pale ruddy brown colour with large black patches and spottings. The right shell-lobe (r.s.l.) very ample, triangular in form ; the left shell-lobe also large as well as the neck-lobes (figs. 4 a & 4 b). The radula was not seen, this part had been destroyed before it was placed in spirit. The generative organs were also not perfect. The male organ is shown in Plate IV. fig. 4 c. Microcystis (?) lowi. Hyalina (?) lowi, Issel, Ann. Mus. Civ. Genova, vi. p. 401, t. v. figs. 16-19 (1874). Microcystis (?) perlucida. Hyalina perlucida, Issel, Ann. Mus. Civ. Genova, vi. p. 402, t. v. figs. 20-23 (1874). MICROCYSTIS (?) MILIACEA. Microcystis (?) miliacea, v. Martens, Preuss. Exped. Ost-Asien, Landschneck. p. 268, plate xii. fig. 15. Liocyslis, Nevill, Hand-list, M S. (from Amboyna). Borneo (Sowerby, ex coll. Lombe Taylor, in coll. Indian Mus., Calcutta). There is a doubt both as regards identification and habitats. MICROCYSTINA INFANS. (Plate IV. fig. 2.) Helix infans, Pfeiff. P. Z. S. 1854, p. 290; id. Monogr. Helic. iv. p. 51 (1859), et v. p. 108 (1868); Reeve, Conch. Icou. pi. cci. fig. 1417 (1854). |