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Show 630 MR. C. BOCK ON SHELLS FROM [May 17, which descends considerably, and the peristome is almost continuous and ovate. I have associated with this shell the name of Mr, Edgar Smith, the well-known conchologist of the British Museum. 9. HELIX (GEOTROCHUS) RUFO-FILOSA, sp. nov. (Plate LV. fig. 4.) Shell shortly conical, narrowly umbilicated, thin, semitransparent, of a greyish or horn-colour, sometimes with a thread-like red line bordering the sutures and encircling the last whorl at the periphery. Spire with rectilinear outlines, converging at an angle of about 30°, rather obtuse at the apex. Whorls 7, very obliquely striated, slowly increasing, keeled beneath immediately above the suture ; three or four uppermost rather more convex than those beneath, which are but slightly so ; last volution acutely carinate at the middle, and convexly flattened beneath. Aperture small, oblique. Peristome thin, outer margin above the keel scarcely expanded, beneath it feebly thickened and narrowly reflexed, in the umbilical region more expanded and partly concealing the perforation. Length from 10 to 11 millim., greatest diameter of base also 10-11 millim. Hab. In the forest at Paio, 1500 feet above the sea. Only six specimens found ; rare. 10. HELICARION SUMATRENSIS, Schepm. Hab. Paio ; very rare. 11. BULIMUS (STENOGYRA) PAIOENSIS, sp. nov. (Plate LV. fig. 5.) Shell elongate, subulate, imperforate, of a dirty greyish-white colour, covered with a somewhat deciduous and coarsish olive epidermis. Whorls 12, apical ones obtuse, glossy, vitreous, these and the few succeeding rather convex and slowly enlarging, the five last proportionally longer and flatter, increasing more in length than breadth, and separated by a rather oblique deepish suture. Sculpture consists of coarsish oblique flexuous, indistinctly subgranose raised lines of increment. Aperture elongate, subpyriform, acute above, occupying rather more than one fifth of the entire length of the shell. Outer lip (viewed laterally) oblique, a little excurved near the suture, simple, thin. Columella whitish, slightly arcuate and thickened, appressed to the whorl, connected with the extremity of the labium by a very thin callosity. Length 40 millim., diameter 7\ millim. ; aperture 9 millim. long, 3 millim. broad. HaB. Paio, Sumatra, 1500 feet above the sea. The animal is of a yellow colour, has a short foot, and carries its shell in an oblique position. 1 never met with this interesting species in any other spot in the highlands ; and even at Paio it appears to be rare ; for in all, after close search, I found but fourteen specimens. 12. BULIMUS (AMPHIDROMUS) ADAMSI, Reeve. HaB. Sidjoendjoeng, Paio, &c. |