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Show 1873.] AUSTRALIA AND THE SOLOMON ISLANDS. 147 apex ; spire elongated ; whorls 7, very gradually increasing in size, the last one being subcarinated ; base rounded ; aperture lunar-oval; periphery straight; margins slightly approximating, and united by a rather thin columellar callus, which descends perpendicularly, and becomes broadly dilated, concealing the umbilicus ; aperture and interior of the lip pale, the lip shortly reflected throughout. Diam., greatest 0*80, least 0*68; height 1*22 inch. Hab. Solomon Islands. In the collection of Mr. W . H . Hargraves, of Sydney. HELIX (DISCUS) CEREALIS, sp. nov. (Plate XVI. fig. 1.) Shell with a deep, rather narrow umbilicus, subpellucid, of a dull white colour, rather coarsely obscurely striated above, smoother and shining at the base ; spire slightly raised, bluntly rounded ; whorls 6, slowly increasing in size, the last one subcarinated, shortly depressed in front and flatly expanded outwardly, broader at the base ; aperture very oblique, transversely oblong ; lip slightly thickened and everted above, reflexed below; margins approximating, united by a thin glazed callus; columellar margin triangularly dilated at its insertion, and overhanging the umbilicus. Diam., greatest 0*72, least 0*62 ; height 0*50 of an inch. Hab. Solomon Islands. In the collection of M r . W . H . Hargraves, of Sydney. HELIX (GEOTROCHUS) QUIROSI, sp. nov. Shell imperforate, conoidly depressed, thin, translucent, rather coarsely striated, of a pale brown throughout; spire broadly and flatly conoid, acute at the apex ; whorls 5^ to 6, convexly flattened, the last one considerably inflated, and sharply keeled at the periphery ; base rounded; aperture squarely lunar, angled at the periphery of the last whorl and at the junction of the lower and columellar margins; lip slightly thickened and expanded ; columellar margin straight, thickened, not dilated nor reflexed. Diam., greatest 080, least 0*64; height 0*40 of an inch. Hab. Solomon Islands. In the collection of M r. W . H . Hargraves, of Sydney. This species would be like a magnified specimen of H. cleryi ' (Recluz) were it not wholly unornamented, much more broadly expanded, and less conical. HELIX (GEOTROCHUS) BLANDA, sp. nov. Shell imperforate, conical, very thin, translucent, obliquely finely striated, of a pale brownish yellow; spire with the apex acute; whorls 7, gradually increasing in size, the last moderately inflated and sharply carinated at the periphery ; base flattened; suture not margined; aperture subrhomboidal, margins somewhat approximating, not united by a callus, subangulate at the periphery of the last whorl; margins simple, slightly everted, columellar margin descending vertically, joining the basal margin at an obtuse angle. 10* |