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Show 1867.] MR. G. F. A N G A S ON NEW HELICID.E. 889 at the base, which is also ornamented with two partially interrupted spiral chestnut bands ; aperture oblique, rhomboidally ovate ; peristome rose-coloured, the margins distant, the right slightly flexuous and expanded, the basal reflexed, arcuated and obsoletely toothed within. Diam. maj. 9, min. 7|, alt. 6| lin. Hab. St. Stephen Island and Ysabel Island, Solomon group. 3. GEOTROCHUS AMBROSIA. (Pl. XLIII. figs. 9, 10.) Shell imperforate, globosely conical, moderately thin, very finely obliquely striated, whitish, ornamented with two purplish brown bands, the lower one broader, and frequently mottled with irregular opaque bluish-white oblique blotches ; spire convexly conical, apex rather obtuse; whorls five, convex, the last descending, convex at the base, which at the front part is purplish brown, from which a third band of the same colour extends a little below the periphery; columella sloping, rather wide, nearly straight, flattened; aperture diagonal, truncately oval; peristome white, the margins distant, the right slightly expanded and flexuous, the basal reflexed. Diam. maj. 10, min. 8^, alt. 10 lin. Hab. Galera, or Russell Island, Solomon group. 4. GEOTROCHUS COXIANUS. (Pl. XLIII. figs. 7, 8.) Shell imperforate, trochiform, rather thin, obliquely finely striated, polished, creamy white, the lower whorls ornamented with irregular chocolate-brown spots; spire conical, apex rather obtuse; whorls six, flatly convex, the last scarcely descending, obtusely angled at the periphery, convex at the base, the umbilical region pale purplish brown, with the central portion chocolate-brown ; columella sloping, flattened, chocolate-brown ; aperture very oblique, ovate ; peristome chocolate-brown, the margins approximate, slightly thickened and expanded, the right flexuous above. Diam. maj. 11, min. 9^, alt. 11 lin. Hab. Ysabel Island, Solomon group. I have named this beautiful species in honour of Dr. Cox of Sydney, whose indefatigable exertions in the cause of science have made us acquainted with many new Australian and Polynesian shells. 5. GEOTROCHUS MENDANA. (Pl. XLIII. figs. 11, 12.) Shell perforate, conical, solid, obliquely finely striated, pale brown, ornamented with a whitish sutural band and two chestnut bands, the upper contiguous to that at the suture; spire conical, apex acute ; whorls seven, slightly convex, the last not descending, obscurely angled at the periphery, convex at the base, which is broadly banded with reddish brown; aperture diagonal, truncately oval; peristome white, widely expanded and reflexed, the columellar margin triangularly dilated and reflexed, almost covering the perforation. Diam. maj. 11, min. 9, alt. 13 lin. Hab. Ysabel Island, Solomon group. PROC. ZOOL. Soc-1867, No. LVII. |