| OCR Text |
Show 1870.] DR. J. C COX ON NEW AUSTRALIAN SHELLS. 171 flatly sloping to the centre, causing a subcarinated appearance; last whorl suddenly reflected in front, and contracted near the aperture; aperture very oblique, ear-shaped, margin ivory-white, flatly expanded, the brown bands on the last whorl abruptly terminating at the base of the expanded lip ; margins approaching, joined by a thin callus ; columellar margin slightly dilated, and inclining to be tuberculated within. Hab. New Georgia, Solomon Isles. Diameter-greatest 0*95, least 0*70; height 0*55 inch. 4. HELIX MACGREGORI, COX. (Plate XVI. fig. 4.) Shell very widely umbilicated, flatly discoidal, quite flat on the upper surface, widely excavated below, pale yellow brown ; whorls 10 or 11, very slowly increasing, having a coiled-up appearance as in H. polygyrata, coarsely striated; last whorl keeled above, rounded below, slightly dilated and much deflected in front; suture margined ; aperture very oblique, ovately rounded; lip with an irregular margin, very slightly thickened, not reflected. Hab. New Ireland (Brodie). Diameter-greatest 0*93, least 0*82 ; height 0*23 inch. This species so much resembles the smaller varieties of H. polygyrata that it need not be mistaken for any other species ; its coiled-up, money-like appearance would at once attract attention. I have named it in honour of m y late friend Capt. MacGregor, who for several years was a most enthusiastic collector among the Solomon group of islands. 5. HELIX CHANCEI, COX. (Plate XVI. fig. 5.) Shell imperforate, conoid, faintly striated from above downwards with straight striae, and longitudinally striated with more distinct wavy striae, white, ornamented on the centre of the whorls with a broad brown band, and round the base with a broad brown zone; spire pyramidal, black at the apex; whorls six, the last rapidly increasing in size and inflated, suddenly deflected in front, and contracted behind the lip ; aperture large, irregularly ovately rounded, margins approaching, lip slightly thickened and reflected ; columellar margin moderately dilated and excavated, and darkened by a black callus. Hab. Ysabel Island, Solomon Islands. Diameter-greatest 1*30, least 1*07; height 1*25 inch. This handsome species is an intermediate form between Helix coniformis of Ferussac and H. louisiadensis of Forbes, but is of a more decidedly trochiform appearance. 6. HELIX CONVICTA. (Plate XVI. fig. 6.) Shell imperforate, solid, orbicularly conoid, transversely faintly striated, and decussated with fine longitudinal striae, pale yellowish white, ornamented with two narrow brown bands, one near the centre of the whorls, the other immediately below the suture, which is rather impressed ; spire broadly conical, apex obtuse; whorls 6}, |
