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Show 170 DR. J. C. COX ON NEW AUSTRALIAN SHELLS. [Mar. 24, 3. Descriptions of eight new Species of Shells from Australia and the Solomon Islands. By J A M E S C. Cox, M.D., C.M.Z.S. (Plate XVI.) 1. HELIX RAINBIRDI, COX. (Plate XVI. fig. 1.) Shell deeply openly umbilicated, globosely turbinate, rather thin, faintly striated, dark chestnut-brown, almost black, ornamented by two broad dark yellow bands about the centre of the whorls, and one round the umbilicus, which is much excavated and broadly funnel-shaped ; spire broadly conoid, obtuse; whorls 6| to 7, convex, last deflected in front; aperture oblique, roundly lunate; lip dark and metallic at the margin, broadly expanded and somewhat reflected; margins approximating, joined by a thin callus; columellar margin much expanded, overhanging the broad, open, funnel-shaped umbilicus. Hab. Mount Dryander, Port Denison, Queensland. Diameter-greatest 1*75, least 1*20; height 1*35 inch. This fine species, named after its discoverer, was sent to m e as Helix mitchellce, Cox, which in general appearance it much resembles ; it is, however, easily distinguished by its less conical shape, and by its being openly umbilicated, whereas H. mitchellce has a covered umbilicus. 2. HELIX THATCHERI, COX. (Plate XVI. fig. 2.) Shell deeply and openly umbilicated, depressedly globose, rather solid, finely obliquely striated, dull horny yellow, ornamented with a broad, dark chestnut band below the suture, with five or six fine dark lines round the centre of the whorls, and also a dark undefined zone round the umbilicus, which is of the same colour; this dark coloration extends across the last whorl in a broad undefined band along the margin of the aperture, and joins the band beneath the suture; spire flatly conoid ; whorls 6|, flattened, the last becoming much inflated, rapidly enlarged and a little depressed in front; base flat; aperture oblong-oval, large, oblique, livid white within; lip slightly thickened and everted, of a lighter colour than the interior; margins approaching, joined by a thin dark callus ; columellar margin much dilated, half concealing the umbilicus. Hab. Mount Bersaker, Rockhampton, Queensland (Rainbirdi). Diameter-greatest 1*60, least 1*20; height 1*15 inch. An interesting species, of an intermediate form between Helix ap-pendiculata and H. incei, but easily distinguished from either by the marked inflation of the last whorl. 3. HELIX NOV^E-GEORGIENSIS, COX. (Plate XVI. fig. 3.) Shell imperforate, globosely depressed, surface corrugated and shiny, white, ornamented with 5 or 6 narrow brown bands ; apex of spire bluntly rounded ; whorls 4, rapidly increasing in size, each |
