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Show 172 DR. J. c. cox O N N E W AUSTRALIAN S H E L L S . [Mar. 24, gradually increasing in size, last depressed in front; aperture ro-tundately lunate; peristome white, expanded, margins slightly approaching ; columellar margin ivory-white, triangularly expanded and fused into the body of the shell. Diameter-greatest 0*90, least 0*73 ; height 0*74 inch. Hab. Nichol Bay, Western Australia. 7. BULIMUS SAN-CHRISTOVALENSIS. (Plate XVI. fig. 7i) Shell rimately perforate, conically ovate, club-shaped; spire elongated and proportionally slender, moderately thin, rather finely transversely malleated, pale brown, apex pink, abundantly and irregularly ornamented with triangular or irregular longitudinal zigzag markings; whorls 5, the last inflated and forming three-fourths the length of the shell; aperture elliptically oval; peristome pink, shortly expanded and very slightly thickened; columellar margin dilated and divided into two pillars-one, the larger and more highly coloured, prominent, and running spirally within the body of the shell, the second running forward toward the insertion of the opposite end of the peristome and becoming blended with a callus of union; in some specimens a tooth exists between the spiral internal pillar of the columella and the insertion of the opposite end of the peristome. Diameter 1*20, length 1*60; aperture 1*45 long, 0 60 inch broad. Hab. San Christoval, Solomon Islauds. 8. RECLUZIA HARGRAVESI*. (Plate XVI. fig. 8.) Shell imperforate, pyriform, thiu, scalariform, greenish horn-colour, shining, transversely obsoletely striated, and very indistinctly banded; whorls 6\-7, markedly rounded, and separated by a deep suture; aperture ovately rounded; peristome thin, simple; columellar margin thickened and expanded. Hab. Miall River, Port Stephens, N.S.W. Diameter-greatest 0*90, least 0*67 ; length 1*53 ; aperture 0*65 long, 0*50 inch wide. DESCRIPTION OF PLATE XVI. Fig. 1. Helix rainbirdi, p. 170. 2. Helix thatcheri, p. 170. 3, 3 a. Helix novce-georgiensis, p. 170. 4, 4 a. Helix macgregori, p. 171. 5. Helix chancei, p. 171. 6. Helix convicta, p. 171. 7. Bulimus san-christovalensis, p. 172. 8. Recluzia hargravesi, p. 172. * [Mr. H. Adams, wbo has been kind enough to look over this paper for Dr. Cox, remarks that this shell is pelagic, and was probably found at or near the mouth of the river, whither it had been driven by the winds from the sea.-ED.] |