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Show 1871.] DR. J. MURIE ON RHINOCHETUS JUBATUS. 647 Hab. Guadalcanar Island, Solomon Islands. Closely allied to H. ladiflua and H. isabellensis; but this species has a large, deep, open, umbilicus. HELIX BELMOREI, sp. nov. (Plate LII. fig. 12.) Shell with a large open umbilicus, broadly trochiform, rather solid, opaque, obliquely finely irregularly striated, dark chestnut; whorls 6|, flat; suture very indistinct; spire bluntly conoid ; the last whorl very sharply keeled, not depressed in front; base flat, more coarsely striated than above with a few irregular longitudinal striae ; excavated round the umbilicus ; aperture trapezoid ; peristome sharply angled and pointed at the keel, white and thickened towards the columellar margin, which is scarcely expanded. Diam., greatest 1*00, least 0*90; height 0*50 of an inch. Hab. Solomon Islands. HELICINA JANA, sp. nov. (Plate LII. fig. 13.) Shell conoid, rather solid, of a dull orange-brown colour, very finely irregularly transversely striated; apex pointed and finely spirally striated; whorls 4 | to 5, flat, last bluntly keeled; aperture triangular, rounded at the angles; base rounded, half covered with a thin, expanded, white callus; peristome thickened, white, continuous with the columella, which gradually expands out into the callus, partially covering the base. Diam., greatest 0*17, least 0*14 ; height 0*16 of an inch. Hab. Port Macquarie, east coast of Australia ; found under leaves on the ground. DESCRIPTION OP PLATE LII. Figs. 1, la. Voluta (Amorid) austr a-lice, p. 643. 2. Partula peasei, p. 644. 3. Bulimus sellersi, p. 644. 4. Helix andersoni, p. 644. 5. scandens, p. 645. 6. kempseyensis, p. 645. Fig. 7. Helix macquariensis, p. 645. 8. guadalcanarensis, p. 645. 9. sellersi, p. 646. 10. compluviatus, p. 646. 11. hunteri, p. 646. 12. belmorei, p. 647. 13. Helicina jana, p. 647. 7. Additional Notice concerning the Powder-Downs of Rhinochetus jubatus. By JAMES MURIE, M.D., F.L.S., F.G.S., &c, late Prosector to the Society. (Communicated by Prof. N E W T O N , F.R.S.) [Received October 19, 1871.] In my memoir on the Kagu, Sun-bittern, and Boatbill, read in 1867, but only published by the Society this year, I enter at some length into the nature of the plumage of these aberrant types. After a somewhat complicated study of the powder-downs, their structure, situation, and mode of examination, I propose a set of terms as expressive of their distribution consonant with Nitzsch's |