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Show \ Page H U D S O N , W I L L I A M H., C.M.Z.S. Tenth Letter on the Ornithology of Buenos Ayres 4 Eleventh Letter on the Ornithology of Buenos Ayres .... 258 Twelfth Letter on the Ornithology of Buenos Ayres 326 KENT, W. SAVILLE, F.Z.S., of the Geological Department, British Museum. On some new and little-known Species of Madrepores, or Stony Corals, in the British-Museum Collection. (Plates XXIII.-XXV.) 275 On a new Genus of Sponges from North Australia. (Plate XLVIII.) 615 KREFFT, GERARD, C.M.Z.S. Letter from, containing notices of rare Australian Whales of the Genera Dioplodon and Ziphius 630 M A C D O N A L D , Professor. Exhibition of Specimens of the Cranial Bones of Fishes .. 547 MIVART, ST. GEORGE, F.R.S., F.Z.S., Lecturer on Comparative Anatomy at St. Mary's Hospital. On Hemicentetes, a new Genus of Insectivora, with some Additional Remarks on the Osteology of that Order. ( Plate V.) 58 MOORE, FREDERIC, WALKER, FRANCIS, and SMITH, FREDERICK. Descriptions of some new Insects collected by Dr. Anderson during the Expedition to Yunan. (Plate XVIII.) 244 MURIE, JAMES, M.D., F.L.S., F.G.S., late Prosector to the Society. Additional Notice concerning the Powder-Downs of Rhinochetus jubatus, &c g j j |