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Show 472 MR. R. LYDEKKER ON [Nov. 3, we may first mention the right humerus from Tavolara represented in figs. 7,7 a of the Plate. This agrees in all respects with the corresponding bone of a recent Hawfinch (Coccothraustes vulgaris), and may be confidently referred to that widely-spread European species. A right tibio-tarsus from the same locality is probably also referable to this bird. Three smaller humeri, from Monte San Giovanni, appear to be referable to the Bullfinch (Pyrrhula europcea), which now occurs in many parts of Italy, occasionally reaching as far south as Sicily. Three other humeri, of a more slender type, come very close to those of the Chaffinch (Fringilla ccelebs), although slightly larger than in existing examples ; these bones are from Tavolara. Two considerably smaller humeri of a Finch from the same locality may prove to belong to the Serin (Serinus hortulanus), now so common in Italy. Alaudidce.-The humerus of the Larks is readily distinguished from that of the Finches by the very slight development of the tricipital fossa, which forms a mere shallow depression quite distinct from the subtrochanteric fossa. Such a type of humerus is presented by the specimen of the right side from Monte San Giovanni represented in figs. 9, 9 a of the Plate. Since this bone is somewhat smaller than the humerus of Alauda arvensis, I think it not improbable that it may belong to A. arborea. A humerus from a breccia at Montmorency figured by A. Milne-Edwards, 'Rech. Oiseaux Foss. de la France,' pi. 156. figs. 22, 23, and referred to A. cristata, is of the size of that of A. arvensis, its characters being exactly those of the present example. Sylviidce.-Some small humeri in the collection not improbably indicate members of this family, although I have been unable to determine them even generically. Turdidce.-In this family the humerus is intermediate in character between that of the Fringillidce and that of the Alaudidce, having well-developed tricipital and subtrochanteric fossae, separated from one another by a complete bony septum. These characters are shown in the right humerus from the breccia of Monte San Giovanni represented in figs. 8, 8« of the Plate. This specimen has a length of 0,0265, aud is rather larger than the corresponding bone of Monticola cyanus figured in Milne-Edwards's 'Rech. Oiseaux Foss. de la France,' pi. 149. fig. 16. The left tibio-tarsal and tarso-metatarsus from Tavolara, represented in figs. 6, 6 a of the Plate, may belong to the same kind of Thrush. The humerus differs from that of Monticola cyanus not only by its larger size but by the lesser development of the delto-pectoral crest. In the form of the latter, as well as in absolute size, it agrees so closely with the corresponding bone of Turdus musicus that it may be at least provisionally referred to that species. A larger representative of the Turdidce is represented by nine humeri and four other bones from the breccia of Toga, Corsica. The number of the humeri appears to indicate a gregarious species. One of these humeri, of the right side, is represented in woodcut 2, and has a length of 0,0295. Unfortunately I have had no opportunity of comparing this specimen with a humerus of Turdus merula. It is, |