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Show 422 MR. R. LYDEKKER ON THE [Apr- 6, 6. URSUS ARCTUS MIDDENDORFFI.-Kadlak Brown Bear. Ursus middendorffi,, Merriam, Proc. Biol. Soc. Washington, vol. x. p. 69 (1896). Although closely allied to the preceding, which it somewhat exceeds in size, and thus the largest living member of the group, tbe Bear of Kadiak Island, Alaska, is, I consider, rightly separated by Dr. Merriam. I have not seen a skull, but it appears, from his figures and description, that in adult males the frontal region is enormously elevated, highly arched, and relatively narrow ; the zygomatic arches enormously wide, and the postzygomatic region very short. There appears to be no concavity at the root of the nasals ; and the great elevation of the frontal region seems most conspicuous in sub-adult examples. Merriam gives a number of minor characters distinguishing the skulls of the two forms, which need not be recapitulated here. It is stated that in the adult female the skull is relatively more elongated and the frontal region less elevated than in the male. The front claws are long and considerably curved. I presume that Dr. Merriam bad definite knowledge of the sex of the skulls of the Kamschatkan Bear with which he makes comparison. Those in the British Museum are not determined, and if they be females a question might arise whether this form is really distinct from the preceding. The characters of the fourth lower premolar are not given. 7. URSUS ARCTUS YESOENSIS, subsp. nov.-Yezo Brown Bear. M y attention has been directed by Mr. Thomas to three skulls from Yezo, the northern island of Japan, in the British Museum, which differ so remarkably from any others I have seen as to Fi«?. 3. Profile view of sub-adult skull of Ursus arctus yesoensis. indicate a distinct form. They comprise a half-grown, a sub-adult (no. 86.11.18.2), and a fully adult specimen (no. 96.4.27.1). Compared with skulls of similar age of the Kamschatkan form, which |