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Rh the mouths of the Ussuri and in other parts of Amoorland. It extends into the island of Sachalin. In many districts it is not distinguished by the natives from the Tiger.

22. Felis domestica.

23. Erinaceus europæus.—A single skin obtained near Anjun, on the Amoor, proved to belong to E. europæus, or a variety amurensis, and not to the Siberian long-eared species E. auritus.

24. Erinaceus auritus.—Not observed, though probably a more northern species, and to be met with on the upper branches of the Amoor.

25. Sorex vulgaris is the commonest Shrew in Amoorland.

26. Sorex pygmæus is also found on the Amoor, and extends into Sachalin.

27. Vespertilio (Vesperus) borealis.—One example of this bat was obtained.

28. Vespertilio mystacinus.

29. Vespertilio daubentonii.—Herr von Schrenck appears to doubt the real specific difference between these closely-allied species of Vespertilio, of both of which examples were obtained on the Amoor.

30. Plecotus auritus.—One specimen obtained agrees with European examples.

31. Pteromys volans is found in the wooded districts of Amoorland, and extends over the interior of Sachalin, where it resorts to the Birch-trees (Betula ermanni).

32. Sciurus vulgaris.—Common in Amoorland, varying much in summer and winter pelage, being dark grey in winter, and dark brown, sometimes nearly black in summer. Temminck's Sciurus lis, from Japan, is considered a questionable species, as S. vulgaris extends all over Sachalin.

33. Tamias striatus.—Very common.

34. Tamias uthensis, of Pallas, is suspected to be a black variety of T. striatus.

35. Spermophilus eversmanni.—Three specimens were obtained in Amoorland of this Spermophilus, which appears to replace S. citillus, of Europe, thoughout North-eastern Asia.

36. Artomys bobac was not observed in Amoorland, but an example was obtained by Herr Maack, on the upper Amoor.

37. Mus decumanus.—The "Hanoverian Bat," as Mr. Waterton delights to call it, has occupied the whole of the Amoorland, and already extended itself into the upper portion of the territory. It probably arrived by ships on the coast first, and penetrated thence, as it is not known in Siberia, though frequent in Japan and China.

38. Mus musculus has followed its larger brother in its invasion of Amoorland.

39. Arvicola (Hypudæus) Amurensis nov. sp.—Of this new Vole one example was obtained by Herr von Schrenck, at Nicolajewsck, in September, 1854. The nearest ally seems to be A. glareolus, of Europe, of which it may be considered as the eastern representative.