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Show 1871.] DR. J. ANDERSON ON RODENTS FROM YARKAND. 559 of the foot, is inserted into the base of the first phalanx of the digit, previously joining the common extensor tendon. This muscle has the same arrangement in the Dog, Caracal, and Paradoxurus typus. It is a muscle not unfrequently found in the human subject-seldom, however, in the complete form above described, but as a tendinous offset from the peronaeus brevis, and usually described as the peronaeus quinti. The interossei present no essential differences from those described in the manus. The plantar are two in number, and arise from the sheath of the peronaeus longus and ectocuneiform bone. The dorsal interossei are six in number, and arranged as in the hand. 2. Notes on some Rodents from Yarkand. By J O H N A N D E R S O N , M.D.,F.L.S.,F.Z.S., Curator of the Indian M u s e n m, Calcutt a. [Eeceived June 5, 1871.] Having lately received examples of Arctomys bobac, A. hemachalanus, Lagomys curzoniee, and Lepus tibetanus from the country travelled over by the late Expedition to Yarkand, under Mr. Forsyth, I propose to describe them and to record a few facts regarding them, as they are species of rather rare occurrence and not very well recognized. Arctomys bobac was figured and redescribed in 1841 by Hodgson * as a new species, and named A. himalayanus. Two years afterwards he again described it, along with another form, A. hemachalanus, to which I shall presently refer, and spoke of the former as the A. himalayanus of his Catalogue, but as " potius tibetanus hodie," In this account he says, " I cannot doubt that the above two species are distinct." Horsfield f in 1851 correctly referred A. himalayanus to A. bobac, but, in a footnote, referred to Hodgson's second paper, and made that naturalist describe an A. tibetanus and A. himalayanus as distinct, which he had never done, these two terms having been applied by him to one form, and the other, A. hemachalanus, restricted to another species. Blyth, in his Catalogue of Mammalia %, includes these two species under A. bobac, and states that he could not discriminate them in the skins and skulls before him, which is not remarkable, as these all belonged to typical A. bobac. Adams §, however, was aware of two forms, but separated A. himalayanus (tibetanus) from A. bobac; and Dr. Jerdon || mentions that he is inclined to accept them, as Hodgson insisted on their distinction and because he had himself seen skins in Darjeeling which inclined him to consider A. hemachalanus a distinct * Journ. As. Soc. x. p. 777 (cum fig.), ibid. xii. p. 409. t Catalogue of Mamm. in India-House Museum, Lond. p. 164. % Cat. of Mamm. in Museum of As. Soc. Beng., p. 108. § Proc. Zool. Soc. 1858, p. 528. || Mammals of India, p. 182. |