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Show 194 MR. E. R. SYKES ON [Mar. 3, An examination of the skull somewhat modifies the definition of the genus as laid down in ‘ The Book of Antelopes' by Sclater and Thomas; for in this new species are found extra maxillo-premaxillary vacuities 9 mm. long and 3 mm. broad, very similar to those found in the genus Nesotragus of East Africa. The horns again of the members of this genus cannot be said to be " less than the diameter of the eye" in length; for the horns of the type of this new species, in their broken state, are longer than the diameter of the orbital cavity, and would undoubtedly measure half as much again in their perfect state. These horns are not " perfectly smooth," but show slight ridges or rings in their basal portion. The skull is otherwise fairly similar to that of the Royal Antelope. There can be no doubt that Bates' Pigmy Antelope somewhat bridges over the differences between this genus and the East- African Nesotragus, and practically reduces the distinguishing characters to those of the horns alone. The horns of Neotragus are very small, practically smooth, and laid back on the head in a plane with the forehead ; while those of Nesotragus may be half as long as the head or more, strongly and closely ridged and directed upwards. 2. On the Land Operculate Mollusca collected during the " Skeat Expedition" to the Malay Peninsula in 1899- 1900. By E. R. S y k e s , F.Z.S. [Received February 2, 1903.] (Plate X X .1) The species of Land-Mollusks collected by the " Skeat Expedition," though not very numerous, are of considerable interest on account of the welcome addition made to a fauna which is as yet but little known. They include :- L eptopoma aspirans Benson. Leptopoma aspirans Benson, Ann. Nat. Hist. ser. 2, vol. xvii. p. 229. 11ab. Biserat, Jalor. It has been recorded from Bukit Pondong and the Kinta Valley, having been originally described from Tenasserim. L agochilus kobelti, sp. nov. (Plate XX. figs. 13-15.) Testa modice umbilicata, turbinata, solidula, lirulis numerosis cincta, periostraco brunneo leviter induta; spira conica; anfr. 5|, convexi ; apertura modice obliqua, subcircular is, peri-stomate duplici, incrassatulo et subrejlexo, juxta insertionem breviter sed distincte inciso. Alt. 6*8 ; diam. max. 7*0 millim. Hub. Biserat, Jalor. 1 For explanation of the Plate, see p. 199. |