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 Wesotragus of Kast 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 Kast- 
African Nesotragus, and practically reduces the distinguishing 
characters to those of the horns alone. 
The horns of Veotragus are very small, practically smooth, and 
laid back on the head in a plane with the forehead; while those 
of Vesotragus 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 Hxpedition” to the Malay Peninsula in 1899— 
1900. By E. R. Syxgs, F.Z.S. 
[Received February 2, 1903. ] 
(Plate XX,") 
The species of Land-Mollusks collected by the “Skeat Expedi- 
tion,” 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 :— 
LEPTOPOMA ASPIRANS Benson. 
Leptopoma aspirans Benson, Ann. Nat. Hist. ser. 2, vol. xvii. 
p. 229. 
Hab. Biserat, Jalor. It has been recorded from Bukit 
Pondong and the Kinta Valley, having been originally described 
from Tenasserim. 
LAGOCHILUS KOBELTI, sp. nov. (Plate XX. figs. 13-15.) 
Testa modice wmbilicata, turbinata, solidula, lirulis numerosis 
cincta, periostraco brunneo leviter induta; spira conica ; 
anfr. 54, conveai ; apertura modice obliqua, subcircularis, pert- 
stomate duplici, incrassatulo et subrefleco, juxta insertionem 
breviter sed distincte inciso. Alt. 6:8; diam. max. 7:0 millim. 
Hab. Biserat, Jalor. i 
1 For explanation of the Plate, see p. 199. 
