. Transactions and proceedings of the New Zealand Institute . cavity deep, smooth, conical ; columella with a slight posterior fold. Height #84 inch; breadth *84 inch. This species has the smooth axial cavity of A. tiarata, but it is larger,higher, the granulations finer, and the basal angle much more rounded. Note.—In addition to these new species there was in the collection aspecimen of what I take to be Siphonaria fuscozonata, Angas (, 1865,p. 56), which appears to be the same as Fusus minutisquamosus, Keeve. Art. L.—Note on the Silt Deposit at Lyttelton. By Prof. F. W. H
. Transactions and proceedings of the New Zealand Institute . cavity deep, smooth, conical ; columella with a slight posterior fold. Height #84 inch; breadth *84 inch. This species has the smooth axial cavity of A. tiarata, but it is larger,higher, the granulations finer, and the basal angle much more rounded. Note.—In addition to these new species there was in the collection aspecimen of what I take to be Siphonaria fuscozonata, Angas (, 1865,p. 56), which appears to be the same as Fusus minutisquamosus, Keeve. Art. L.—Note on the Silt Deposit at Lyttelton. By Prof. F. W. Hutton. [Read before the Philosophical Institute of Canterbury, 6th April, 1882.]In cutting back the hill on the west side of Lyttelton Harbour to make roomfor the dock, an excellent section has been exposed of the silt deposit andthe rocks underlying it. An uneven surface of volcanic rocks is covered bythe silt, which is distinctly stratified, and dips at an angle of 8 degrees tothe north-east, that is towards the harbour. In 1878 the cutting behind the. Fig. 1. a, silt deposit; b, volcanic rocks. 412 Transactions.—Geology. railway station also showed that the silt was stratified, but this section isnow obliterated by weathering, and I have thought it important to call theattention of geologists to the section behind the dock while it is still fresh;for no doubt it will soon become obliterated like the one behind the railwaystation. The origin of this silt deposit is of considerable interest, as it is im-portant evidence in discussing the question of the latest oscillations of levelin New Zealand. Dr. von Haast, in his Eeport on the Geology of Canter-bury and Westland (1879), p. 367, calls it The Loess Formation, com-pares it with the loess deposits of China described by Baron von Kichthofen,and says that the general character and position of the principal loess (orloam) beds in this province prove clearly that they have been formed by themodus operandi pointed out by Von
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