In Mr. Turnbull's collection from the Sholeshook Limestone of the Sholeshook Railway Cutting there is a small but perfect ‘horse-shoe’ limb of a species of Hiarpes—a genus which has not been previously recorded from this bed. The ‘horse-shoe’ is oval and rather elongate, and narrow in proportion to its length; the arms curve inwards gently, so that their acutely pointed posterior extremities are approximate. There seems to be a marginal, single row of large pits round the outer edge of the flattened limb, but the general surface is covered with very minute punctae. The inner edge of the limb is not well preserved. The arms extend backwards to about twice the length of the head-shield.

Lightning Creek occupies a wide valley in a weakened zone in the series of rocks known as the Cariboo schists. It has been stated by Mr. Bowman (Canadian Geological Survey, 1885 and 1886), and confirmed by later observations, that the centre of the deepest known erosion follows very closely the anticlinal axis in these schists. The occurrence of the very rich spots for which this stream is justly famous, both below its present level and at points many feet above it, have long been a source of discussion amongst the miners who worked here. It is hoped these notes gathered during three years studying this difficult problem may be of assistance to future observers, and perhaps lead to the discovery of rich benches in hitherto unsuspected places.

The following petrographical notes refer to examples of igneous rocks collected by the writer during a visit to the Transvaal in the Summer of 1904. Thin sections of the rocks have since been made, and it was thought the following condensed accounts of their appearances might perhaps prove a useful record.

Lying in the heart of the gold belt known as the Barkerville District, Hardscrabble Creek was discovered by the pioneer prospectors in 1867, and has ever since been noted for the number of heavy minerals associated with the gold. Galena and various iron minerals were recognized, but the most troublesome was a heavy white substance, which caused great trouble to the miners by packing in the sluice-boxes so tightly that the gold was carried over the firmly set particles by the amount of water required to keep the riffles clean. An investigation by an economic geologist of high standing of some lumps of the alleged mineral showed it to be barium sulphate, and no examination was made of the smaller particles.