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Nottingham District," (Sheet 71, N.E.,) he either did not observe this conglomerate at all, or mistook it to belong to the Bunter, for he mentions a less important conglomerate, about 16ft. higher up in the Keuper, but says nothing about the conglomerate at the bottom. This second conglomerate is well exposed in the section in Turner Street, also in the open ground at Belle Vue Terrace, at the top of Calcutta Street. Its maximum thickness is 12in., and it consists of small white and pink sub-angular quartz pebbles, flakes of fine red marl, pebbles of pink and white limestone, fine-grained light green sandstone, and bits of rock embedded, in one spot in calcareous fine yellow sand, in another in Indeed, I found quartz pebbles calcareous greenish-white sandstone, distributed more or less throughout the lower beds of the Keuper sandstone along Blue Belle Hill.

With regard to the origin of the conglomerate forming the base of the Keuper, it is, of course, well not to attempt to draw conclusions in geology from too limited an area. There can be no doubt, however, that in this conglomerate, with its associated irregularly-stratified beds of sandstone, we have the remains of an ancient sea-beach the shore of the sea in which the Keuper sandstone and clay were deposited. The pebbles composing the conglomerate are all such as may be seen in the underlying Bunter the partially consolidated sandstone is easily recognised as Bunter sandstone that has been bleached, then re-deposited, and subsequently tinged with colouring matter. We know that the Bunter sandstone formed the land surface over a large part of England during what was probably a long interval, while the Muschelkalk of Germany was being deposited. Thus the conglomerate probably represents a great break in time in this part of England and the fact that the plane of Bunter on which the conglomerate rests is inlined at a greater angle than the dip of the Bunter, as far as that dip can be ascertained, leads me to infer that the old Bunter land was gradually submerged from an easterly direction, during which the pebbles which probably more or less covered the land-surface came to be re-deposited and cemented with carbonate of lime and magnesia, and partially interstratified with bleached sand derived from the receding shore line.

Passing to the second order, which is named Copepoda, we select for description the well-known Cyclops quadricornis. A lively female specimen, let us suppose, with egg-sacs attached, is, after repeated attempts with the dipping-tube, at length safely landed in the live-box. What is she like? We observe that the carapace is made up of many parts corresponding to the segments of the body. Four segments compose the thorax, the first, with which the head is consolidated, being very large. The abdomen counts six rings, and terminates in a forked tail. Standing out conspicuously from the head are two pairs of antennas, each of the larger being made up of numerous joints, and all four armed with bristles. The mouth has a pair of strongly toothed mandibles, besides a first and second pair of foot-jaws, between which and the antennae the breathing function appears to be divided. There are five pairs of feet, the four pairs useful for locomotion springing from the four divisions of the thorax. Each foot is itself double, and all are thickly furnished with