Abstract
Occurrence. The foraminifera here described were found in a shaly limestone which Prof. Groom obtained —from the débris of a small ridge composed of black shales, with intercalated basalts, which forms a spur on the north-west side of Chase End Hill. The locality is a short distance south of the village of Whiteleaved Oak. In the same specimens of limestone were found traces of Oboloid brachiopoda, and of what appear to be minute gasteropoda, bivalved crustacea or mollusca, and other fossils. The rock belongs to the well-known and widely-spread zone of Sphærophthalmus, Peltura , and Ctenopyge , which in Britain forms the upper half of the Dolgelly Beds or Upper Lingula -Flags.— 1 So far Prof. Groom has been unable to find the rock in place, although there can be no doubt, he informs me, that it occurs not many yards away from the spot where it is now found. On examining the limestone with a pocket-lens, Prof. Groom noticed a number of small bodies, some of which, when looked at under a high power, had the appearance of foraminifera. Thereupon a thin slice of the rock was prepared, which revealed to him the presence of undoubted foraminifera. The specimens, courteously placed in my hands by Prof. Groom for description, have been sliced; and they have yielded a few forms other than Spirillina , which was the first one seen. Some pieces of the limestone are dark or nearly black, while others are whitish and speckled over with minute dark-blue spots. When thin sections of

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