On the Astrocœniæ of the Sutton Stone and other Deposits of the Infra-Lias of South Wales

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Abstract
A very well-preserved specimen of Astrocoenia gibbosa , nobis, has lately eometo handwhich was collected bythe lateE. B. Tawney, Esq., F.G.S., and as it illustrates many interesting points in regard to the morphology of the Species, I have thought that a description of it would be interesting to those Fellows of the Society who take an interest in the Madreporaria of the Jurassic strata. The specimen is gibbous and worn on the free surface, and it has been carefully cut transversely and polished at the distance of an inch from the top. The form has grown vigorously in some parts and more slowly in others, and there are quite young as well as old corallites to be observed in the colony. Except in one or two places, fossilization has not interfered with the perfect preservation of the structural details, and the originally hard parts of the coral are represented by dense white mineral, while the interspaces are filled with more or less transparent, dark, carbonate of lime. On one side of the specimen and on the upper surface close by, are some corallites, which, as they are characteristically Astroccenian, may be noticed first of all. On the side of the colony the corallites have been worn so as to show longitudinal views of their walls and septa (P1. VIII. fig. 1). The walls of adjacent eorallites are united, and it is only in one or two places that a very thin line of semitransparent calcite denotes that the fusion has been incomplete.

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