A guide to the fossil invertebrate animals in the Department of geology and palaeontology in the British museum (Natural history) . he collections from the Inferior Oolite are richer, and the Table-easerepresentatives of modern genera are increased by Fungians, ^•such as TJiamnastraea, and also by a doubtful species (Fig. 24 a)representing the confluent Astraeids, in which the polypsand calyces are incompletely separated as in the Brain-coral. In the rocks of Bathonian age are many corals ofsimilar type, the chief reef-builder being Calamop)]iyllaradiata. In the Corallian rocks true reefs are
A guide to the fossil invertebrate animals in the Department of geology and palaeontology in the British museum (Natural history) . he collections from the Inferior Oolite are richer, and the Table-easerepresentatives of modern genera are increased by Fungians, ^•such as TJiamnastraea, and also by a doubtful species (Fig. 24 a)representing the confluent Astraeids, in which the polypsand calyces are incompletely separated as in the Brain-coral. In the rocks of Bathonian age are many corals ofsimilar type, the chief reef-builder being Calamop)]iyllaradiata. In the Corallian rocks true reefs are formed of Table-easeThecosmilia, Thamnastraea, and Isastraea, of which large 2-specimens are shown (Fig. 25). The structure of all these Wall-easeJurassic corals, as of the succeeding Cretaceous and Tertiary ^•genera, can be gathered from the diagrams placed in theTable-cases. An interesting series is that of Isastraea oUonga, 56 GUIDE TO THE FOSSIL INVEETEBRATE ANIMALS. Gallery X. from the Portlandian of Portland and Tisbury, showing howTable-ease the skeleton of the coral has been converted into chert invarying
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Keywords: ., bookauthorbr, bookcentury1900, bookdecade1900, booksubjectfossils
