A guide to the fossil invertebrate animals in the Department of geology and palaeontology in the British museum (Natural history) . Fig. 25.—Zoantharian Corals of Upper Corallian Age, from , Isastrxa explanata; b, Thecosmilia annularis. Natural size. (FromPrestwiclis Geology.) (See Table-case 2.) Table-cases In the Cretaceous Epoch, corals were scarcer in1 & 2. , England, for the conditions were less favourable to theirgrowth. The faunas from the lower rocks are in Table-case 2,those from the upper rocks in Case 1. From the LowerGreensand comes Holocystis chgans, once regarded as th

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A guide to the fossil invertebrate animals in the Department of geology and palaeontology in the British museum (Natural history) . Fig. 25.—Zoantharian Corals of Upper Corallian Age, from , Isastrxa explanata; b, Thecosmilia annularis. Natural size. (FromPrestwiclis Geology.) (See Table-case 2.) Table-cases In the Cretaceous Epoch, corals were scarcer in1 & 2. , England, for the conditions were less favourable to theirgrowth. The faunas from the lower rocks are in Table-case 2,those from the upper rocks in Case 1. From the LowerGreensand comes Holocystis chgans, once regarded as theonly Eugose coral of later age than Palaeozoic. In spite,however, of its four-rayed symmetry, it is now regarded as anormal Astraeid. In the Gault and Chalk, the principal corals are small,simple forms, for the mud of the former, and the cold depths Fig. 26. - Zoantharian corals fromthe British Chalk. a and c areMadreporaria Aporosa : a, SynheliaSharpei; c, Parasmilia is a Perforate Madreporarian,Stephanophyllia Bowerhanki. (From Prestwichs Geo-logy-) (See Table-case 1.)

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