Proceedings of the Linnean Society of London (Volume 18)

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1885 edition. Excerpt: ... XI. Alliance ISASTILEOIDA. Agglomerate Astraeidae, increasing by gemmation within the calice Walls of corallites fused. Occasionally the fusion is deficient near the calice or low down. Septa denticulate or entire. Tribe I. Septa denticulate. Genus Isastrjea, Ed. & H. Genus Prionastrba, Ed. & H. Genus Fi.ACASTu.KA, Stol. Genus Elysastrea, Laube. Genus Lepidophyllia, Duncan. Tribe II. With entire septa. Genus Aploccenia, Ed. & H. Genus absorbed: --Metastrjsa, Ed. & H. Tribe I. Genus Isastb.sja, Milne-ISdwards Sf Jules Haime, Hist. Nat. des Corall. vol. ii. p. 526 (1857). Colony massive, convex, gibbous, subdendroid or incrusting. Corallites prismatic, and intimately united by their walls, which are simple throughout. The calices have a polygonal outline, which is simple and ridge-like. The columella is rudimentary or absent. The septa are thin, close, granular, denticulate. Endotheca fairly well developed. The common base is marked with fascicles of costae, and has a thin epitheca. Gemmation calicinal and submarginal. Occasionally the calicular walls are slightly apart near the calice. Distribution.--Fossil. Trias: Europe. Infra-Lias, Lias, Oolites: England and Europe. Cretaceous: England, Europe, India. Eocene: Europe, India (Sind). Miocene: West-India Islands. Genus Peionastba, Milne-Edwards fy Jules Haime, Hist. Nat. des Corall. vol. ii. p. 513, pi. D 8. fig 1 (1857). Syn. Metastrcea, Ed. & H.. Colony large, massive, convex, with or without ascending lobes, subplane, hemispherical, gibbous. Corallites close, prismatic; their walls are united above but usually not below. Calices polygonal and deep, or not large; margins simple or in crests. Columella spongy, variable in development. Septa thin, narrow above, close, granular, and very...