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PLATE VI. Pago. Tracliypora Wilkinsoni, Eth. fil. ... ... ... ... 26 Pig. 1. Vertical microscopic section, showing the dense secondary peripheral deposit, the axial filled-up corallites, with portions of their median lines left open, and crossed by tabulae, x. 4. Fig. 2. Similar horizontal section with the sclerenchyma of the axial corallites well marked, leaving in most cases a small central space; and the peripheral corallites gradually bending over to their more or less horizontal position, as evinced by their oblique section, with great thickening of their walls, x. 4. Stenopora crinita, Lonsdale ... ... ... ... 49 Fig. 3. Horizontal microscopic section, exhibiting the polygonal corallites, with alternate light and dark concentric rings of secondary sclerenchyma, developed in a greater or less degree, x. 7. Fig. 4. Similar section, exhibiting the primordial wall, lining of secondary deposit, and acanthopores at the corallite angles, x. 15. Fig. 5. Another section, showing the fibro-concentric structure of the partially-thickened walls and the triangular young corallites at the calice angles, x. 50. Fig. 6. Vertical microscopic section of a few tubes exhibiting a line of moniliform con strictions and the long expanse of simple tubes without tabula', x. 8, x. 8. Stenopora ovata, Lonsdale ... ... ... ... 55 Fig. 7. Vertical peripheral microscopic section exhibiting tabula and the walls partially thickened, x. 9. Fig. 8. Vertical microscopic section from immediately below the surface showing the peculiar form assumed by the moniliform swellings of this species, x. 12. Figs. 1, 2, from Mulbring. 3, 7, 8, „ Singleton. 4, 5, 6, „ Wollongong. N.B.—The enlargements are approximate.