A monograph of the British fossil corals - kreidefossilien.de
A monograph of the British fossil corals - kreidefossilien.de
A monograph of the British fossil corals - kreidefossilien.de
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INTRODUCTION.<br />
Ixxi<br />
or costal radii <strong>of</strong> <strong>the</strong> neighbouring coralHtes, being confluent, and consequently <strong>the</strong> calices<br />
not being <strong>de</strong>finitely circumscribed. No exterior ivalls ; <strong>the</strong> interior mural investment<br />
well characterised. The centre <strong>of</strong> <strong>the</strong> tahulcB presenting a columellarian tubercle.<br />
Typ. sp., PhiUipsustrea Tlennahi, D'Orbigny, loc. cit. ; Astrea Hennahi, Lonsdale, in Geol. Trans.,<br />
2d series, vol. v, tab. Iviii, fig. 3.<br />
27. Genus Eridophyllum.<br />
Corallum composite, and increasing by lateral gemmation. CoralUtes tall, cyiindroid,<br />
and provi<strong>de</strong>d with a thick epi<strong>the</strong>ca, which gives rise to a vertical series <strong>of</strong> short and thick<br />
subradiciform productions that extend to <strong>the</strong> next individual and unite <strong>the</strong>m toge<strong>the</strong>r.<br />
Tabula well <strong>de</strong>veloped, and occupying <strong>the</strong> central area circumscribed by <strong>the</strong> inner<br />
wall. Septal apparatus occupying <strong>the</strong> annular area situated between <strong>the</strong> outer and inner<br />
mural investment, but not extending into <strong>the</strong> inner or central area.<br />
Typ. sp., Eridophyllum seriale, nob.<br />
Third Tribe—LITHODENDRONIN^.<br />
Axis <strong>of</strong> <strong>the</strong> visceral chamber <strong>of</strong> <strong>the</strong> corallites occupied by a styliform or lamellar<br />
columella.<br />
28. Genus Litho<strong>de</strong>ndron.<br />
Phillips, Geol. <strong>of</strong> Yorkshire, vol. ii, p. 200, 1835 (but not Lilho<strong>de</strong>ndron <strong>of</strong> Schweigger, which is not an<br />
admissible genus); Siphono<strong>de</strong>ndron, M'Coy, in Ann. and Mag. <strong>of</strong> Nat. Hist., 2d series, vol. iii, 1849.<br />
Corallum composite, arborescent, or massive. Corallites cylindrical or prismatic-<br />
Columella styliform, compact. Sejjta well <strong>de</strong>veloped, but not reaching to <strong>the</strong> columella.<br />
Tabula well <strong>de</strong>veloped. Interior wall rudimentary.<br />
Typ. sp., Litho<strong>de</strong>ndron irregulare, Phillips, loc. cit., pi. ii, figs. 14, 15.<br />
29. Genus Nematophyllum.<br />
Nematophylhtm and Stylaxis, M'Coy, loc. cit., 1849.<br />
Corallum composite, massive. Corallites prismatic, with a well-<strong>de</strong>veloped interior<br />
wall. Columella lamellar. Septa well <strong>de</strong>veloped, and united by transverse dissepiments,<br />
which extend to <strong>the</strong> columella, but do not constitute true tabulae. Exterior area<br />
vesicular.<br />
Typ. sp., Nematopliylbim arachnoi<strong>de</strong>um, M'Coy, loc. cit., p. 16.