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
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
.<br />
Iviii<br />
BRITISH FOSSIL CORALS.<br />
instead <strong>of</strong> occupying only <strong>the</strong> one or two loculi. It is also to be remembered that <strong>the</strong><br />
septal apparatus, although more or less rudimentary, has <strong>the</strong> same general mo<strong>de</strong> <strong>of</strong><br />
arrangement as in <strong>the</strong> preceding sub-or<strong>de</strong>rs, and never presents <strong>the</strong> crucial character which<br />
we shall find in Zoantharia rugosa<br />
This section comprises four families : Favositidse, Milleporidae, Seriatoporidse, and<br />
Thecidae.<br />
Family VIII.<br />
MILLEPORID^.<br />
Corallum principally composed <strong>of</strong> a very abundant coenenchyma, distinct from <strong>the</strong><br />
walls <strong>of</strong> <strong>the</strong> corallites, and <strong>of</strong> a tubular or cellular structure. Septa not numerous ;<br />
tabular numerous, and well formed.<br />
1. Genus Millepora.<br />
{Pars) Lamarck, Syst. <strong>de</strong>s An. sans Vert., p. 373, 1801 ; Palmipora, Blainville, Diet, <strong>de</strong>s Sc. Nat., t. Ix,<br />
p. 3.'")6, 1830.<br />
Corallum <strong>of</strong> various forms, but more or less foliaceous. Coenenchyma extremely<br />
abundant, <strong>of</strong> an irregular subtubular structure. Calices <strong>of</strong> very different dimensions in<br />
<strong>the</strong> same corallum. No distinct septa. Tabula horizontal.<br />
Typ. sp., Millepora alcicorrds, Lamarck, loc. cit. ; Milne Edw., Atlas du Regne Anim. <strong>de</strong> Cuvier,<br />
Zooph., tab. Ixxxix, fig. 1.<br />
2. Genus Heliopora.<br />
{Pars) Blainville, Diet, <strong>de</strong>s Sc. Nat., vol. Ix, p. 357, 1830; Dana, Zooph., p. 539, 1846.<br />
Corallum lobulate, somewhat massive, and differing from MiUepora by <strong>the</strong> regular<br />
tubular structure <strong>of</strong> <strong>the</strong> coenenchyma, and <strong>the</strong> existence <strong>of</strong> small but distinct septa.<br />
Typ. sp., Heliopora ccert<strong>de</strong>a, Blainville, loc. cit., p. 357.<br />
3. Genus Hbliolites.<br />
Dana, Zooph., p. 541, 1846 ; Palesopora, M'Coy, Ann. and Mag. <strong>of</strong> Nat. Hist., 2d series, vol. iii, p. 129,<br />
1849; Geoporites, D'Orbigny, Prodr. <strong>de</strong> Palseont. stratif. Uuivers., t. i, p. 49, 1849.<br />
Corallum sub-globose. Canenchjma regularly tubular. Septal radii advancing<br />
almost to <strong>the</strong> centre <strong>of</strong> <strong>the</strong> visceral chamber on <strong>the</strong> upper surface <strong>of</strong> <strong>the</strong> tabulce, which<br />
are horizontal.<br />
Typ. sp., Heliolites pyriformis, Dana, loc. cit., p. 542 ; Heliolite pyriforme, etc., Guettard, Mem. sur<br />
les Sc. et les Arts, vol. Hi, pi. x.\ii, figs. 13, 14.