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 />
kvii<br />
7. Gejius Hallia.<br />
Corallum tall, turbinate. Septa highly <strong>de</strong>veloped, and extending to <strong>the</strong> centre <strong>of</strong> <strong>the</strong><br />
tabulae. No columella. One remarkably large primary septum occupying <strong>the</strong> place <strong>of</strong> <strong>the</strong><br />
septal fossula, and <strong>the</strong> neighbom-ing septa directed towards it, so as to assume a pinnate<br />
arrangement ; <strong>the</strong> septa belonging to <strong>the</strong> two o<strong>the</strong>r systems presenting <strong>the</strong> usual regular<br />
radiate position.<br />
Typ. sp.,<br />
Hallia insignis, nob.<br />
8. Gejins Aulacophyllum.<br />
Corallum resembling Hallia by <strong>the</strong> mo<strong>de</strong> <strong>of</strong> arrangement <strong>of</strong> <strong>the</strong> septa, but having <strong>the</strong><br />
septal fossula not replaced by a primary septum, and affecting <strong>the</strong> form <strong>of</strong> a narrow groove,<br />
at <strong>the</strong> bottom <strong>of</strong> which <strong>the</strong> septa <strong>of</strong> <strong>the</strong> two adjoining systems meet, and even cross each<br />
o<strong>the</strong>r.<br />
Typ. sp., Aulacophylhtm sidcatmn ; Caninia sulcata, D'Orbigny, Prod, <strong>de</strong> Paleont., vol. i, p. \Kt.<br />
9. Genus Trochophtllum.<br />
Corallum simple, trochoid. Calice ra<strong>the</strong>r shallow. Septal fossula rudimentary, and<br />
occupied by a small septum. The o<strong>the</strong>r scpfa thick, not <strong>de</strong>nticulate, presenting a regular<br />
radiate mo<strong>de</strong> <strong>of</strong> arrangement, and extending almost to <strong>the</strong> centre <strong>of</strong> <strong>the</strong> visceral chamber,<br />
where a small tabula is visible.<br />
Typ. sp.,<br />
Trochophylhim Verneuili, nob.<br />
10. Genus Hadrophylltjm.<br />
Corallum short. Calice superficial. One very large septal fossula, and three small<br />
ones, representing a cross. The radiate arrangement <strong>of</strong> <strong>the</strong> septa somewhat irregular.<br />
Typ. sp., Hadrophyllum Orhignyi,<br />
nob.<br />
11. Genus Combophtllum.<br />
Corallum presenting <strong>the</strong> general form <strong>of</strong> a Cyclolites. A single septal fossula. Septa<br />
exsert, and regularly radiate.<br />
Typ. s^.,Combophyllum osismorum, nob.<br />
Second Tribe—CYATHOPHYLLIN^.<br />
Septal apparatus regularly radiate, and uninterrupted, or ecjually divi<strong>de</strong>d into four<br />
groups by four superficial septal fossida?. No true columella, but sometimes a spurious<br />
one formed by <strong>the</strong> inner edge <strong>of</strong> <strong>the</strong> septa.