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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.

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