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A monograph of the British fossil corals - kreidefossilien.de

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Ixxviii<br />

BRITISH FOSSIL CORALS.<br />

12. Genus Xenia.<br />

Savigny, Egypte, Atlas and op., Lamarck, op. cit., vol. ii, p. 629, 1816.<br />

Polypi forming subramified masses, as in Alcyonium, but not retractile, and not having<br />

a thick coating <strong>of</strong> spiciilcE at <strong>the</strong> basis <strong>of</strong> <strong>the</strong> tentacula.<br />

Typ. sp. Xenia umbellata, Savigny, Egypte, Polyp., tab. i, fig. 3.<br />

13. Genus Nephthya.<br />

Savigny, Atlas <strong>de</strong> I'Egypte; Blainville, Manuel d'Actinol, p. 523; Spoggo<strong>de</strong>s, Lesson, lUustr. <strong>de</strong><br />

Zoologie, 1831.<br />

Polypi forming arborescent masses, incompletely retractile, and having <strong>the</strong> bor<strong>de</strong>rs <strong>of</strong><br />

<strong>the</strong> calice thick and incrustated with large navicular spiculse.<br />

Typ. sp„ Nephthya Chalroli, Audouin, ap. Savigny, Egypte, Pol. tab. ii. fig. 5.<br />

14. Genus Paralctonium.<br />

Alcyonidia, Milne Edwards, Ann. <strong>de</strong>s Sc. Nat. 2d series, vol. iv, p. 323.<br />

Polypi resembling Nephthya, but being completely retractile, and having <strong>the</strong> lower<br />

part <strong>of</strong> <strong>the</strong> common mass incrustated with a thick coating <strong>of</strong> long navicular spicula>, but<br />

<strong>the</strong> upper part membranaceous and retractile,<br />

Typ. sp., Paraleyonium elegans ; Alcyonidia elegans, Milne Edwards, loc. cit., tab. xii and xiii.<br />

15. Genus Sarcophyton.<br />

Lesson, Zoologie du Voyage <strong>de</strong> la Coquille, Zooph., p. 92, 1831.<br />

Differs from <strong>the</strong> genus Alcyonium by <strong>the</strong> great abundance and <strong>the</strong> peculiar structure<br />

<strong>of</strong> <strong>the</strong> common tissue, <strong>the</strong> cells <strong>of</strong> which are tubular, and arranged with great regularity<br />

in fasciculi, perpendicularly to <strong>the</strong> upper surface <strong>of</strong> <strong>the</strong> mass.<br />

Typ. sp., Sarcophyton plicatum, Valenciennes MSS. ; Sarcophyton lobulatum. Lesson, loc. cit. ; Alcyonium<br />

plicaium, Lamarck, Hist, <strong>de</strong>s An. sans Verteb., vol. ii, p. 395.<br />

16. Genus Cespitularia.<br />

Valenciennes MSS.<br />

Polypi non-retractile, arranged in fascicidi, and united in <strong>the</strong> greatest part <strong>of</strong> <strong>the</strong>ir<br />

length by a <strong>de</strong>nse, tough, common tissue, as in Alcyonium.<br />

Typ. sp., Cespitularia tmdtipinnata, Valen. ; Cornularia multipinnata, Quoy and Gaimard, Voyage <strong>de</strong><br />

I'Astrolabe, Zooph., tab. .x.xii, figs. 1-4.

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