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 />
xliii<br />
which thus form simple partitions between <strong>the</strong> visceral cavities, and are thick and com|)act.<br />
Calices polygonal ; fossula ra<strong>the</strong>r <strong>de</strong>ep. Columella spongy. Sepki slightly exsert, <strong>the</strong>ir<br />
apex arched and <strong>de</strong>nticulated. Well-characterised, <strong>de</strong>nticulated pall, corresponding to all<br />
<strong>the</strong> septa, except those <strong>of</strong> <strong>the</strong> last cyclum.<br />
Typ. sp., Goniastrea solida, Milne Edw. and J. Haime, Ann., 3"' serie, t. x, pi. ix, fig. 7 ; Madrepora<br />
solida, var. h, Forskal, Descr. Anim. in Itin. Orient., p. 131.<br />
72. Genus Aphrastrea.<br />
Milne Edw. and J. Hairae, Comptes rend., t. xxvii, p. 495, 1848.<br />
Corallum increasing by fissiparity, and forming a convex mass <strong>of</strong> a light cellular<br />
structure, presenting on its un<strong>de</strong>r surface a complete, common epi<strong>the</strong>ca. Calices intimately<br />
imited by <strong>the</strong>ir margins, which thus assume <strong>the</strong> appearance <strong>of</strong> simple partitions. Columella<br />
spongy. Pali or paliform lobes <strong>of</strong> <strong>the</strong> septa corresponding to all <strong>the</strong> cycla, except <strong>the</strong> last.<br />
Septa <strong>de</strong>nticulated, shghtly exsert. Bissepimcnts vesicular, and highly <strong>de</strong>veloped. Walls<br />
extremely thick, and completely vesicular.<br />
Typ. sp., Aphrastrea <strong>de</strong>formis, Milne Edw. and J. Haime, Ann. <strong>de</strong>s So. Nat., 3"" serie, vol. x, tab. ix,<br />
fig. 11 ; Astrea <strong>de</strong>formis, Lamarck, Hist, <strong>de</strong>s An. sans Vert., t. xi, p. 2G4.<br />
73. Gemis Parastrea.<br />
Mdne Edw. and J. Hairae, Comptes rend., t. xxvii, p. 495, 1848.<br />
Corallum increasing by fissiparity, and having <strong>the</strong> same general form as in <strong>the</strong> preceding<br />
genus, but differing from it by <strong>the</strong> mo<strong>de</strong> <strong>of</strong> union <strong>of</strong> <strong>the</strong> corallites, which takes place by<br />
means <strong>of</strong> <strong>the</strong> costae and <strong>the</strong>ir dissepiments, so that <strong>the</strong> calices, instead <strong>of</strong> being separated<br />
only by a common simple margin, have each a distinct margin in<strong>de</strong>pen<strong>de</strong>nt <strong>of</strong> those<br />
surromicUng it. Septa exsert, and armed wdth teeth, <strong>the</strong> largest <strong>of</strong> which are placed near<br />
<strong>the</strong> centre <strong>of</strong> <strong>the</strong> calice, and <strong>of</strong>ten assume <strong>the</strong> appearance <strong>of</strong> pali. Dissepiments well<br />
<strong>de</strong>veloped.<br />
Typ. sp., Parastrea amivonim, Milne Edw. and J. Hairae, Ann., 3"" serie, vol. x, pi. ix, fig. 9.<br />
Section v.—ASTREIN^ REPTANTES.<br />
Corallum increasing by <strong>the</strong> <strong>de</strong>velopment <strong>of</strong> buds on stolons, or on membraniform<br />
basal expansions. The corallites not united by <strong>the</strong>ir si<strong>de</strong>s, excepting acci<strong>de</strong>ntally by<br />
means <strong>of</strong> <strong>the</strong>ir walls, and remaining short. Septa feebly <strong>de</strong>nticulated. Dissepiments<br />
almost rudimentary.<br />
74. Genus Angia.<br />
Milne Edw. and J. Haime, Comptes rend., t. xxvii, p. 496, 1848.<br />
Corallum composed <strong>of</strong> short, cylindrical corallites, united by a common gemmiferous<br />
basal expansion, and completely free laterally. Calices sub-circular ; fossula broad and