76 BRITISH FOSSIL CORALS. 
Family—ASTREID&, (p. xxii.) 
Genus StYLINA, (p. xxix.) 
1. Srytina tusutirera. Tab. XIV, figs. 3, 3a, 34, 3c. 
CoraLLorp Bopy? J. Morton, Nat. Hist. of Northamptonshire, p. 184, tab. ui, fig. 10, 1712. 
ASTREA TUBULIFERA, Phillips, Ulustr. of the Geol. of Yorkshire, vol. i, p. 126, tab. iu, 
fig. 6, 1829; and second edition, p. 98. (The specimen figured 
was much worn away.) 
Hypnopnora FrigsLeBentt? Fischer, Oryctographie de Moscou, pl. xxxiii, fig. 2, 1837. 
Srytiva TUBULOSA, Michelin, Icon. Zooph., p. 97, pl. xxi, fig. 6, 1843. 
AsTREA TUBULOSA and AGArRtcta LoBATA, Morris, Cat. of Brit. Foss., pp. 20, 31, 1843. 
DentTiIrpora GLomERATA, M‘Coy, Aun. of Nat. Hist., s. 2, vol. ii, p. 399, 1848. 
Srytina TuBuULOsA, Milne Edwards and J. Haime, Monogr. des Astreides, Ann. des Se. 
Nat., s. 3, vol. x, p. 289, 1848. (Wrongly referred to the dstrea 
tubulosa of Goldfuss, whose figure is inexact.) 
Decaca@nia MicueE tnt, D’ Orbigny, Prodr. de Paléontol., v. 1, p. 33, 1850. 
SryLina TUBULIFERA, Milne Edwards and J. Haime, Polyp. des Terrains Palzoz., etc., 
p. 59, 1851. 
Corallum massive, more or less elevated, convex on the upper surface, and somewhat 
gibbose. Common basal plate or wall with a very thin epitheca, which is most distinct on 
the accretion ridges, and is always more or Jess worn away, but was probably continuous in 
the natural state. In the parts thus denuded, the costa/ strize became visible; they are very 
delicate, closely set, quite straight, and equally developed. The corallites are almost cylin- 
drical, and diverge in fasciculi from the common basis (fig. 3). The upper surface of the 
corallum is occupied by the calices, which are placed at some distance from each other, and 
very unequally exsert ; the terminal portion of the corallites which thus protrudes has the 
form of a short truncate cone, and is surrounded by straight, delicate, closely-set, well- 
marked, and equally developed coste. These are composed of a single row of granulations, 
and meet at the bottom of the intercalicular depressions, where those of two adjoining 
corallites often become completely blended together (fig. 3a). The ca/ices are perfectly 
circular and somewhat unequal in size; the fossula is circular, rather narrow, and not 
deep ; the columella is styliform, small, and slightly prominent ; it is somewhat compressed, 
and its transverse section is suboval. The sepa form three complete cycla, and in four of 
the six systems there are sep/a belonging to a fourth cyclum. In these highly-developed 
systems the secondary sepfa are almost as large as the primary ones, and thus give to the 
calice the appearance of having ten equal systems (fig. 3a). In each system the septa of 
the last-formed cyclum (that is to say, the tertiary septa in the small ones and those of 
the fourth cyclum in the large ones) are quite rudimentary on the inside of the wall, but 
correspond to well-developed costa outwardly. The principal sepfa are strong, somewhat 
