76 BRITISH FOSSIL CORALS. 



Family— ASTREID^, (p. xxiii.) 

 Genus Stylina, (p. xxix.) 



1. Stylina tubulifera. Tab. XIV, figs. 3, 3r/, 2>b, 3c. 



CoKALLOiD BODY? J. Moi'ton, Nat. Hist, of Northamptonshire, p. 184, tab. ii, fig. 10, 1712. 

 AsTREA TUBULiFEHA, Phillips, Illustr. of the Geol. of Yorkshire, vol. i, p. 126, tab. iii, 

 fig. 6, 1829 ; and second edition, p. 98. (The specimen figured 

 was much worn away.) 

 Hydnophoea Fuieslebenii? Fischer, Oryctographie de Moscou, pi. xxxiii, fig. 2, 1837. 

 Stylina tubulosa, Michelin, Icon. Zooph., p. 97, pi. xxi, fig. 6, 1843. 

 AsTREA TUBULOSA and Agaeicia lobata, Morris, Cat. of Brit. Foss., pp. 20, 31, 1843. 

 Dentipora glomerata, M'Coij, Ann. of Nat. Hist., s. 2, vol. ii, p. 399, 1848. 

 Stylina tubulosa, Milne Edwards and /. Ilaime, Monogr. des Astreides, Ann. des Sc. 

 Nat., s. 3, vol. X, p. 289, 1848. (Wrongly referred to the Jstrea 

 tubulusa of Goldfuss, whose figure is inexact.) 

 Decac(ENIA Michelini, UOrbigny, Prodr. de Paleontol., v. i, p. 33, 1850. 

 Stylina tubulifera, Milne Edwards and J. liaime, Polyp, des Terrains Palseoz., etc., 

 p. 59, 1851. 



CoraUum massive, more or less elevated, convex on the upper suiface, 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 less worn away, but was probably continuous in 

 the natural state. In the parts thus denuded, the costal strise 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, wxll- 

 marked, and equally developed costcs. 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. 2>a). The calices are perfectly 

 cu'cular 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 se^jta form three complete cycla, and in four of 

 the six systems there are sejjia belonging to a fourth cyclum. In these highly-developed 

 systems the secondary septa arc 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 sejjta of 

 the last-formed cyclum (that is to say, the tertiary septa in the small ones and those of 

 the fom'tli cyclum in the large ones) are quite rudimentary on the inside of the wall, but 

 correspond to well-developed costa) outwardly. The principal scjjta arc strong, somewhat 



