CORALS FROM THE MOUNTAIN LIMESTONE. 203 



17. LlTHOSTROTlON FlEMINGI. 



Stylaxis Flemingii, M'Coy, Ann. and Mag. of Nat. Hist., 2d series, vol. iii, p. 121, 1849. 



— — Milne Edwards and Jules Haime, Pol. Foss. des Terr. Palseoz., p. 494, 



1851. 



— — M'Coy, Brit. Palseoz. Foss., p. 160, pi. iii A, fig. 3, 1851. 



" Corallum of very long, prismatic, generally hexagonal, easily separable tubes, averaging 

 3 lines in diameter ; outer surface strongly striated longitudinally, and marked with direct 

 transverse rugosities of growth; bipartite division of the columns frequent; 1 vertical section, 

 exhibiting the thin flat axis, surrounded by an inner zone of small, slightly curved, inter- 

 stitial plates, inclining downwards and outwards from the axis, forming on each side a 

 row of nearly simple oblique cells ; outer zone of small, vesicular, much-curved plates, 

 inclined in an opposite direction, or upwards and outwards, four or five in a row ; hori- 

 zontal section, axis thin, half a line wide, surrounded by about 43 thin, radiating lamellse, 

 from the walls, half of which only reach half way ; numerous small, thin, transverse, con- 

 necting plates between the lamellae in the outer zone. 



" Common in the carboniferous limestone of Derbyshire." (M'Coy, op. cit.) 



6. Genus Phillipsastrea, (p. lxx.) 

 1. Phillipsastrea radiata. Tab. XXXVII, figs. 2, 2a. 



Erismatolithus tubiporites (radiatus), W. Martin, Petrif. Derb., pi. xviii, 1809. 



Tubipora radiata, S. Woodward, Syn. Table of Brit. Org. Rem., p. 5, 1830. 



Astrea Hennahit (pars), Phillips, Palseoz. Foss., pi. vii, fig. 15 d, (Cset. excl.), 1841. 



(Not Lonsdale). 

 Sarcinula placenta and Phillipsii, M'Coy, Ann. and Mag. of Nat. Hist., 2d series, 



vol. iii, p. 124, 125, 1849. 

 Phillipsastrea Hennahii (pars), UOrbigny, Prod, de Paleont., vol. i, p. 107, 1850. 

 Phillipsastrea radiata, Milne Edwards and Jules Haime, Pol. Foss. des Terr. Palseoz., 



p. 448, 1851. 

 Sarcinula Phillipsii and placenta, M'Coy, Brit. Palseoz. Foss., p. 110, pi. iii b, fig. 9, 



1851. 



Corallum massive, astreiform, with a flat surface. Calices irregularly placed; their 

 edges very slightly prominent, and their central fossula rather deep. Columella slender, 

 compressed, and in general not very distinct. Septo-costal radii almost completely con- 

 fluent exteriorly ; 24 or 30 in number, very thin, and becoming alternately unequal in 

 size near the walls, where some of them terminate. Diameter of the Calices about 



1 We have here above explained how this appearance may be produced by submarginal gemmation. 

 (Seep. 192.) 



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