190 BRITISH FOSSIL CORALS. 
5, Genus LitnostRotion.! 
1. LivHosTROTION BASALTIFORME. ‘Tab. XXXVIII, figs. 3, 3a, 30. 
LirnosTrorion, Luid, Lithophyllacii Britannici Ichnographia, epistola 5, tab. xxii, 1760. 
— Parkinson, Org. Rem., vol. ii, pl. ix, figs. 3 and 6, 1808. 
ASTREA BASALTIFORMIS, Conybeare and William Phillips, Outlines of Geol. of Engl. and 
Wales, p. 359, 1822. 
ASTREA ARACHNOIDES, Defrance, Dict. Se. Nat., vol. xlii, p. 383, 1826. 
LITHOSTROTION STRIATUM, Fleming, Brit. Anim., p. 508, 1828, 
CoLUMNARIA stRIATA, De Blainville, Dict. Sc. Nat., vol. lx, p. 316, 1830.—Man. d’Actin., 
p. 360, pl. lu, fig. 3. 
LirHostrorion striatum, S. Woodward, Syn. Table of Brit. Org. Rem., p. 5, 1830. 
CyaTHOPHYLLUM BASALTIFORME, Phillips, Geology of York, vol.ii, p. 202, pl. ui, figs. 21, 22, 
1836. 
CotumNnaria striata, Milne Edwards, Ann. de la 2de edit. de Lamarck, vol. ii, p. 343> 
1836. 
AsTREA HEXAGONA, Portlock, Rep. on the Geol. of Londonderry, &c., pp. 332, pl. xxiii, 
fig. i, 1843. 
ASTREA BASALTIFORMIS, [bid., p. 333. 
Lirnostrotion striatum, M‘Coy, Syn. Carb. Foss. of Irel., p. 188, 1844. 
— MICROPHYLLUM? Keyserling, Reise in Petschora, p. 156, tab. i, fig. 2, 1846, 
NemarHyLium minus, M‘Coy, Ann. and Mag. of Nat. Hist., 2d series, vol. iii, p. 17, 1849. 
LITHOSTROTION BASALTIFORME and Micropuyiitum, D’Orbigny, Prodr. de Pal., vol. i, 
p. 159, 1850. 
—_— — Milne Edwards and Jules Haime, Pol. Foss. des Terr. Pal., 
p. 441, 1851. 
NEMATOPHYLLUM MINUS, M‘Coy, Brit. Palzeoz. Foss., p. 99, pl. iii B, fig. 3, 1851. 
STYLASTREA BASALTIFORMIS, M‘Coy, ibid., p. 107. 
Corallum composite, astreiform. Corallites prismatic, and completely united by their 
walls. Calices very unequal in size. A horizontal section shows that the outer walls are 
very thin and distinct, and that the existence of the inner walls is indicated only by the 
limit of the vesicular dissepiments which occupy the exterior zone of the imterseptal loculi. 
Columella small and compressed, but slightly inflated in the middle. Septa rather closely 
set (40 or 50), very thin, delicately flexuous, and varying somewhat in size alternately; the 
largest only extend near to the columella. Great diagonal of the calices 6 or 5 lines; 
diameter of the zone occupied by the inner wall, 25 or 3 lines. 
The British specimens here described were found at Bristol, Norfolk, and Kendal. 
Professor Phillips mentions the existence of the same species at Ribble Head, Moughton 
Scar, Hesket, Newmarket, and Wrekin; and Colonel Portlock, at Desertmartin, Derry, and 
1 See ‘Pol. Foss. des Terr. Palzeoz.,’ p. 432. 
