CORALS FROM THE MOUNTAIN LIMESTONE. 155 



2. MlCHELINIA tenuisepta. Tab. XLIV, figs. 1, la, Id. 



Calamopoka tenuisepta, John Phillips, Illust. of Geol. of York., vol. ii, p. 201, pi. ii, 



fig. 30, 183G. 

 Michelinia tenuisepta, De KonincJc, An. Foss. des Terr. Carb. de Belg., p. 31, pi. c, 



fig. 3, 1842. 

 — — Michelin, Icon. Zooph., pp. 83 and 254, pi. xvi, fig. 3, 1843. 



Favosites (Michelinea) tenuisepta, M'Coy, Syn. Carb. Foss. of Ireland, p. 193, 1844. 

 Michelinea glomekata? M'Coy, Ann. and Mag. of Nat. Hist., 2d Series, vol. iii, p. 122, 



1849. 

 Favosites tenuisepta and Michelinia tenuisepta, D'Orbigny, Prod, de Palseont., vol. i, 



p. 160, 1850. 

 Michelinia tenuisepta, Milne Edwards and Jules Haime, Pol. Foss. des Terr. Palseoz., 



p. 250, 1851. 

 Michelinea glomerata? M'Coy, Brit. Palseoz. Foss., p. 80, pi. iii B, fig. 14, 1851. 



Corallum tall ; common basal plate with a strong epitheca, striate transversely, but not 

 bearing any radiciform processes. Calices polygonal, unequal in size, and containing 

 thirty or forty equally developed septal stria). Tubula very delicate, closely set, much 

 blended together, and minutely granulated. 



Height of the corallum 4 inches ; diagonal of the calices 3 or 4 lines. 



M. tenuisepta is found in the environs of Bristol, at Masbury, near Mendip, and at 

 Bolland ; Professor M'Coy has also met with it in Ireland ; and it exists also on the Conti- 

 nent, at Sable and Juigne, in France, and at Tournay, in Belgium. Specimens are in the 

 collections of the Museums of Bristol, of Cambridge, of Paris, &c. 



This species much resembles M. favosa, by the structure of the visceral chambers, 

 but differs from it by the corallites being more elongate, and by the common basal 

 plate not bearing any radiciform appendices. M. tenuisepta is also very closely allied 

 to M. convexa} and M. megastoma, 2 but its endothecal vesicles are less convex, and it 

 never attains the size to which this species usually come. The obliquity or irregular 

 arrangement of its tabulae distinguish it from M. antiqua? and M. concinna, i in which 

 the tabulae are almost horizontal and distinct. M. geometrical differs from the above- 

 described species by the great regularity of its polygonal calices. 



We refer to this species, but with some doubt, the fossil designated by Professor 

 M'Coy, under the name of Michelinea glomerata ; in the specimen figured by that 

 geologist, the common basal plate is worn away, so that it is not possible to ascertain 



1 D'Orbigny, Prod., vol. i, p. 107; Milne Edwards and J. Haime, Polyp. Palseoz., tab. xvi, fig. 1. 



2 See tab. xliv, fig. 3. 



3 Dictyophijllia antiqua, M'Coy, Syn. of Carb. Foss. of Ireland, tab. xxvi, fig. 10. 



* Lonsdale in Geol. of Russia, by Murch., Verneuil, and Keyserling, vol. i, p. 611, tab. a, fig. 3. 

 5 Milne Edwards and J. Haime, Polyp. Palseoz., tab. xvii, fig. 3. 



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