CORALS FROM THE MOUNTAIN LIMESTONE. 175 



narrow, equally developed, and alternating with an equal number of smaller ones. Tabula 

 very large, and to a great extent smooth. Height of the corallum about 3 inches or more ; 

 diameter of the tabulae f of an inch. 



Professor M'Coy mentions having met with this species at Corwen. 1 All the specimens 

 that we have examined were from Tournay, in Belgium. 



A. cornu-bovis differs from a A. Uenslowi 2 by its elongate cylindrical form; from 

 A. spinosui by the absence of mural spines, from A. nodulosus* and A. annulosus 5 by the 

 form of the circular accretion swellings of the wall, which do not constitute acute ridges ; 

 and from A. Yandelli* which it resembles the most, by its septa being more numerous and 

 its general form less irregular. 



3. Amplexus nodulosus. 



Amplexus nodulosus, Phillips, Palaeoz. Foss., p. 8, 1841. 



— serpuloides, Be Koninck, Anim. Foss. des Terr. Carb. de Belg., p. 28, pi. b, 



figs. 7, 8, 1842. 



— nodulosus, M'Coy, Syn. Carb. Foss. of Ireland, p. 185, 1844. 



— serpuloides, Michelin, Icon., p. 257, pi. lix, fig. 7, 1846. 



— nodulosus, Milne Edwards and Jules Haime, Pol. Foss. des Terr. Palaeoz., 



p. 345, 1851. 



Corallum very long, sub-cylindrical, slightly flexuous, covered with a well characterised 

 epitheca, and presenting, at the distance of about one line and a half apart, a series of 

 circular prominent sharp ridges. Septa quite marginal; about thirty. Height of the 

 largest fragments about 3 inches ; diameter 3 lines. 



Professor Phillips discovered this fossil in England, but does not mention the locality 

 in which it was found. Professor M'Coy mentions its existence in Ireland. The specimens 

 which we have seen are from Vise, in Belgium. 



This species is remarkable for the prominent circular ridges of its wall ; the same 

 character is observable in A. annulatus? but in this latter Coral the mural ridges are not so 

 closely set and a constriction exists above each of them. 



1 Ann. and Mag. of Nat. Hist., 2d series, vol. iii, p. 133. 



2 See tab. xxxiv, fig. 5. 



* De Koninck, Ann. Foss. des Terr. Carb. de Belgique, tab. c, fig. 1. 



* Phillips, Palaeoz. Fossils, p. 8 ; Amplexus serpuloides, De Koninck, op. cit., tab. B, figs. 7, 8. 



5 De Verneuil and J. Haime, in Bull, de la Soc. Geol. de France, s. 2, vol. vii, p. 151 ; Milne Edwards 

 and Jules Haime, Pol. Foss. des Terr. Palaeoz., p. 345. 



6 Milne Edwards and Jules Haime, op. cit., tab. iii, fig. 2. 



7 De Verneuil and J. Haime, in Bullet, de la Soc. Geol. de France, s. 2, vol. vii, p. 151; Milne 

 Edwards and Jules Haime, Polyp, des Terr. Palaeoz., p. 345. 



