CORALS FROM THE SILURIAN FORMATION. 261 



Upper Silurian beds of Wenlock, Ludlow, Dudley, Ireland, Sweden, and Russia. 



Specimens in the Collections of the Museum of Practical Geology, of the Geological 

 Society, of Mr. Bowerbank, of the Museum of Paris, &c. 



This coral bears great resemblance to Favosites cervicornis} and we are even doubtful 

 as to its being specifically different from it ; its calices are, however, less unequal in size, 

 and almost circular. 



In a Dudley specimen, which we consider as belonging to the above-described species, 

 the large calices were not more than two fifths of a line in diameter. 



According to Mr. Lonsdale, the same species appears to exist in the Devonian forma- 

 tion of the Oural Mountains. 



7. Favosites fibrosa. (See p. 217, and Tab. XLVIII, fig. 3.) Tab. LXI, figs. 5, ba. 



Stenopora fibrosa, M'Coy, Brit. Palseoz. Foss., p. 24, 1851. 



Astrocerium constrictum, J. Hall, Paleont. of N. Y., vol. ii, p. 123, pi. xxxiv a, figs. 2 



and 3, 1852. 



Lower Silurian, Horderley, and Llandovery. 



According to Professor M'Coy (op. cit), this species has been found in the Coniston 

 limestone schists of Llansantfraid, the Caradoc sandstone schists of Bala, the Upper Ludlow 

 rocks, the Wenlock limestone, the limestone of Llandeilo, &c, of a great quantity of British 

 localities. 



Professor Hall indicates it in the shale of the Niagara group at Lockport. 



8. Favosites crassa. 



Favosites crassa, M'Coy, Ann. and Mag. of Nat. Hist., 2d series, vol. vi, p. 284, 1850. 

 — — M'Coy, Brit. Palaeoz. Foss., p. 20, pi. i c, fig. 9, 1851. 



" Corallum forming large, subcylindrical, curved branches, composed of long, slightly- 

 diverging, remarkably regular and equal prismatic tubes, opening as thin-walled polygonal 

 cells on the surface, with a nearly uniform diameter of half a line ; two rows of pores on 

 each face of the prismatic tubes, diaphragms either slightly more or less than the diameter 

 of the tubes apart ; interpolated young tubes few. 



"In the Coniston limestone, Coniston Water-head, Lancashire." 



Favosites? oculata, M'Coy, Brit. Palaeoz. Foss., p. 21 — Ceriopora oculata, Goldfuss, 

 Petref. Germ., vol. i, tab. lxiv, fig. 14, — appears to appertain to the class of Bryozoa. 



1 See tab. xlviii, fig. 2. 



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