218 BRITISH FOSSIL CORALS. 



Silurian deposits at Storderley Edge (Upper Ludlow Rocks), Larden, and, according to 

 Mr. Lonsdale, at Churn-bank, on Palmer's Kairn near Ludlow ; in Ireland, according to 

 Mr. M'Coy, in numerous localities of the counties of Galway, Kerry, Wexford, Kildare, 

 Mayo, Tyrone, Waterford, and Wicklow ; in Russia at Waschkina (according to 

 Keyserling) ; in America at Casskill, and at Lexington, Kentucky (Goldfuss). Found in 

 the inferior Silurian deposits at Landovery. 



We are inclined to think that it is by mistake that Professor M'Coy mentions this 

 species as having been met with in the carboniferous formation in Ireland, and presume 

 that the fossil so alluded to by that geologist was the Alveolites septosa. 



The above-described species is easily distinguished from all the other species of 

 Favosites by the smallness of its calices. It resembles F. alveolarii and F. asperc^ by 

 the angular position of its mural pores ; but these two species differ from it by the calices 

 being much more irregular in size, as well as much larger. 



We have not remarked any material difference between the specimens found in the 

 Devonian and the Silurian formations ; but all these corals are so ill-preserved, that we 

 are not inclined to attach much importance to that supposed specific identity. 



2. Genus Emmonsia.^ 



Emmonsia hemispherica. Tab. XLVIII, figs. 4, 4«, 



Favosites alveolaris, Hall, Geol. of New York, p. 157, No. 31, figs. 1, la, 1843. (No. 8 



of Blainville.) 

 Favosites hemispherica, Tandell and Shumard, Contrib. to Geol. of Kentucky, p. 7, 1847. 

 Alveolites hemispherica, D'Orbigny, Prod, de Pal^ont., vol. i, p. 49, 18.50. 

 Favosites hemispherica, Jules Haime and Verneuil, Bull. Soc. Geol. de France, 2d ser., 



vol. vii, p. 162, 1850. 

 Emmonsia hemispherica, Milne Edwards and Jules Haime, Pol. Foss. des Terr. Palseoz., 



p. 247, 1851; 



Corallum composite, forming a subspherical mass, which becomes sometimes very tall, 

 and composed of superposed layers. Calices irregular, polygonal, and varying in size. 

 Septa (12) well developed, straight or slightly curved, and extending to the centre of the 

 upper tabulae. Mural pores large, placed at about a quarter of a line apart, and arranged 

 in pairs on some of the sides of the wall, but forming single lines on others. TabulcB very 

 closely set, somewhat irregularly horizontal. In the visceral chambers, where they are 

 broken down, they leave fragments adhering to the walls ; and in general, above the space 

 included between two of these fragments, a third fragment exists, so as to constitute an 



1 Calamopora alveolaris (pars), Goldfuss, Petref. Germ., t. i, pi. xxvi, figs, la, \c, 1826. 



2 Calamopora alveolaris (pars), Goldfuss, ibid., tab. xxvi, fig. 16. 



^ Milne Edwards and Jules Haime, Monographic des Polyp. Foss. des Terr. Palseoz. ; Archives du 

 Museum, vol. v, p. 246, 1851. 



