CORALS FROM THE SILURIAN FORMATION. 259 



Corattum massive, convex or subgibbose. Calices unequal in size ; the large ones 

 usually dispersed amongst the smaller ones, almost circular, and about 1 line in diameter , 

 the smallest about a quarter of a line in diameter ; others presenting all the 

 intermediate degrees between these two sizes. In some specimens the difference between 

 the calices is much less marked. A vertical section shows that the walls are thin, and the 

 tabulae horizontal, and, in general, closely set, but very unequally so. 



Found in the lower Silurian deposits at Under Daniell's Wood, Tortworth ; in the 

 Wenlock limestone at Wren's Nest, Dudley, Benthall Edge, Falfield near Tortworth, 

 Much Wenlock ; and, according to Mr. Lonsdale, in the lower Ludlow rocks at Sitch 

 Wood, Ledbury, Wentwoon Common, Wenlock; and in the middle Ludlow rocks, at 

 Aymestry, Tatton Edge, Downton on the Rock. Professor M'Coy mentions its existence 

 at Ardaun, Cong, and Kilbridge, in Galway ; and at Egool and Bellaghaderreen, in the 

 county of Mayo. It is also met with in Sweden. 



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

 Geology, of Mr. J. S. Bowerbank, of the Bristol Museum, &c. 



Some very small specimens, found at Dudley, and belonging to the Collections of 

 Mr. Fletcher and of Mr. Bowerbank, present the general characters of this species, but 

 have' much larger calices ; they appear to be young colonies of the above-described species, 

 and we easily understand how the mode of multiplication of Favosites must tend to 

 diminish the dimensions of the large corallites, as the number of individuals so produced 

 augments. 



In no other species of this genus is the difference in the size of the calices so great as in 

 F. Forbesi. 



5. Favosites Hisingeri. Tab. LXI, figs. 1, la, lb. 



Tubularia fossilis, &c, Magnus Bromel, Acta Liter. Suec, vol. ii, p. 408, 1728. 

 Madrepora poris, &c, Foufft, Amsen. Acad., vol. i, p. 101, tab. iv, fig. 21, 1749. 

 Fungites, Th. Pennant, Philos. Trans., vol. xlix, 2d part, p. 513, tab. xv, fig. 4, 1753. 

 Favosites alcyon? Def ranee, Diet. Sc. Nat., vol. xvi, p. 298, 1820. 



— Gothlandica? He Blainville, Diet. Sc. Nat. (Atlas Zooph.), pi. xl, fig. 4, 1830. 



— Man. d'Actin., pi. lxii, fig. 4. 

 — - alcyon? De Blainville, Diet., pi. xlii, fig. 5. — Man,., pi. lxiy, fig. 5. 

 Favosites? Pander, Beitr. zur Geogn. des Russ. Reiches, pi. xxix, fig. 9, 1830. 

 Calamopora minutissima? Castelnau, Terr. Sil. de 1'A.mer. du Nord, pi. xviii, fig. 2, 1843. 

 Favosites Hisingeri, Milne Edwards and Jules Haime, Pol. Foss. des Terr. Palseoz. (Arch. 



3 du Mus., vol. v), p. 240, pi. xvii, figs. 2, 2a, 2b, 1851. 

 Astrocerium venustum, /. Hall, Paleont. of New York, vol. ii, p. 120, pi. xxxiv, fig. 1, 



1852. 



Corattum massive, subgibbose. Calices almost equal in size, separated by walls that 

 are rather thick, in general pretty regularly hexagonal, and about half a line in diameter. 



