2f}0 BRITISH FOSSIL CORALS. 



12 septa, subequal, not. very thick, extending to the centre of the corallites, and formed 

 by well-developed, slightly curved processes. Tabulae slender, rather closely set, and 

 horizontal, or somewhat flexuous. 



Lower Silurian deposits at Cullimore's Quarry, Tortworth ; upper Silurian rocks of 

 Benthall Edge, Wenlock Edge ; Gothland ; and Niagara limestone, at Lockport, and 

 Rochester (J. Hall). 



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

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



In this species the septal processes are bent upwards, and more developed than in the 

 other Favosites. Mr. Hall has, for that reason, proposed placing it in a new generical 

 division, under the name of Astrocerium ; l but every intermediate degree between this 

 structure and the most rudimentary state of the septal system in some other Favosites are 

 met with, so that the line of separation would be arbitrary, and it is also to be remembered 

 that in many cases the delicate and brittle processes which constitute the septa, have 

 evidently disappeared during the fossilisation of the coral. In Favosites Goldfussi, 2 for 

 example, we have found distinct remains of the septal processes only in two specimens, 

 although we have searched attentively for them in several hundred specimens found in 

 various localities. 



We are inclined to think that the Dudley fossil, mentioned by Parkinson under the 

 name of Porpital madreporite, 5 and by Dr. Fleming under that of Sarcinula annularis* is 

 referable to the above-described species. 



6. Favosites cristata. Tab. LXI, figs. 3, 'da, and 4, 4«? 



Madreporites cristatus, Blumenbach, Comment. Soc. Scient. Gott., vol. xv, p. 154, tab. iii, 



fig. 12, 1803. 

 Calamopora polymorpha, Hisinger, Letli. Suec, p. 97, tab. xxvii, fig. 6, 1837. (Not 



of Goldfuss.) 

 — spongites? Ibid., p. 97, tab. xxvii, fig. 7 . (Not of Goldfuss.) 



Favosites polymorpha, Lonsdale, in Murchisou, Silur. Syst., p. 684, pi. xv, fig. 2, 1839. 

 Calamopora polymorpha, Eichwald, Silur. Schist. Syst. in Esthland, p. 198, 1840. 

 Favosites polymorpha, Lonsdale, M. V. K. Russ. and Ural, vol. i, p. 610, 1845. 

 Alveolites Lonsdalei, lVOrbigny, Prodr. de Paleont., vol. i, p. 49, 1850. 

 Favosites oristata, Milne Edwards and Jules Haime, Pol. Foss. des Perr. Palaeoz. (Arch. 

 duMus., vol. v), p. 242, 1851. 



Corattum dendroidal; its branches generally spreading, cylindrical, and submamillose. 

 Calices somewhat unequal in size, often almost circular, and with a rather thick margin. 

 The large ones about half a line in diameter. 



1 Paleontology of New York, vol. ii, p. 120, 1852. 



2 See tab. xlvii, fig. 3. 



" Org Remains, vol. ii, p. 69, tab. vii, figs. 3, 7 ■ 



* British Animals, p. 503, 1828.— Woodward, Syn. Tab. of Brit. Org. Rem., p. 5, 1S30. 



