CORALS FROM THE SILURIAN FORMATION. 285 



Specimens are in the Collections of the Bristol Museum, of the Museum of Practical 

 Geology, of the Geological Society of London, of Mr. Bowerbank, M. Bouchard-Chantereaux, 

 and M. de Verneuil. 



This coral is remarkable by its mode of gemmation, exclusively calicinal, and by the 

 everted form of its calices. 



It most resembles C. regiurd and C. helianthoides? but its septa are thicker and less 

 numerous than in those large corals. 



6. Cyathophyllum flexuosum. Tab. LXVIL figs. 2, 2a. 



Madrepora composita, &c, Fotifft, Amsen. Acad., vol. i, p. 96, tab. iv, figs. 5 and 13, 1749. 



— flexuosa, Linne, Syst. Nat., edit. 12, p. 1278, 1767. 



Caryophyllia flexuosa, Lonsdale, in Murchison, Sil. Syst., p. 689, pi. xvi, fig. 7, 1839. 



(Not Lamarck.) 

 Diphyphyllum flexuosum, VOrbigny, Prodr. de Paleont., vol. i, p. 38, 1850. 

 Cyathophyllum flexuosum, Milne Edwards and Jules Haime, Pol. Foss. des Terr. Palseoz. 



(Arch, du Mus., vol. v), p. 386, 1851. 



Corallum dendroid ; gemmation calicular. Corallites cylindrical, tall ; epitheca feeble ; 

 costal stria? not numerous (about 20). Diameter of the large individuals about 1| 

 line or 2 lines. 



Wenlock Shale, Malvern. Ferriter's Cove and Dingle, Kerry (M'Coy). Gothland. 



Specimens are in the Collection of the Geological Society of London. 



This species much resembles C. parricidal in which, however, the corallites are 

 turbinate and the septa less developed. 



7. Cyathophyllum trochiforme. 



Strephodes trochiformis, M'Coy, Ann. and Mag. of Nat. Hist., 2d ser., vol. vi, p. 275, 



1850. 

 — — M'Coy, Brit. Palseoz. Foss., p. 31, pi. i b, fig. 21, 1851. 



" Corallum simple, slightly curved, widely turbinate ; average length one inch three 

 lines, and width at mouth one inch one line, with irregular swellings of growth ; outer wall 

 very thin, marked with equal lamellar sulci (6 in 3 lines at one and a quarter inch in 

 diameter, or 83 all round) ; terminal cup very deep, conical, margin rounded, 

 sides gradually sloping, lined by the thin alternately 'longer and shorter uneven-edged 

 lamellae, the longest of which unite, and are irregularly blended at the centre, connected 

 throughout by numerous curved transverse vesicular plates : horizontal section shows the 

 same characters as the terminal cup, the alternate lamellae extending about half way to the 



1 See tab. xxxii, figs. l r 2, 3, 4. 2 See tab. xli, fig. 1. 3 See tab. xxxvii, fig. 1. 



38 



