CORALS FROM THE SILURIAN FORMATION. 279 
Tabule horizontal, strong, and occupying only the central part of the visceral chambers, 
where the septo-mural tissue does not extend. Breadth of the calices about half a line. 
Dudley, Benthall Edge ; Lincoln Hill, Coalbrook Dale, Aston Ingham near May Hill, 
Lindells, and Woolhope ( Murchison) ; Gothland and Groningue. 
Specimens in the Collections of the Bristol Museum, of the Geological Society, of the 
Museum of Practical Geology, of Mr. Fletcher, &c. 
2. Tuecra Grayana. Tab. LXV, fig. 8. 
Tuecra Grayana, Milne Edwards and Jules Haime, Pol. Foss. des Terr. Paleeoz. (Arch. du 
Mus., vol. v), p. 307, 1851. 
Corallum massive, thin, adherent ; basal surface covered with a very thick, circularly 
wrinkled epitheca. Calices subequal, not prominent, and presenting a rather deep, circular 
central fossula. 12 septa, equally developed, closely set, very thick, subconfluent exteriorly, 
and bearing on their upper edge a double row of granulations. Diameter of the calices 
about half a line. 
Dudley. Collection of Mr. J. Gray. 
This species differs from the preceding one by the lesser number of the septa. 
Family CYATHAXONID A, (p. Ixv.) 
Genus CYATHAXONIA, (p. xv.) 
CYATHAXONIA? SILURIENSIS. 
CYATHAXONIA SILURIENSIS, M‘Coy, Ann. and Mag. of Nat. Hist., 2d ser., vol. vi, p. 281, 
1850. 
— _ M‘Coy, Brit. Paleeoz. Foss., p. 36, pl. ic, fig. 11, 1851. 
« Corallum elongate-conic, about 5 lines long and 2 lines in diameter at the height from 
the base ; strong central axis, nearly one third of the diameter ; 60 or 70 strong radiating 
lamella, each extending from the axis to the outer wall, before reaching which it bifurcates, 
leaving a triangular interlamellar space, about equal in width to the distance between the 
adjoining lamelle ; surface coarsely ridged longitudinally, the sulci corresponding to the 
divided edges of the lamelle, leaving one of the equal imtervening ridges to correspond 
with each of the spaces between the individual lamellae and between their divided edges. 
“Rare in the upper Ludlow rock of Underbarrow, Kendal, Westmoreland.” M‘Coy, 
loc. cit. 
