294 BRITISH FOSSIL CORALS. 
epitheca, and presenting very irregular accretion wrinkles. Upper surface slightly convex, 
and presenting large polygonal prominent reticulations formed by the line of junction of 
the corallites. Circular calicular protuberance small, but pretty distinct. Pseudo-columella 
somewhat elevated. Septo-costal radii extremely slender and numerous (about 100), but 
very unequally developed ; about 50 of them reach almost to the centre, and about half of 
these appear to bear a rudimentary paliform lobule. Diagonal about 1 inch; diameter of the 
calicinal ring about 3 lines. A vertical section shows that the tissue is almost entirely 
vesicular, and it is only in the parts corresponding to the axis of the visceral chamber that 
some appearance of vertical striae corresponding to the septa are visible. ‘The transversal 
undulating lines that are strongly marked in this section are produced by the intermittent 
mode of growth of the corallum, and correspond to the different surfaces, which become 
rather dense after each period of activity. They are almost horizontal in the parts corres- 
ponding to the visceral chambers, and suddenly rise up in the parts corresponding to the 
line of demarcation between the adjoining corallites. 
Dudley, Wenlock ; Egool and Bellaghaderreen, Mayo (M‘Coy). 
Specimens in the Collections of the Geological Society, of the Bristol Museum, of Mr. 
Bowerbank, and of the Parisian Museum. 
This species is very closely allied to S. ¢ypus,' but differs from it by its internal structure 
being more completely vesicular, and by its septa being more closely set. 
3. SrromBopes Puruirsrt. Tab. LXX, figs. 2, 2a. 
AcrrvuLarta Battica, Phillips, Paleeoz. Foss. of Cornw., Devon, &c., p. 13, pl. vii, fig. 18 5, 
1841. 
Actinocyatuus Purturpsit, D' Orbigny, Prodr. de Paleont., vol. i, p. 108, 1850. 
Srrompopes Puriiiesi, Milne Edwards and Jules Haime, Pol. Foss. des Terr. Paleeoz. 
(Arch. du Mus., vol. v), p. 429, 1851. 
Corallum much resembling the preceding ones, but differing from them by the existence 
of well-characterised paliform lobes. The circular elevation corresponding to the limits of 
the true calice, is also much larger in proportion to the breadth of the corallite, and the 
septa are less numerous. 
Wenlock. Collection of Professor Phillips. 
4. Srrompopes pirrivens. ‘Tab. LXXI, figs. 2, 2a. 
Acrrvutaria Baurica (pars), Lonsdale, in Murchison, Silur. Syst., pl. xvi, figs. 8, 8a, 1839. 
SrRomBopES DIFFLUENS, Milne Edwards and Jules Haime, Pol. Foss. des Terr. Palzeoz. 
(Arch. du Mus., vol. v), p. 431, 1851. 
1 See tab. Ixxi, fig. 1. 
