CORALS FROM THE GREAT OOLITE. 107 
and we have not been able to ascertain satisfactorily whether the form of the calices is 
not due to erosion, and whether there be not another cyclum represented at least by costal 
strie, If that were the case, S. Plott would differ very little from S. tudulifera,' which 
is found in the Coral Rag ; its septa being only thinner, and its columella a little smaller. 
The same peculiarities distinguish it from 8. Jobata’ and S. octonis,’ in which the calices 
equally present ten apparent systems. iS. magnifica‘ is easily distinguished from it by the 
size of the calices and its more developed septa. 
S. Ploti, figured in this Monograph, was found in the Great Oolite at Comb-Down, 
and belongs to Mr. Walton’s collection. 
Genus CYATHOPHORA.” 
1. CyatHopHora Luctmnsis. Tab. XXX, figs. 5, 5a. 
Cryprocenia Lucrensis, D’ Orbigny, Prod., vol. i, p.322, 1850. 
any 
Styzina? Luciensts, Milne Edwards and J. Haime, Polyp. Palzoz., ete., p. 60, 1851. 
Corallum massive, convex. Calices circular, projecting very little above the common 
surface, not much crowded, and circumscribed by a very thin wall. Two cycla of septa 
well developed, and a third rudimentary. Septa straight, very unequal in size, thick 
externally, and continuing to extend outwards under the form of costee ; those of the first 
cyclum reaching almost to the centre of the calice. No appearance of a columella. 
Diameter of the calices somewhat more than one line. 
This fossil was found in the Bradford Clay at Pound hill, and belongs to Mr. Walton’s 
collection. 
The same species has been met with in France, at Luc, and at Ranville, near Caen. 
The genus Cyathophora of M. Michelin was established on a very imperfect specimen, 
in which that geologist thought that the visceral chambers were divided at short distances 
by a series of horizontal tabulz, as is often the case inthe Cyathophyllide. But having had 
an opportunity of examining this fossil in M. Michelin’s collection, we recognised its specific 
identity with a better preserved coral that we had before seen in M. Defrance’s collection, 
where it bore the name of Astrea Bourgueti, and that presented well developed septa 
extending almost to the centre of the calices, and united by contiguous dissepiments some- 
what resembling tabula. We could, therefore, entertain no doubt as to the existence of 
great affinity between these fossils and Sty/ina ; these even lose accidentally their columella 
in many specimens where the septa remain unimpaired, and as it appeared to us possible 
to account for the absence of that central axis in Cyathophora by similar circumstances, we 
1 Tab. xiv, fig. 3. 
2 Explanaria lobata, Goldfuss, Petref, Germ., t. i, pl. xxxvii, fig. 9. 
8 Pseudoceenia octonis, D'Orbigny, Prodr. de Paléont., vol. ii, p. 34. 
* Decaceenia magnifica, D’Orbigny, Prodr. de Paléont., vol. ii, p. 33: 
° Michelin, Iconogr., p. 104. 
