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 cychim represented at least by costal 

 striae. If that were the case, S. PJoti would differ very little from 8. tuhidifcra} which 

 is found in the Coral Rag ; its septa being only thinner, and its columella a little smaller. 

 The same peculiarities distinguish it from S. lohaid" and S. octonis'^ in which the calices 

 equally present ten apparent systems. S. magnified^ 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. 



Getms Cyathophora.^ 



1. Cyathophoua LuciENsis. Tab. XXX, figs. 5, 5a. 



Cryptoccenia LuciENSis, IfOrh'ujmj, Prod., vol. i, p. 322, 1850. 



Stylina? Luciensis, Milne Edwards imi}i J. Ilaime, Polyp. Palseoz., etc., p. GO, 1851. 



CoraUim 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. Sejifa straight, very unequal in size, thick 

 externally, and continuing to extend outwards under the form of costae ; 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 tabula?, as is often the case in the CyatltophylUda. 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 Bouryueti, and that presented well developed septa 

 extending almost to the centre of the calices, and united by contiguous dissepiments some- 

 what resembling tabulae. We could, therefore, entertain no doubt as to the existence of 

 great affinity between these fossils and Stylina; 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 CyatJiophora by similar circumstances, we 



1 Tab. xiv, fig. 3. 



2 Explanaria lohata, Goldfuss, Petref. Germ., t. i, pi. xxxviii, fig. 9. 

 ^ Pseudoccenia ncfonis, D'Orbignj', Prodr. de Paleoiit., vol. ii, p. 34. 

 * Becacoenia magnifica, D'Orhigny, Prodr. de Paleont., vol. ii, p. 33. 

 ^ Michelin, Iconogr., p. 104. 



