CORALS FROM THE GREAT OOLITE. 113 



Ge?ius Cladophyllia.i 

 Cladophtllia Babeana. Tab. XXII, figs, 2, 2«, 2^. 



Madrepora flexuosa. Smith, Strata Identified by Org. Foss., p. 30, Upper Oolite, fig. 5, 



1816 (not M. flexuosa, Linnaeus). 

 EuNOMiA Babeana and Calamopiiyllia prima, D'Orbigny, Prod, de Palseont., t. i, 



p. 292, 1850. 

 Cladopiiyllia Babeana, Milne Edwards and /. Haime, Polyp. Palseoz., etc., p. 81, 1851. 



Corallum fasciculate. Corallites placed at unequal distances, cylindrical, with well 

 marked accretion swellings, and a thick epitheca, the wrinkles of which are quite horizontal. 

 Calices circular, or somewhat oval when large. Septa thin, straight, of unequal size, and 

 forming three complete cycla. The tertiary ones are sometimes almost rudimentary, and 

 in some corallites two of the primary ones, placed opposite each other, are more developed 

 than the others, so as to divide the visceral chamber into tw^o equal parts, a circumstance 

 which appears to indicate a commencement of fissiparous multiplication. Diameter of the 

 corallites one and a half or two lines. 



This fossil is found in the Great Oolite at Bradford Hill, near Bath, and the specimens 

 here described belong to the collections of Mr. Walton and Mr. Pratt. It is mentioned by 

 Smith as having been met with at Castle Combe. M. Terquem has also found it in the 

 Inferior Oolite of St. Quentin, near Metz, in Lorraine, and M. D'Orbigny, at Langres, 

 Departement de la Haute Marne. 



Cladophyllin Baheana is very much like C. Conyhearii, here above described, from the 

 Coral Rag. It appears, however, to differ from it by the regular horizontal direction of the 

 wrinkles of the epitheca, and the feeble development of its tertiary septa. The fossil 

 mentioned by M. D'Orbigny under the name of CalamophyUia prima is only a variety of 

 this species with the corallites smaller than in the preceding specimens, and not larger, as 

 is stated in the short description given by that palaeontologist. 



Genus Isastrea.^ 



1. Isastrea Conybearii. Tab. XXII, fig. 4. 



Corallum composite, massive, terminated by an almost flat surface. Calices nearly 

 equal, subtetragonal, and circumscribed by a simple edge common to the two adjoining 

 corallites, or separated only by a slight furrow. No Columella. 8ep)ia thick, in general 

 straight and much modified by the process of fossilisation ; the well developed ones not 

 numerous, and alternating with rudimentary ones. Systems unequally developed ; three 

 complete cycla, and a fourth cyclum in four of the systems ; the principal septa join in the 

 centre of the visceral chamber. Long diagonal of the calices six or seven lines. 



1 See p. 91. - Seep. 73. 



15 



