CORALS FROM THE GREAT OOLITE. 113 
Genus CLADOPHYLLIA.!} 
CuapopHyYLuiA Baszana. Tab. XXII, figs. 2, 2a, 20. 
MapDREPORA FLEXUOSA, Smith, Strata Identified by Org. Foss., p. 30, Upper Oolite, fig. 5, 
1816 (not M. flexuosa, Linnzeus). 
Evunomia Bapeana and CaLAaMopHyLira PRIMA, D’Orbigny, Prod. de Paleont., t. 1, 
p- 292, 1850. 
CrapopnyLiia Basrana, Milne Edwards and J. Haime, Polyp. Paleeoz., 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. Sepa 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 two 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. 
Cladophyllia Babeana is very much like C. Conybearii, 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 Calamophylha 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 paleontologist. 
Genus ISASTREA.” 
1. Isasrrea ConyBrartt. Tab. XXII, fig. 4. 
Corallum composite, massive, terminated by an almost flat surface. Calices nearly 
equal, subtetragonal, and cireumscribed by a simple edge common to the two adjoining 
corallites, or separated only by a slight furrow. No Colwmella. Septa 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. 2 See p. 73. 
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