230 BRITISH FOSSIL CORALS. 



Corallum composite, fasciculated, or astreiform ; tall ; gemmations principally calicular. 

 CoralUtes almost cylindrical, and presenting but slight growth swellings. Calices in 

 general circular, sometimes agglomerated and polygonal; rather deep. Forty or fifty 

 septa, somewhat unequal in size alternately, thin, narrow at the top, straight, and bearing 

 a small paliform lobe near the centre of the calice. Diameter of the cahces about 4 lines. 

 Tabula well developed ; interseptal vesicles small. In horizontal sections of this corallum 

 the spot where the dissepiments cease has the appearance of an inner wall, placed at a 

 small distance from the exterior one. 



Found at Teignmouth Beach near Torquay, at Newton, and at Plymouth. 



Specimens are in the collections of Mr. Bowerbank and of Dr. Battersby. 



In a variety of this species found at Torquay, the cahces are not more than 2 or 2^ 

 lines in diameter. 



M. D'Orbigny has placed this coral in the genus B'lphjphyllum of Mr. Lonsdale. As 

 Professor M'Coy very justly remarks, some specimens appear so distinctly dichotomous that 

 they evidently belong to this division, whereas in other specimens the gemmation is quite 

 lateral, as in the common Cyathophylla.' 



This species resembles C. marmin^ by its general arrangement, being in some 

 specimens fasciculate and in others astreiform ; but in the latter fossil the cahces are 

 deeper, and the septa are not only less unequal, but also produce at their upper edge the 

 appearance of an inner wall. The same variations in the general form of the composite 

 corallum is sometimes met with also in C. quadrigeminumf which, however, differs from 

 C. caspitosum by the septa being still more slender, and not bearing any paliform lobes. 



II. Cyathophyllum bolontense. Tab. LII, figs. 1, \a. 



MoNTASTREA BOLONiENSis, BlainvUle, Diet. Sc. Nat., vol. Ix, p. 339, 1830. — Man., p. 394. 

 Cyathophyllum hexagonxjm, Michelin, Icon. Zoopli., p. 181, pi. xlvii, fig. 2, 1845. (Not 



Goldfuss.) 

 LiTHOSTROTiON ARACHNOIDES, UOrbigmj, Prod. de Paleont., t. i, p. 106, 1850. (Not 



Astrea arachnoides, de France.) 

 Cyathophyllum boloniense, Milne Edwards and Jides Haime, Pol. Foss. des Terr. Palaeoz., 



p. 385, pi. 9, fig. 1, 1851. 



Corallum composite, astreiform, forming a subcircular rather flat mass. Calices 

 polygonal, very unequal in size, deep, and separated by thin, straight walls. Forty-two or 

 forty-six septa, almost equal in size, very slender, striated laterally, dehcately denticulated, 

 and straight ; half of them do not extend quite to the centre of the calice, the other 



^ It is surprising that after having recognized these variations the latter author should not have come 

 to a similar result respecting the Diphyphyllum of the carboniferous formation vrhich bear the same relation 

 to Lithostrotions. 



2 Milne Edwards and Jules Haime, Pol. Foss. des Terr. Palseozoiques, p. 38G, pi. ix, figs. 2, 3, 1851. 



3 Goldfuss, Petref. Germ., t. i, p, 59, tab. xix, figs. 1, .5/, and tab. xviii, fig. 6, 1826. 



