CORALS FROM THE CORAL RAG. 91 



As to the various fossils which M. D'Orbigny considers as new species referable to this 

 group, they have not been as yet characterised with sufficient minuteness to be recog- 

 nisable.^ 



Genus Cladophyllia.' 

 Cladophyllia Conybearii. Tab. XVI, figs. 2, 2a, 2b, 2c. 



Caktophyllia cespitosa, Conybeare and W. Phillips, Geol. of England, p. 188, 1822. 

 Coral, like Cakyophyllia cespitosa, Phillips, Illustr. of the Geol. of Yorkshire, vol. i, 



p. 126, 1829. 

 LiTHODENDRON DiCHOTOMUM, M'Coy, Ann. and Mag. of Nat. Hist., s. ii, vol. ii, p. 418, 1848. 



Corallum composite, irregularly cespitose. Its branches obliquely erect, placed at 

 unequal distances, and bifurcating under a very open angle : the two corallites that rise thus 

 from the same parent resemble young individuals that might be produced by calicular 

 gemmiparity rather than by fissiparity. The branches are cylindrical, equal in diameter, 

 alternately somewhat constricted or tumefied, and covered from top to bottom by a 

 complete epitheca. In some parts where this external coating has been w^orn away, the 

 costcB are visible, and assume the form of delicate obtuse, closely set, and equally deve- 

 loped lines. The calices are circular, or nearly so, and the fossula narrow and deep. 

 There appears to exist no indication of a columella. The septa form in general three com- 

 plete cycla, and are broad, thin, not exsert, terminated by an arched, delicately denticulated 

 edge, and granulated laterally. The dissepiments appear to be numerous. 



Diameter of the corallites, 1^ lines; depth of the calicular fossula almost as much. 



This fossil is found at Steeple Ashton, and specimens are in the collections of the 

 Museum of Practical Geology, of the Geological Society, of the Cambridge and Paris 

 Museums, of Mr. Bowerbank, and of Mr. Pratt. 



The genus Cladojjhi/llia Avhich Ave have recently proposed, comprises the Astreina 

 which resemble CalamophjlUa by most of their general characters, but differ from these by 

 the existence of a complete epitheca. The definition of this group is therefore almost the 

 same as that which we formerly gave to Eunomia, but which is not in reality applicable to 

 the species for which Lamouroux established that genus. These corals are remarkable by 



^ Calamophyllia cora/Z/wa, D'Orbigny, Prod., vol. ii, p. 31, C. Luciensis, D'Orb., Op. cit., vol. i, p. 321, 

 and Eunomia contorta, D'Orb., Op. cit., v. ii, p. 32, are species established on specimens, which appear to 

 us undeterminable. C. lumbricalis and C. rugosa, D'Orb., Loc. cit., belong most likely to our genus Clado- 

 phyllia ; Eunomia grandis, D'Orb., Loc. cit., is a Thecosmilia, and we are inclined to think that C. incequalis, 

 D'Orb., Loc. cit., belongs to the family of the Cyathophyllidce. We have not seen the other species of 

 Calamophyllia or Eunomia mentioned by that author. 



2 Polyp. Palseoz., &c. ; in the Archives du Museum, vol. v, p. 81, 1851. 



