92 BRITISH FOSSIL CORALS. 



the regularity of their structure and the circular form of their calices (figs. 2b, 2c). Some 

 of them are met with in the Lias, and the same generic form appears to have existed in the 

 Triasic period, at St. Cassian ; but those of which the characters are best known all belong 

 to the Oolitic formation. Cladoplnjllia Conyhearii resembles very much C. dicliotoma} to 

 which Prof. M'Coy has referred it ; but we think they arc not specifically identical, for the 

 folds of the epitheca appear to be more developed and more irregular in the Giengen coral 

 than in the Steeple-Ashton fossil ; but the former has only been found in such a bad state 

 of preservation that it is as yet difficult to decide the question. C. Babeancc' differs also 

 but little from C. Conyhearii, but has the tertiary septa less developed and the folds of the 

 epitheca quite horizontal, whereas they are somewhat oblique in the latter species. Etmomia 

 riigosa, D'Orbigny,^ which appears to be also very nearly allied to the above described 

 species, but may be distinguished by the great obliquity of the epithecal folds. CladojjhyUia 

 articidata^ and C. Icevii differ from the former by their thick accretion tumefactions; and 

 C. funiculus^' by the surface of its corallites being quite even and presenting no such 

 swellings. C. lumhricalis' has a much thicker epitheca than C. Conyhearii, and its 

 calices are much larger. Some other fossils mentioned by different authors under various 

 specific names appear to belong to the same group, but have not as yet been satisfactorily 

 characterised and it would, therefore, be useless to dwell upon them here.^ 



Genus Goniocora." 

 GoNiocoRA sociALis. Tab. XV, figs. 2, 2a, 2 h. 



LiTHODENDRON sociALE, F. A. Roemei', Versteiner. des Norddeutschen oolithen gebirges 



Suppl., tab. xvii, fig. xxiii, 1839.^" 

 Dendrophyllia plicata, M'Coy, on some new Mesozoic Radiata, in Ann. and Mag. of Nat. 



Hist., s. ii, vol. ii, p. 403, 1848. 

 ■ GoNiocoRA SOCIALIS, Milne Edwards and /. Haime, Polyp. Palaeoz., &c., p. 96, 1851. 



Corallum composite, dendroid, and presenting in general one or more principal erect 

 stems bearing lateral branches, each of which also gives birth to a series of smaller branches. 



' Lithodendron dichotomum, Goldfuss, Petref., tab. xiii, fig. 3. 



2 Eunomia Baheana, D'Orbigny, Prod., vol. i, p. 292. 



3 Prodr., vol. ii, p. 32. 



'' Lithodendron articulatum, Michelin, Icon., pi. xxi, fig. 1. 



* Lithodendron lave, Michelin, Icon., pi. xix, fig. 8. 



^ Lithodendron funiculus, Michelin, Icon., pi. xix, fig. 7. 



7 Calamophyllia lumhricalis, D'Orbigny, Prodr., t. ii, p. 3. 



^ The list of these fossils is given in the Introduction to our Memoir on Palaeozoic Corals, loc. 

 cit., p. 82. 



^ Milne Edwards and J. Haime, Polyp. Palseoz., &c., p. 96. 



^^ But not the figure given under the same name in the first plate of that work (fig. 3), which appears 

 to be a Rhabdophyllia, and docs not differ from the Lithodendron nanum of the same author. 



