166 BRITISH FOSSIL CORALS. 



Family AULOPORID^. 1 



Genus Pyrgia. 2 



Pyrgia Labechii. Tab. XLVI, figs. 5, 5«. 



Pyrgia Labechii, Milne Edwards and Jules Haime, Pol. Foss. des Terr. Pal., p. 311, 1851. 



Corallum simple, subturbinate, scarcely bent, and sub-pedicellate. Epitheca thick, 

 and wrinkled transversely. Calice circular and very deep; 30 or 40 septal striae. 

 Height 5 lines ; diameter of the calice 2^ lines. 



Found at Frome. Specimens are in the Museum of Practical Geology, &c. 



The genus Pyrgia is composed of corals which may be considered as being simple and 

 free Aulopora. 



It comprises two species ; the above-described fossil and P. Michelini? which differs 

 from the first by the existence of a long horizontal peduncle and one or two small spur- 

 like radiciform processes. 



Family CYATHAXONIDJE, (p. lxv.) 



Genus Cyathaxonia, (p. lxv.) 



Cyathaxonia cornu. 



Stylina simple, Parkinson, Introd. to the Study of Foss. Org. Rem., pi. x, fig. 4, 1822. 



Good figure. 

 Cyathophyllum mitratum (pars), Be Koninek, Anim. Foss. des Terr. Carb. de Belg., 



p. 22, pi. c, figs, be, of, 1842. (Cset. excl.) 



Not Goldfuss. 

 Cyathaxonia cornu, Michelin, Icon. Zooph., p. 258, pi. lix, fig. 9, 1846. 



— — Milne Edwards and Jules Haime, Pol. Foss. des Terr. Palseoz., p. 320, 



pi. i, fig. 3, 1851. 

 _ _ M'Coy, Brit. Palaeoz. Foss., p. 109, 1851. 



— mitrata, TfOrbigny, Prod, de Pal., vol. i, p. 158, 1850. 



Corallum cylindro-conical, bent in the form of a horn, pointed at the basis, and 

 surrounded with a thin epitheca which has some slight circular wrinkles, but is never 

 echinulated. Calice circular, rather deep, and with thin margins. Columella cylindrico- 

 conical, very prominent, slightly compressed, and compact, but having a small central 

 canal. Septal fossula narrow, but well defined. Septa very thin, narrow at their upper 



1 Milne Edwards and Jules Haime, Pol. Foss. des Terr. Pal., p. 310, 1851. 2 Op. cit., p. 310. 



3 Ibid., Polyp. Palseoz., p. 310, tab. xvii, fig. 8. 



