166 BRITISH FOSSIL CORALS. 
Family AULOPORID Ai.’ 
Genus Pyreta.” 
Pyreta Lasecnu. Tab. XLVI, figs. 5, 52. 
Pyrota Lasecui, Milne Edwards and Jules Haime, Pol. Foss. des Terr. Pal., p. 311, 1851. 
Corallum simple, subturbinate, scarcely bent, and sub-pedicellate. pitheca thick, 
and wrinkled transversely. Calice circular and very deep; 30 or 40 septal stria. 
Height 5 lines ; diameter of the calice 23 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 CYATHAXONIDA, (p. lxv.) 
Genus CYATHAXONIA, (p. lxv.) 
CYATHAXONIA CORNU. 
Srytina smmpLe, Parkinson, Introd. to the Study of Foss. Org. Rem., pl. x, fig. 4, 1822. 
Good figure. 
CYATHOPHYLLUM MITRATUM (pars), De Koninck, Anim. Foss. des Terr. Carb. de Belg., 
p- 22, pl. c, figs. 5e, 5f, 1842. (Cet. excl.) 
Not Goldfuss. 
CYATHAXONIA CORNU, Michelin, Icon. Zooph., p. 258, pl. lix, fig. 9, 1846. 
— — Milne Edwards and Jules Haime, Pol. Foss. des Terr. Palzoz., p. 320, 
pl. i, fig. 3, 1851. 
— — M‘Coy, Brit. Palzeoz. Foss., p. 109, 1851. 
— miTrata, D’ Orbigny, Prod. de Pal., vol. i, p. 158, 1850. 
Corallum cylmdro-conical, bent in the form of a horn, pomted 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. Colwmella 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. *1Op:cit.,;, pu ol. 
3 Tbid., Polyp. Paleoz., p. 310, tab. xvii, fig. 8. 
