110 BRITISH FOSSIL CORALS. 
By an attentive examination of Goldfuss’s corals in the Poppelsdorf Museum, and in 
the cabinet of Professor Bronn, at Heidelberg, we have been able to ascertain that the 
Astrea sexradiata, Goldfuss,' belongs to this small group, but the specimen figured is in a 
very bad state of preservation. The genus Converastrea contains, therefore, at present 
three species, and the one here described differs principally from the two others by the less 
regular form and the thickness of the septa, and by these laminz being less exsert. 
Family ASTREID A, (p. xxiii.) 
Genus MONTLIVALTIA, (p. XXV.) 
1. Montiivattia Smirar. Tab. XXI, figs. 1, la, 10. 
MADREPORA TURBINATA, Syth, Strata identified by Organic Fossils, p. 84, tab. Upper Oolite, 
fig. 3, 1816, (appears to be a specimen, the wall and the basis of which have been worn 
away.) 
Corallum simple, short, fixed by a large basis, which is somewhat expanded. Wall a 
little constricted near the basis, and covered with a thick epitheca which extends to a short 
distance from the calicular margin. Ca/ice regularly circular; fossula not very deep, but 
well defined. In general five complete cycla of septa, but sometimes the last cyclum is 
quite rudimentary in one half of each system, The septa are exsert, very strong, broad, 
quite straight, and very closely set. Those of the first three cycla are almost of the same 
size, and extend to the centres of the visceral chamber; those of the fourth cyclum are 
also large, and those of the last cyclum are much smaller, but remain always free from any 
adherence at their inner edge. The lateral surfaces of the septa appear to be strongly 
striated, and their upper edge was probably denticulated originally, but had become quite 
smooth by wear in the two specimens here described. Diameter of the calice one inch 
three lines ; height, seven lines in one specimen, and more than an inch in the other. 
These corals were found near Bath and communicated to us by Mr. Pratt. The fossil, 
which appears to belong to the same species, and is figured in Mr. Smith’s work, was found 
at Farley. 
Montlivaltia Smithi differs from most of the other species belonging to the same genus 
by the thickness of its seyfa and its broad, short form. It resembles most our IZ, Wright,” 
but this fossil does not appear to have been fixed by a large basis, and its sepfa are more 
numerous and more unequal im size. 
1 Petref. Germ., vol. i, tab. 24, fig. 9; Convexastrea sexradiata, Milne Edwards and J. Haime, Polyp. 
Palzoz., ete., p. 63. 
2 Tab. xxvi, fig. 12. 
