130 BRITISH FOSSIL CORALS. 
compressed and oval. JV. ¢rochoides has more general resemblance to a certain number of 
species of a somewhat conical form, which have five or six cycla of septa, such as J/. dispar, 
M. tenuilamellosa, &c. The first of these fossils, however, differs from it by having a less 
regular form, a shallower fossula, and fewer septa; JZ. tenwlamellosa® is shorter, its 
epitheca does not extend so high, and its septa are thinner and curved inwardly ; 
M. Wright has thicker and more equally developed septa; JZ. Lotharinga* has its basis 
arched and often inflated; J/. Goldfussiana’ is always adherent; J. Guerangeri® has a 
thicker but very incomplete epitheca; and in J/. Beawmonti’ the septa are more numerous 
and fluted laterally. 
2. MonTLIVALTIA TENUILAMELLOSA. Tab, XXVI, figs. 11, lla. 
Corallum subturbinate, short, broader than high, somewhat inflated, straight, or very 
slightly subpedicellate. pitheca very thick, extending over only two thirds of the height 
of the corallum, and presenting strong circular wrinkles. Ca/ice circular or nearly so, and 
slightly convex ; fossula oval and very deep. Septa very thin, terminated by a very 
delicately denticulated edge, almost smooth laterally, and forming six complete cycla; those 
of the first three cycla almost equally developed; many of them somewhat bent towards the 
centre of the visceral chamber, Height one inch, Diameter two inches. 
This fossil was found in a bed of Fullers Earth at Dunkerton, and at English Batch, 
by Mr. Walton. 
The general form of this coral renders it easy to be distinguished from most of the 
species of the genus Montlivaltia ; those which it resembles most, are J. ponderosa, 
M. brevissima, M. Waterhousei,® and MW. regularis," but the first of these fossils is much 
more oblong, has a thin and almost smooth epitheca, reaching almost to the calicular 
margin, and straight septa; in the second the epitheca is also almost complete and smooth, 
and there are only five cycla of septa; in the last two the corallum has much the same in 
form towards its basis, but becomes cylindrical higher up, and the septa are stronger and 
more numerous. 
! Tab. xiv, fig. 2. 2 Tab. xxvi, fig. 11. 3 Tab. xxvi, fig. 12. 
4 Milne Edwards and J. Haime, loc. cit., p. 294. 5 Ib., loc. cit. 
6 Ib:, op. cit., p» 293. 7 Ib., Ann. des Sc. Nat., s. 3, vol. xi, p. 243. 
8 Thecophyllia ponderosa, Milne Edwards and J. Haime, Ann. des Se. Nat., 8. 3, vol. xi, p. 242. 
9 Milne Edwards and J. Haime, op. cit., vol. x, p. 293. 10 Tab. xxvii, fig. 7, 
11 D’Orbigny, Prod. de Paléont., vol. i, p. 349. 
