208 BRITISH FOSSIL CORALS. 
arched, slightly inclined inwards, broader than high, and bear on their surface small 
rudiments of costal prolongations. A horizontal section usually passes through three of 
these vesicles in the space comprised between the two walls, and shows that the dissepi- 
ments in the inner zone are simple, almost horizontal, or slightly arched, and placed at 
about half a line apart. 
Found in Derbyshire, in Russia, and in North America. Specimens are in the 
collection of M. de Verneuil. 
This species much resembles LZ. floriformis,' but differs from it by its columella being 
less stout and less prominent, and by its rudimentary costal radii. It differs from 
L. Bronni’ by the unequal development of its septa, and from Z. rugosa’ and L. duplicata* 
by the fasciculate forms of these two latter species. 
3. Lonspauera RuGosa. Tab. XX XVIII, fig. 5. 
Lonspaura RuGosA, M‘Coy, Ann. and Mag. of Nat. Hist., 2d series, vol. iii, p. 13, 1849. 
— — Milne Edwards and Jules Haime, Pol. Foss. des Terr. Paleeoz., p. 461, 
1851. 
—_ — M‘Coy, Brit. Paleeoz. Foss., p. 105, pl. 118, fig. 6, 1851. 
Corallites in general free laterally, sub-cylindrical, having very strong circular growth 
swellings, and covered with a very thick epitheca. Colwmella broad. Septa thin, and 
almost equal, about 10. Diameter of the Corallites very variable ;—the largest about 
8 lines. 
Found at Mold and Corwen. Specimens are in the collections of the Museums of 
Practical Geology, of Cambridge and of Paris. 
This species differs from Z. Bronai,’ L. floriformis,© and L. papillata,’ by the 
tendency of the Corallites to remain free laterally; and from Z. duplicata,’ which it 
resembles in that respect, by the irregular tumefactions of the surface of the walls of the 
corallites. 
1 See tab. xliii, figs. 1, 2. 
2 Milne Edwards and Jules Haime, Polyp. des Terr. Palzeoz., tab. xi, fig. 1. 
3 M‘Coy, Brit. Palzeoz. Fossils, p. 105. 
4 Lonsdalia crassiconus, M‘Coy, Ann. and Mag. of Nat. Hist., 2d ser., vol. iii, p: 12. Erismatolithus 
duplicatus, Martin, Petrif. Derb., pl. xxx. 
® Milne Edwards and Jules Haime, Polyp. Paleeoz., tab. xi, fig. 1. 
6 See tab. xliii, figs. 1, 2. 7 Milne Edwards and Jules Haime, op. cit., tab. xi, fig. 2. 
8 Lonsdalia crassiconus, M‘Coy, Aun. of Nat. Hist., 2d series, vol. ii, p. 12. 
