6 BRITISH FOSSIL CORALS. 
collections of the Geological Society of London, and of MM. Searles Wood, Bowerbank, 
and Frederick Edwards, in London; of the Museum of Natural History, and of 
MM. d’Avchiac, Michelin, and Milne Edwards, in Paris; M. Nyst, at Louvain; M. de 
Koninck, at Liége, &c. 
Genus FLABELLUM (p. Xvill). 
1. Fuasettum Woopit. Tab. I, figs. 2, 2a, 24. 
Funeia spmrtunata,! Searles Wood, Ann. and Mag of Nat. Hist., vol. xiii, p. 12, 1844. 
FLaBELLUM Woopt, Milne Edwards and J. Haime, Monogr. des Turbinolides, Ann. des Se. 
Nat., 3™° serie, vol. ix, p. 267, 1848. 
Corallum simple, erect, rather short, much compressed, especially towards its base, 
cuneiform, subdeltoid, with a peduncle short and rather thick, and lateral edges straight, 
and diverging at an angle of rather less than 90°. All the costz, even the lateral ones, 
simple, flat, equal, indistinct, and crossed by scarcely developed rugze and slight folds 
of the epitheca, which is very thin. The surface of the wall is also marked by small longi- 
tudinal sulci, corresponding to the outer edge of the septa; those referable to the small 
septa but slightly marked. 
Calice having the form of a very long ellipse, and rather arched. In one specimen 
the proportion of its two axes was as 100 : 280, and in another as 100 : 300; the ex- 
tremities of the ellipse corresponding to the great axis are obtuse, and on a level rather 
lower than that of the small axis. The /ossw/a is long, narrow, and deep. 
The cclumella represented only by few large granule adhering to the inner edge of 
the septa, and assuming the form of short, thick trabicule. 
The septa constitute five complete cycla, very well developed, and a sixth cyclum 
mcomplete, more or less rudimentary in some parts, but most apparent in the systems 
situated near the long axis of the calice. The septa of the first three cycla are nearly 
of the same size, and the septal apparatus is therefore divided into twenty-four groups or 
apparent systems, containing each seven septa, or only five, as is often the case when those 
of the sixth cyclum are missing in half of these groups. In general, these minor septa are 
most developed in the half of the lateral groups adjoming the extremities of the long axis 
of the calice, and at the same time the septa of the fourth cyclum enlarge im these groups 
so as to resemble the neighbourmg ones of superior orders, and produce an appearance of 
there being twenty-six or twenty-eight systems ; but in these lateral groups the number of 
septal elements never exceeds three. 
The septa are straight, thin, closely set, and do not rise quite so high as the mural 
1 The Fungia semilunata of Lamarck, to which this fossil was referred by Mr. Searles Wood, belongs to 
the genus Diploctenium of Goldfuss; hence the necessity of giving a new name to the above-mentioned 
species. (See our Monograph of Astreidze, Ann. des Sc. Nat., 3™° série, vol. x, p. 248.) 
