MADREPORARIA OF THE BOULONNAIS. 703 
Genus CERATOC@NIA, n. g. 
(Fam. Astraide ; Subfam. Lusmiline.) 
The corallum is simple, much elongated, and horn-shaped, and 
appears to have been produced to a slender point at its inferior 
extremity. 
It has a thin but regular epitheca. 
The calice is very deep, round, and has a central level space upon 
which the septa do not encroach. 
The septa are few in number, in six systems, and are thick, 
swollen, and wholly without ornamentation. The primary ones 
are considerably developed, while those of other cycles are small 
and irregular. 
Only one example has been examined, the lower end of which, as 
well as one side of the calice, and the whole of its upper margin, 
has been broken away. 
The exact relationship of this singular coral cannot be determined 
without better specimens than the one met with; but sufficient may 
be learned from this to establish its distinctness from any genus at 
present known, and to point out its resemblance to Scyphocenia. 
The difference between the two genera consists in the one being 
simple while the other is compound. 
CERATOCENIA ELONGATA, n.s. Pl. XXXII. figs. 3, 4. 
The corallum is elongated, curved, and the inferior extremity, 
which is broken off, appears to have terminated in a point, which 
was probably one of attachment. 
In the present somewhat worn state of the corallum, the epitheca 
cannot be easily studied, but the rather numerous annular ridges 
which appear on the whole length of the corallum, indicate the 
existence of one, and the broad and rounded longitudinal ridges 
which correspond with the septa point out the number and form of 
the several coste. 
The calice is round, and very deep, and all the central part is free 
from the encroachments of septa, and nearly flat. 
In the half of the calice which remains, there are six septa, of 
which three are primary and are prominent. The other three have 
very varying degrees of development, from a prominence only a 
little less than that of the primary ones, to an almost rudimentary 
condition. None of them pass on to the central floor of the calice. 
The height of the corallum is 2 inches, and the diameter of the 
calice 5 lines.* It was obtained from the Great Oolite of Hydrequent. 
Genus ScyPHOC@NIA, n. g. 
(Fam. Astrwide ; Subfam. Husmiline.) 
The corallum is composite, and the corallites are united by their 
walls, but are sometimes divided into clusters. It is peduncular, 
lobular, and expanding, and attached by a small point. The outer 
or common wall is either naked and costulated, or it has a small 
