88 BRITISH FOSSIL CORALS. 
from the calice, shows a Colwmella of a spongy texture (fig. 34), and three complete cycla 
of septa, independently of the rudiments of a fourth cyclum in two of the systems; so 
that it appears probable that there may be four cycla in the calices which are ready to 
multiply by fissiparity ; the sepfa are thin, not closely set, slightly tumitied near their inner 
edge, sometimes flexuous, and but slightly granulated laterally ; the secondary ones in the 
small systems, and even the tertiary ones in the most developed systems, are almost as 
large as the primary ones, but those of the last cyclum are much smaller and often even 
rudimentary. The wad/, although not very thick, is well formed. The dissepiments appear 
to be rudimentary. 
We do not know to what height this coral may grow; the calices are from two to three 
lines in diameter, and the distance between the successive fissiparous generations varies 
from seven lines to an inch. } 
We have seen three specimens of this species: two were found at Malton, and belong, 
the one to our friend Mr. Bowerbank, the other to the Cambridge Museum; the third was 
presented to the Geological Society by Sir Roderick Murchison, and had been found in the 
Coral Rag of Cumnor Hill. If, as we are inclined to think, the fossil coral, mentioned by 
Mr. Phillips as resembling the Madrepora flecuosa of Ellis and Solander, belongs to this 
species, we must also add to these localities Hackness, in Yorkshire. 
The genus Rhabdophyllia, which we have recently established’ for a certain number 
of arborescent Astreidee that multiply by fissiparity, and have naked costulated walls, 
differs from Calamophyllia by the absence of mural rings, the existence of a well-charac- 
terised columella, and the rudimental state of the interseptal dissepiments. This group is 
essentially composed of a small number of species belonging to the Coral Rag, and we 
also include in it an ill-defined species found at St. Cassian, and described by Count 
Munster. 
Mr. M‘Coy refers this British species to the Rhabdophyllia Edwardsi,’ which, as far as 
ran be seen by the figure given by M. Michelin, is certainly very much like it; but we are 
of opinion that these fossils are not identical ; the latter appears to differ from 2. Phillipsi 
by the corallites being more regularly cylindrical and having thicker costee. 2. undata® 
and 2. nodosa* differ from the above-described species by the alternate constrictions and 
1 Polypiers Fossiles des terr. Paleeoz., p. 83. 
2 Lithodendron Edwardsti, Michelin, Icon. Zooph., tab. xxi, fig. 2. 
5 Calamophyllia undata, D’Orbigny, Prod., vol. ii, p. 31, This species having been very briefly noticed 
by M. D’Orbigny, it may be useful to point out its most essential characters : 
Corallum arborescent ; branches almost cylindrical, dichotomous or trichotomous; coste straight, 
nearly equal, projecting but little, closely set, and formed by a single series of granulations. The corallites 
presenting a series of alternate constrictions, and thick, circular, obtuse ridges. Sepfa thin and numerous. 
Margin of the ecalice irregular. Diameter 7 or 8 lines. From the Coral Rag of Wagnon, Ardennes. 
* Calamophyllia nodosa, D’Orbigny, Prod., vol. ii, p. 32. Species very nearly allied to the preceding 
one, but with the circular tumefactions of the walls placed with less regularity and more prominent. Costal 
strize very delicate, and of unequal size alternately. Diameter, 5 lines. From the Coral Rag at Oyonnax 
and Landeyron, Departement de Ain, France. 
