54 BRITISH FOSSIL CORALS. 
Lithodendron gibbosum,' and which belongs also to the lower Chalk formation, but is found at 
Bochum, in Westphalia, and at Blaton, near Mons, in Belgium. — It differs from 8. Sharpeana, 
by its calices being more closely set; rather oblong, with a more prominent margin, and 
twenty-four nearly equal, very thick septa, separated by an equal number of rudimentary 
ones. The other is the Madrepora Meyeri, found by MM. Koch and Dunker in the 
Jurassic formation at Elligser-Brinke ; it has deep calices.” 
The unique specimen here described appears to have been found in the lower chalk 
near Dover, and was kindly communicated to us by Mr. Daniel Sharpe. 
Family EUPSAMMID Ai (p. h). 
Genus STEPHANOPHYLIIA (p. Ini). 
STEPHANOPHYLLIA BowrrBaNku. ‘Tab. IX, fig. 4, 4a, 40, 4c. 
STEPHANOPHYLLIA BowERBANKU, Milne Edwards and J. Haime, Monogr. des Eupsammides, 
in Annales des Sciences Naturelles, 3™° série, Zool. 
vol. x, p. 94, 1848. 
Corallum simple, resembling, in its general form, a plano-convex lens. Wai/ 
discoidal and horizontal. Cos/@ numerous, delicate, nearly equal, closely set by pairs, and 
formed by a simple series of granulations, which become the most distinct near the outer edge 
of the mural disc. ‘T'wenty-four of these costz begin near the centre of the corallum, and soon 
after bifurcate ; the forty-eight costae thus produced soon divide again, in the same manner, 
and near the edge of the disc the number of these radiate ridges amounts to ninety-six. 
The mural pores are small, not very distinct, and arranged in series in the intercostal 
furrows. Calice quite circular, and appearing to be regularly convex, excepting towards 
the centre, where there is a shghtly-marked, shallow fossula. Co/uwmel/a almost rudimentary, 
and formed only by two or three trabicule, which are often scarcely distinct from the edges 
of the septa. ‘These last-mentioned organs arise from the upper surface of the mural disc, 
and are thin, especially outwards, closely set, and covered laterally with large, prominent 
granulations. ‘They form five complete cycla, and represent six well-characterised and 
equally-developed systems. The primary and secondary septe are straight, and extend to 
the columella; their upper edge is arched, or slightly angular. The tertiary septa are also 
much developed, and bend towards the secondary ones, to which they become united by 
their inner edge, near the columella. The septa of the fourth and fifth orders, constituting 
the fourth cyclum, are united in a similar way to the tertiary septa, at about half way from 
the margin of the mural disc to the columella, but not exactly at the same point, those of 
1 Petref. Germ., vol. i, tab. xxxvii, fig. 9. 
* Beitrage zur Kenntniss des Norddeutschen oolithgebildes, p. 55, tab. vi fig. 11, 1837. 
