Ixvii BRITISH FOSSIL CORALS. 
12. Genus CYATHOPHYLLUM. 
Goldfuss (in parte), Petref. Germ., vol. i, p. 54, 1826. 
Corallum simple or composite. No cosfe. Septa well developed, extending to the 
centre of the calice, and twisted together so as to produce the appearance of a small colu- 
mella. Zadbule occupying only the centre of the visceral chamber; the outer portion of 
which is filled up with numerous vesicular dissepiments. A single wall, situated exteriorly, 
and provided with a complete epitheca. 
Typ. sp., Cyathophyllum helianthoides, Goldfuss, loc. cit., tab. xx, fig. 2. 
13. Genus PACHYPHYLLUM. 
Corallum composite, and increasing by lateral gemmation. Cora/lites united in their 
lower portion by means of the great development of the costa and the exotheca, and not 
delimitated by an individual epitheca. Zadude well characterised. 
Typ. sp., Pachyphyllum Bouchardi, nob. 
yp- 8p yplry 
14. Genus CAMPOPHYLLUM. 
Corallum simple, very tall, and protected by an epitheca. Septa well developed. 
Tabule very large, and smooth towards the centre. Interseptal loculi filled with small 
vesicule. 
Typ. sp., Campophyllum flecuosum ; Cyathophyilum flecuosum, Goldfuss, Petref. Germ., vol. i, tab. xvii, 
fig, 3. 
15. Genus SrREPTELASMA. 
Hall, Paleeont. of New York, p. 17, 1847. 
Corallum simple, and differig from Cyathophyllum by the structure of the wall, which 
is destitute of epitheca, and covered with sublamellar coste. 
Typ. sp., Streptelasma corniculum, Hall, loc. cit., tab. xxv, fig. 1. 
16. Genus OMPHYMA. 
Rafinesque and Clifford, in Ann. des Se. Phys. de Bruxelles, vol. vy, p. 234, 1820. 
Corallum simple, turbinate. Wall provided with a rudimentary epitheca, and pro- 
ducing radiciform appendices. Sepfa very numerous, equally developed, and divided into 
four groups by an equal number of shallow septal fossulae. Zaéule well developed, and 
smooth towards the centre. 
Typ. sp., Omphyma turbinata ; Madrepora turbinata, Lin. Ameen. Acad., vol. i, tab. iv, fig. 2. 
