XX BRITISH FOSSIL CORALS. 
3. Genus CYATHELIA. 
Milne Edw. and J. Haime, loc. cit., p. 68, 1849. 
Corallum arborescent ; gemmation terminal and regularly opposite. Corallites free to a 
considerable distance from the calice, which are grouped in a way similar to that of flowers 
constituting a dichotomous cyme. Columella large and papillose. Pali well developed. 
Septa entire, exsert, and strongly granulated. 
Typ. sp., Cyathelia axillaris, nob. ; Madrepora azillaris, Ellis and Solander, tab. xiii, fig. 5. 
A. Genus ASTRHELIA. 
Milne Edw. and J. Haime, loc. cit., p. 68, 1849. 
Corallum in general arborescent, and resembling Oculina by its form and its mode of 
gemmation, but differmg from the three preceding genera by the non-existence of padi. 
Calice with a deep central fossula. Co/wmella septal ; edges of the septa denticulated. 
Typ. sp., Astrhelia palmata, nob.; Madrepora palmata, Goldfuss, tab. xxv, fig, 6. 
5. Genus SYNHELIA. 
Milne Edw. and J. Haime, loc. cit., p. 68, 1849. 
Corallum arborescent, with thick branches ; gemmation irregular. Cadices very shallow, 
their border scarcely projecting above the surface of the coenenchyma, and united by com- 
mon stria. Colwmella compact, styliform, and termimated by a small tubercle. Septa 
scarcely exsert. 
Typ. sp., Synhelia gibbosa, nob. ; Lithodendron gibbosum, Goldfuss, op. cit., tab. xxxvii, fig. 9. 
6. Genus ACRHELIA. 
Milne Edw. and J. Haime, op. cit., p. 69, 1849. 
Corallum arborescent, or forming a ramified cluster ; gemmation pretty regularly spiral. 
Surface of the ccenenchyma smooth, “excepting in the immediate vicinity of the calices, where 
slight traces of radiating coste are perceptible. Septa extremely exsert, lanceolate, and 
entire ; the principal ones uniting towards the lower part of their mer edge, without there 
being either a columella or pali in the centre of the visceral chamber. 
Typ. sp., Aecrhelia Seba, Milne Edw. and J. Haime, loc. cit., p. 69; Seba, Thes., vol. iti, tab. exvii, fig. 5 
7. Genus LOPHELIA. 
Milne Edw. and J. Haime, loe. cit., p. 69, 1849. 
Corallum arborescent, segregate, with coalescent branches; no true coenenchyma, but 
walls very thick ; gemmation irregularly alternate and subterminal. Ca/ices with a reverted 
lamellar border. Sepéa entire, exsert, and uniting at the bottom of the visceral chamber as 
in the preceding genus. No columella nor pali. 
Typ. sp., Lophelia prolifera, nob. ; Ellis and Sol., tab. xxxii, fig. 2; Oculina prolifera, Lamarck, An. 
sans Vert., vol. il, p. 286. 
