XXX BRITISH FOSSIL CORALS. 
26. Genus ASTROCENIA. 
Milne Edw. and J. Haime, loc. cit., p. 296, 1848. 
Corallum very dense, and not bearing columnar processes, as in the preceding genus. 
Calices polygonal. Columella styliform, not projecting much. No pali. Septa thick ; ap- 
parently eight or ten systems, two or four of the secondary septa being as much developed 
as the six primary ones. /Vad/s thick and united, as in Styloccenia. 
Typ. sp., dstrocenia Orbignyana, Milne Edw. and J. Haime, loc. cit., p. 297; Astrea formosissima, 
Michelin, Icon., pl. lxxii, fig. 9. 
27. Genus STEPHANOC@NIA. 
Milne Edw. and J. Haime, loc. cit., p. 300, 1848. 
Corallum glomerulate ; the corallites united by their walls, which are thick and 
compact ; gemmation lateral and marginal. Calices subpolygonal. Co/umelia styliform, and 
not projecting much. A coronet of pali, corresponding to the septa of the older cycla. 
Septa scarcely exsert, granulated on their sides, and forming six systems, which are in 
general equally developed. 
Typ. sp., Stephanoceenia intersepta, Milne Edw. and J. Haime, loc. cit., tab. vii, fig. 1; dstrea intersepta, 
Lamarck, Anim. sans Vert., t. i, p. 266. 
28. Genus PHYLLOCG@NIA. 
Milne Edw. and J. Haime, loc. cit., p. 469, 1848. 
Corallum glomerate, astreiform. Coradlites united by the coste and the exotheca, which 
are highly developed. Calices with a free margin, slightly elevated. No colwmella, or only 
traces of a rudimentary one. No pali. Septa very broad, exsert, and forming six 
systems ; gemmation lateral. 
Typ. sp., Phylloceenia irradians, Milne Edw. and J. Haime, loc. cit. ; Astrea radiata, Michelin, pl. xii, fig. 4. 
29. Genus DICHOCENIA. 
Milne Edw. and J. Haime, loc. cit., p. 305, 1848. 
Corallum glomerate, astreiform. Corallites united by a very abundant and dense costal 
coenenchyma, the upper surface of which is subgranulate. Cadzces circular or elliptical, with 
a projecting margin. Columella small. Pali corresponding to most of the septa, which are 
exsert and granulated. Multiplication fissiparous. 
Typ. sp., Dichocenia porcata, Milne Edw. and J. Haime, loc. cit.; Astrea porcata, Lamarck, Anim. sans 
Vert., t. ii, p. 260. 
