xxx BRITISH FOSSIL CORALS. 



26. Genus Astroccenia. 

 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. Walls thick and united, as in Styloccenia. 



Typ. sp., Astroccenia Orbignyana, Milne Edw. and J. Haime, loc. cit., p. 297 ; Astrea formosissima, 

 Michelin, Icon., pi. lxxii, fig. 9. 



27. Genus Stephanocosnia. 

 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. C^'cftssubpolygonal. Columella 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., Stephanocoenia intersepta, Milne Edw. and J. Haime, loc. cit., tab. vii,' fig. 1 ; Astrea intersepta, 

 Lamarck, Anim. sans Vert., t. ii, p. 266. 



28. Genus Phyllocoj:nia. 



Milne Edw. and J. Haime, loc. cit., p. 469, 1848. 



Corallum glomerate, astreiform. Corallites united by the costee and the exotheca, which 

 are highly developed. Calices with a free margin, slightly elevated. No columella, or only 

 traces of a rudimentary one. No pali. Septa very broad, exsert, and forming six 

 systems ; gemmation lateral. 



Typ. sp., Phylloccenia irradians, Milne Edw. and J. Haime, loc. cit. ; Astrea radiata, Michelin, pi. xii, fig. 4. 



29. Genus Dichoccenia. 



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. Calices 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., Dichoccenia porcata, Milne Edw. and J. Haime, loc. cit. ; Astrea porcata, Lamarck, Anim. sans 

 Vert., t. ii, p. 260. 



