xliv BRITISH FOSSIL CORALS. 



deep. Columella papillose, well developed. Septa thin, not exsert; the principal ones 

 having their upper margin almost entire, the others strongly dentated. Walls covered with 

 a complete epitheca. 



Typ. sp., Angia rubeola, Milne Edw. and J. Haime, Ann. des Sc. Nat., 3 me serie, vol. x, tab. vii, fig. 6 ; 

 Dendrophyllia rubeola, Quoy and Gaimard, Astrolabe, Zoopb., tab. xv, figs. 12-15. 



75. Genus Cryptangia. 

 Milne Edw. and J. Haime, Comptes rend., t. xxvii, p. 496, 1848. 



Corallum composed of agglomerate, cylindro-turbinate corallites, which appear to mul- 

 tiply by gemmation on a non-persistent, soft stolon, so that they cease to be organically 

 united when in the adult state, but remain imbedded in an extraneous mass composed of 

 Cellepora. Calices circular, with a well-formed fossula. Columella papillose, well developed. 

 Septa thin, not very closely set ; the upper edge of all of them dentate. Walls covered 

 with a complete epitheca. 



Typ. sp., Cryptangia Woodii, Milne Edw. and J. Haime, loc. cit. ; Cladocora cariosa, Wood, Ann. of 

 Nat. Hist., vol. xiii, p. 12. 



76. Genus Rhizangia. 



Milne Edw. and J. Haime, Comptes rend., t. xxvii, p. 496, 1848. 



Corallum increasing by the gemmation of stolons, which sometimes become calicified, 

 and are persistent. Corallites agglomerate, sub-cylindrical. Calices circular ; fossula shallow. 

 Columella papillose, and not very distinct from the neighbouring denticulations of the 

 septa. Septa thin, scarcely exsert, nearly equal, very closely set, with the upper edge 

 slightly arched, and armed with small, regular teeth. Walls covered with a complete 

 epitheca, which extends almost as high as the apex of the septa. 



Typ. sp., Rhizangia brevissima, Milne Edw. and J. Haime, Ann. des Sc. Nat., 3 rae serie, vol. x, t. vii, 

 figs. 7, 8 ; Astrea brevissima, Deshayes, in Ladoucette, Hist, des Hautes Alpes, tab. xiii, fig. 13. 



77. Genus Astrangia. 



Milne Edw. and J. Haime, Comptes rend., t. xxvii, p. 496, 1848. 



Corallum mcrusting. Corallites very short, produced by gemmation on a thin, 

 common, basal expansion, the surface of which is granulated. Calices circular, with a 

 deep fossula. Columella papillose, sub-echinulate and not distinctly delimitated. Septa 

 thin, exsert, nearly equal, granulate, and armed with teeth much resembling those of the 

 columella ; the tertiary septa bent towards those of the second cycla, and united to them. 

 Dissepiments in general simple and distant. Walls naked, with broad, delicately-granu- 

 lated COStcE. 



Typ. sp.. Astrangia Michelinii, Milne Edw. and J. Haime, Ann. des Sc. Nat., 3 me serie, vol. x, t. vii, f. 5. 



73. Genus Phyllangia. 



Milne Edw. and J. Haime, Comptes rend., t. xxvii, p. 497, 1848. 



Corallum differing from those of the preceding genus by the structure of the septa, 

 the upper edge of which is almost entire in the principal cycla, and slightly denticulated in 

 the others. Columella rudimentary. 



Typ. sp., Phyllangia americana, nob. 



