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., dagia rubeola, Milne Edw. and J. Haime, Ann. des Sc. Nat., 3™° série, vol. x, tab. vii, fig. 6 ; 
Dendrophyllia rubeola, Quoy and Gaimard, Astrolabe, Zooph., 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 m an extraneous mass composed of 
Cellepora. Calices circular, with a well-formed fossula. Co/umedla 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. Cora/lites agglomerate, sub-cylindrical. Cadices circular ; fossula shallow. 
Columella papillose, and not very distinct from the neighbouring denticulations of the 
septa. Sepa thin, scarcely exsert, nearly equal, very closely set, with the upper edge 
slightly arched, and armed with small, regular teeth. /Val/s 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 Se. Nat., 3™° série, 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 imerustnng.  Corallites very short, produced by gemmation on a thin, 
common, basal expansion, the surface of which is granulated. Ca/ices circular, with a 
deep fossula. Columel/a papillose, sub-echinulate and not distinctly delimitated. Septa 
thin, exsert, nearly equal, granulate, and armed with teeth much resembling those of the 
colunella; the tertiary septa bent towards those of the second cycla, and united to them. 
aiid in general simple and distant. Walls naked, with broad, delicately-granu- 
ated coste. 
Typ. sp., Astrangia Michelinii, Milne Edw. and J. Haime, Ann. des Sc. Nat., 3™ série, vol. x, t. vii, f. 5. 
78. Genus PHYLLANGIA. 
Milne Edw. and J. Haime, Comptes rend., t. xxvii, p. 497, 1848. 
Corallum differmg from those of the preceding genus by the structure of the sepda, 
the upper edge of which is almost entire in the principal cycla, and slightly denticulated in 
the others. Co/wmell/a rudimentary. 
Typ. sp., Phyllangia americana, nob. 
