xxii BRITISH FOSSIL CORALS. 



13. Genus Endhelia. 



Milne Edw. and J. Haime, loc. cit., p. 69, 1849. 



Corallum of the same general form as in the preceding genus, but with the corallites 

 alternate on the branches, which are thick and coalescent. Calices immersed ; their border 

 not projecting, but armed with a tongue-shaped process. No columella norpali. 



Typ. sp., Endhelia Japoniea, Milne Edw. and J. Haime, loc. cit., p. 69 (Mus. of Leyden). 



14. Genus Styl aster. 



Gray, Zool. Miscel., p. 36, 1831; Allopora, Ehrenb., Cor. Roth. Meeres, p. 147, 1834; Dana, op. cit., 

 p. 693, 1846 ; Milne Edw. and J. Haime, loc. cit., p. 69, 1849. 



Corallum arborescent and subflabellate ; ccenenchyma highly developed, smooth, and 

 presenting certain excrescences or tubercles, the nature of which is problematic. Calices 

 rare and not projecting much. Neither columella nor pali. 



Typ. sp., Stylaster rosea, Gray, loc. cit. ; Oculina rosea, Lamarck, op. cit., t. xi, p. 28/ ; Esper., 

 tab. xxxvi. 



Transitional Group. 

 PSEUDOCULINIDtE. 



Corallum composite, with a highly developed, spongy, or cellulose, echinulate, dermic, 

 ccenenchyma. Costal apparatus rudimentary. Walls imperforate, and never invading the 

 visceral cavity. Septal apparatus well developed ; dissepiments few in number. 



This small group participates of the characters belonging to the Oculinidce and the 

 Astreidce, but differs essentially from both. It does not, however, present any important 

 structural peculiarity, and does not appear to be derived from a special zoological type. 



1. Genus Madracis. 



Milne Edw. and J. Haime, Comptes rend, de l'Acad. des Sc, t. xxix, p. 70, 1849. 



Corallum arborescent ; ccenenchyma almost compact, and highly echinulated. Calices 

 unarmed. Columella styliform. Septa exsert and equally developed. 



Typ. sp., Madracis asperula, Milne Edw. and J. Haime, loc. cit., p. 70 ; Dentipora asperula, Gray, 

 MSS. British Museum. 



2. Genus Sttlophora. 



Schweigger, Beobacht. auf Natur., t. v, 1819 ; Sideropqra and Stylopora, Blainville, Manuel d'Actinologie, 

 p. 348, 1830; Sideropora, Milne Edw. and J. Haime, loc. cit., p. 70, 1849. 



Corallum arborescent ; ccenenchyma sub-compact, with a granulated surface. Calices 

 armed with a labial process near the upper part of their margin. Columella styliform. 



Typ. sp., Stylophora pistillaris, Schweigger, loc. cit. ; Madrepora pistillaris, Esper., tab. lx. 



