INTRODUCTION. xxi 



8. Genus Amphelia. 

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



Corallum arborescent, with coalescent branches, and well-developed ccenenchyma in 

 aged parts ; gemmation subterminal, regularly alternate. Calice deep. Columella 

 rudimentary. Septa slightly exsert, entire, and small. No distinct costa ; the surface of 

 the corallum smooth or very delicately striated. 



Typ. sp., Amphelia oculata, nob. ; Madrepora oculata, Esper, tab. xii. 



9. Genus Diplhelia. 



Corallum resembling Amphelia, but having a large columella and denticulated septa. 

 Typ. sp., Diplhelia raristella, nob. Oculina raristella, Defrance, Diet, des Sc. Nat., vol. xxxv, p. 356. 



10. Genus Enallhelia. 

 D'Orbigny MSS. ; Milne Edw. and J. Haime, loc. cit., p. 69, 1849. 



Differs from Amphelia by the shallowness of the calices, a greater development of the 

 septa, and the existence of long costal strise. 



Typ. sp., Enallhelia compressa, D'Orbigny; Lithodendron compressum, Goldfuss, op. cit., tab. xxxvii, 

 fig. 11. 



§ 2. Septa equally developed, and forming apparently a single cyclum. 



11. Genus Axhelia. 

 MUne Edw. and J. Haime, Compt. rend., t. xxix, p. 69, J 849. 



Corallum arborescent, with coalescent branches, and a well-developed ccenenchyma, the 

 surface of which is entirely covered with sub-granulose stria?. Calices very shallow. 

 Columella compact, very thick, and terminated by a rounded tubercle. No pali. Septa 

 exsert, entire. 



Typ. sp., Axhelia myriaster, nob. ; Oculina myriaster, Valenciennes MSS., Catal. of tbe Museum of 

 Nat. Hist, of Paris. 



12. Genus Crypthelia. 



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



Corallum arborescent, flabellate, and unifacial, all the corallites opening on one of the 

 surfaces of the flabellum ; surface of the branches quite smooth. Calices very prominent, 

 pediculate, explanate, and folded in two. No columella nor pali. 



Typ. sp., Crypthelia pudica, Milue Edw. and J. Haime, loc. cit., p. 69. 



