INTRODUCTION. xix 



Aberrant Group. 

 PSEUDOTURBINOLID^E. 



Corallum simple, with the loculi open and devoid of synapticulae or dissepiments, as in 

 Turbinolidse, but having the septa represented by groups of three vertical lamina?, not 

 adhering together, excepting near their external margin, where they are united by a common 

 costa ; a mode of structure, which is quite anormal in the whole order of Zoantharia, 



Genus Dasmia. 



Milne Edw. and J. Haime, op. cit., p. 328, 1848. 



Corallum subturbinate, and appearing not to be free. Septa strongly granulated. Costa 

 thick, equal, not numerous, and separated by deep grooves. 



Typ. sp., Dasmia Sowerbyi, Milne Edw. and J. Haime, loc. cit., tab. vii, fig. 8. 



Family II. 



OCULINID^E. 



Corallum composite, produced by gemmation, and presenting in general an abundant, 

 compact ccenenchyma or common tissue, the surface of which is smooth, delicately striate 

 near the calices, or slightly granular, but never echinulate. Walls of the corallites com- 

 plete (that is to say, presenting no perforations), not distinct from the ccenenchyma, and 

 increasing by their internal surface, so as to invade progressively the inferior part of the 

 visceral cavity, and to fill it up more or less completely in old age. Locnli imperfectly 

 divided by a few dissepiments ; no synapticulae. Septa entire, or having their upper edge 

 slightly divided. 



§ 1 . Septa of various sizes, forming distinct cycla. 



1. Genus Oculina. 



(Pars) Lamarck, Hist, des An. sans Vert., t. ii, p. 283, 181C; Milne Edw. and J. Haime, Comptes 

 rend, de l'Ac. des Sc, t. xxix, p. 68, 1849. 



Corallum in general arborescent ; gemmation irregular or affecting a spiral disposition ; 

 ccenenchyma highly developed ; its surface smooth, excepting near the calices, where it 

 presents slight radiating stria?. Corallites with the calicc very deep ; a columella well 

 developed, papillose at its apex, and becoming compact towards its basis. Pali corresponding 

 to all the septa, excepting those of the last cycluni. Septa almost entire, slightly exsert, 

 and very unequally developed. 



Typ. sp., Oculina virginea, Lamarck, An. sans Vert., p. 289 ; Madrepora virginea, Ellis and Sol., tab. xxxvi. 



2. Genus Trymhelia. 

 Milne Edw. and J. Haime, Comptes rend, de l'Academie des Sciences, t. xxix, p. 68, 18-19. 



Corallum arborescent, differing from Oculina by the non-existence of a columella, and the 

 great development of the pali, which are cemented together, so as to form a vertical tube. 



Typ. sp., Trymhelia eburnea, Milne Edw. and J. Haime, loc. cit., p. 68. 



