330 PROFESSOR P. M. DUNCAN ON THE 
The septa are not incised on their free margins, and are remarkable, so far as their 
number is concerned, for their very irregular cyclical arrangement. Some primary 
septa are very large, exsert, and project outwards; others of the same cycle are not 
much larger than the secondaries, and barely project at all. 
The costa may be but faint striations, or distinct crests on corallites of the same 
stem; and occasionally not a trace of any other markings than the granulation of the 
wall may be observed. 
The position of the gemmation varies greatly, and may be on the calicular margin, a 
little way down or some distance down the wall on the same corallum; and the rest 
of the corallite varies as much as the other details. 
I cannot understand why Lophohelia should be classified with the Oculinide, whose 
essential peculiarities are given by MM. Milne-Edwards and Jules Haime, Hist. Nat. 
des Corall. vol. ii. p. 102. 
In estimating the value of their differentiation, it must be remembered that lateral 
gemmation is common to other families, that thick imperforate walls are so also, and 
that the thickness of the wall in the Oculinide is not produced by what is termed 
ceenenchyma in the aggregate Astreide. 
The paucity of the peculiar endotheca is not characteristic. But the filling-up of 
the visceral cavity is rather peculiar, and in a general sense may be sufficiently corre- 
lated with the other characteristics to form a structure common to the family. 
A careful examination has not proved that this filling up occurs in Lophohelia. 
Lophohelia, as a genus, possesses entire septa; and as it has endotheca, and no true 
ccenenchyma, it must be associated with the Eusmiliine, amongst the Astreide. 
The groups of the Trochosmiliacez and Euphylliacez will not admit the genus; but 
it is evidently closely allied to the genus Dendrosmilia of the Stylinacee (indépendantes, 
Ed. & H.), op. cit. p. 220. 
I therefore propose to remove the genus Lophohelia from the Oculinid, and to 
re-write its generic diagnosis. 
Family Astreide. 
Subfamily EusMILIIN &. 
Division STYLINACEA. 
Section STYLINACEA INDEPENDENTES. 
Genus LOPHOHELIA. 
The corallum is dendroid, and its gemmation is subterminal and irregularly alternate. 
The wall is very thick. ‘The calices are very deep. The septa are irregular in their 
cyclical arrangement. There is no columella. There are dissepiments, and strong 
well-developed tabule. 
