698 R. F. TOMES ON THE OOLITIC 
47. A Crrricat and Descrrprrve Last of the Ootrric MADREPORARTA 
of the Boutonnals, By Roserr F. Tomzs, Esq., F.G.8. (Read 
June 25, 1884.) 
[Puate XXXIT.] 
I HAVE been favoured from time to time by M. Rigaux, of Boulogne, 
with specimens of corals for determination, which had been collected 
by him in the Great Oolite and Coral Rag of the Boulonnais. He 
has quite recently very kindly afforded me the additional opportunity 
of studying the whole of his collection of specimens; and the results 
of a comparison made between them and English species will form 
the substance of the present paper. 
It will be observed that I now regard Jsastre@a moneta as a second 
species of Bathycoznia, its very great similarity to the Fairford species, 
Bathycena Slattert, on which I founded the genus, having been 
already noticed by me. The discovery of some forms apparently 
‘ allied to that genus, which nevertheless are found to possess well- 
developed tabule, renders the position of Bathyceenia in the Kusmilinee 
more than doubtful. 
In my paper on the Corals of the Great Oolite, I hazarded some 
remarks, accompanied by explanatory figures, on a species of coral 
from the bottom of the Great Oolite near Stonesfield, which from the 
presence of distinct tabule and the very feeble development of its 
septa, I placed, though not without some hesitation, among the 
Zoantharia Tabulata. For that species, if it proved to be distinct 
from the one on which was founded the genus Cyathophora, the 
generic name Depaphyllum was proposed. But I am still in un- 
certainty as to the proper generic nomenclature of the species, 
because I do not yet know whether the genus Cyathophora of 
Michelin is not possessed of tabule. 
In the collection of M. Rigaux are three distinct forms which, 
though generically distinct from each other, are yet nearly allied, 
and which throw considerable light on the affinities of the Stones- 
field coral, and most likely also on the genus Bathycoenia. 
One of these has a very elongated form, like a long and curved 
horn, with a single terminal and deep calice, the floor of which is 
clearly formed by a tabula, and the septa of which are few in 
number, smooth and somewhat swollen. Another is lenticular or 
discoid, with septa which are swollen like those of the last, though 
they differ very materially in having little prominence. They meetin 
the centre of the visceral chamber, and there is no evidence of tabule. 
The third is a compound coral which, until I had detected the 
tabule, I regarded as closely allied to Bathycenia, although differing 
from it in having external gemmation. ‘These will be described in 
detail further on; but I may here suggest that there appears to be 
considerable similarity between their structure and that of the 
genus of recent corals, Lophohelia, as defined by Prof. Duncan in 
