708 R. F. LOMES ON THE OOLITIC 
described by M.de Fromentel under the name of Cryptocenia brevis*, 
which has also eight principal septa, but differs from it in several 
respects. The calices are larger, there are fewer cycles of septa. 
Moreover, in the description of C. brevis, no mention is made of the 
crowded and cristiform intercalicular costae, which are so charac- 
teristic of the present species, and which at first sight led me to 
place it in the genus Convexastrwa. That it is a Cryptocenia I do 
not, however, entertain any doubt; but its resemblance to Convew- 
astrea is so great as seriously to endanger the value of that 
genus. 
Height of the corallum 1 inch 3 lines, its diameter 10 lines. 
Diameter of the calices 13 line; from centre to centre of the calices 
2 lines. 
CRYPTOCHNIA MICROPHYLLA, Tomes, Quart. Journ. Geol. Soc. vol. 
XXKIK i. Gelato 2, 
A specimen of small size and giobular form appears in the 
collection. It was obtained from the Great Oolite of Hydre- 
quent. 
CRYPTOC@NIA, sp. 
A single specimen of small size, and in a much damaged state, 
is all I have been favoured with of this species, which is obviously a 
well-marked one. [am unable further to describe it than to say 
that the corallum is small and nearly globular, and has a great 
many small and much-crowded calices, and that the intercalicular 
costze, so far as may be observed, bear considerable resemblance to 
those of Conveaastrea. I am unable to give its locality. 
Genus Sryiuva ? 
STYLINA, sp. ? 
A fragment only of a dendroid coral, in an unfavourable con- 
dition, is all I have seen to lead me to include the genus Séylina in 
the Cornbrash of Le Wast. It was received with other species from 
Le Wast by the kindness of M. Rigaux, and closely resembles in its 
details a coral figured by Quenstedt in his recently published work 
on the fossil corals of Germany, under the name of Astrwa coronart. 
The specimen figured by Prof. Quenstedt was obtained from the 
Coral Rag of Menziéres. 
Genus Montrivartia, Lamx. 
It may be remarked of this genus, the representatives of which 
are so abundant in the Jurassic formations, that very few flourished 
in the sea of the period of the Great Oolite; and the species from 
the district now under consideration do not detract from the truth 
of that observation, two only appearing in the collection made by 
M. Rigaux. 
* Introd. Etude Polyp. Foss. p. 199. 
t Petrefact. Deutschlands, sechster Bd. p. 776, tab. 173. fig.25. 
