7t2 R. F. TOMES ON THE OOLITIC 
open, the septa being exsert only near to the mural line. Between all 
of them there is a well-defined and depressed line, corresponding 
with the upper margin of the wall. The septa are extremely deli- 
cate, having only the thickness of a hair. They do not exceed in 
this respect those of Anabacia complanata. 
The costee covering the common or investing wall (those of the 
side of the corallum alone being observable in the fragment) are 
continuous with the septa of the contiguous calices ; but none of the 
septa join with those of other calices, there being | a distinct break 
in the depression between the calices. Both septa and coste are 
closely and regularly papillated, the papille having a direction across 
the septum. 
The cycles are difficult to count, but in a full-sized calice there 
are more than one hundred septa, the greater number of which 
meet in the centre of the calice, but do not blend. 
Gemmation is observable between the calices. 
Diameter of the calices 3 to 4 lines. 
Compared with C. tenwistriata from the Inferior Oolite, it differs 
in having the corallum more globular, the calices smaller and much 
deeper, and the septa and septal coste much thinner, more nume- 
rous, and much more closely papillated. The extreme delicacy 
of the septa would alone distinguish the present species from all 
others. 
The only specimen received was obtained from the Great Oolite at 
Rety. 
ConFUSASTRZA MAGNIFICA, Tomes, Quart. Journ. Geol. Soc. vol. xxxix. 
p- 184, pl. vii. figs. 15 & 22 (1888). 
After a careful comparison of a specimen forwarded by M. Rigaux 
with the type specimen of C. magnifica, 1 am unable to determine 
that there are sufficient differences to constitute a new species. The 
French specimen, however, differs from the one: from Fairford in 
having a concaye instead of a peduncular base, and in having the 
calices rather more prominent and their central region more 
open. 
: The specimen examined came from the Cornbrash of Le Wast. 
CoNFUSASTRZA, Sp. 
A very much worn coral from the same locality as the last; differs 
from it in having calices which are fewer in number and of 
twice the size. Two of these are so ill-defined the one from the 
other as to lead to the supposition that they are confluent, as in 
Chorisastrea. Better specimens are needed to determine the true 
affinities of this coral, though it may be confidently regarded as di- 
stinct from any other species here mentioned. 
Genus Isastrma, M.-Edw. and Haime. 
IsaAsTR#A LImITATA, Lamx., in Michelin. 
The specimens from the Cornbrash of Le Wast, and the Great 
