MADREPORARIA OF THE BOULONNAIS. ike 
Oolite of Hydrequent and Bléquencque do not differ in any important 
respect from English specimens from Fairford, Burford, Glympton, 
and other localities. 
IsastR#A EXPLANULATA, Milne-Edwards and Haime, Brit. Foss. 
Wor. pt. nu. p. 115, tab. xxiv. fig. 3. 
A portion of a dendroid specimen in very perfect preservation has 
been forwarded by M. Rigaux, which he obtained from the Great 
Oolite at Hydrequent. It resembles with great exactness specimens 
from the Great Oolite of Burford. Another specimen was collected 
at Bléquenéque. 
IsasTRM#A TUBEROSA, 0. sp. 
The present species possesses nearly the same characters as the 
one from the Great Oolite of Rollright and Fairford, to which I have 
given the name of Jsastra Beesleyi ; but its calices are not more 
than one fourth the size of those of that species. 
The corallum is oblong, and of moderate size. The calices are 
nearly circular, and the fossula, which is deep, is round and well 
defined. 
The septa are much exsert and are continuous with those of other 
calices. They are rather thick, and their sides have numerous well- 
defined vertical and prominent ridges, which terminate at the edge 
of the septum and there form papillae. When the calices are worn 
down, the septa are seen to unite in the centre of the calice, and 
form a spurious columella; but this is not visible in the unworn 
ealices. In a well-formed calice there are twenty-four septa, twelve 
of which pass nearly into the fossula, and the other twelve are about 
half their length. 
Greatest diameter of the corallum 2 inches 6 lines; diameter of 
the calices from 1 to 14 line. 
It occurs in the Great Oolite of Hydrequent; but as only one 
Specimen has been forwarded by M. Rigaux, it is presumably not 
abundant. 
I have seen a coral in the Museum at Oxford which I believe is 
identical with this, and which Prof. Prestwich informed me came 
with Mr. Brown’s collection, and was obtained near Cirencester. 
The present species and J. Beesleyi form a small group of Lsastrew 
which differs from ordinary Jsastrwe in haying the septa very much 
exsert and continuous with those of other calices, and in having an 
imperfectly developed wall. Jsastraea depressa has the septa con- 
tinuous also; but they are not at all exsert. 
Genus Latimmanpra, M.-Edw. & Haime. 
LATIM#ANDRA, Sp. 
As with some other species in the collection, the present one is 
represented by one example only. It possesses some peculiarities 
in common with Latimewandra Haimei, such as the particular 
character of the septa, the union of the shorter of these with the 
longer, and the blending together of the principal ones in the centre 
