MADREPORARIA OF THE BOULONNAIS. 7L1 
to speak on some future occasion. Montlivaltia Rigawai occurs in 
the Cornbrash of Le Wast. 
Genus Crapopuytiia, M.-Edw. & Haime. 
CLapoPHyLiia Basrana, M.-Edw. and Haime,}Pol. Foss. Terr. Paléoz. 
p. 81 (1851); Brit. Foss. Cor. p. 113, tab. xxi. fig. 2. 
From the appearance in the collection of M. Rigaux of only one 
small branch of the present species, obtained from the Great Oolite 
of Hydrequent, it would seem to be rare in the locality. 
Genus SEPTASTRHA, d’Orb. 
SEPTASTRHA RIGIDA, N. sp. 
The corallum is massive, but appears, so far as may be seen by 
the examination of a well-preserved fragment, to have a depressed 
form, with a thin outer edge. 
The calices are remarkable for the small number of their angles, 
which varies from three to five. They are deep, and the walls are 
very clearly defined, straight and prominent. 
The septa are stout, very uniform in thickness throughout, and 
project far into the calice, their margins describing a gentle curve, but 
they do not project far enough to obscure the deep and narrow fossula. 
The interseptal loculi are only a little wider than the thickness of 
the septa. The latter aiternate very regularly with those of ad- 
joining calices, and do not conceal the wall from which they spring. 
A single calice contains about twenty-six septa, of which six pass 
towards the centre of the calice, but leave it open; six others are 
three fourths the length of the first, and the remainder are less than 
half the length of the second. All of them have their edges papil- 
lated, and the papille, like the septa themselves, are very uniform 
in size throughout. 
Fissiparity is frequent, and as two calices may be observed within 
one wall, the calicular surface has much the aspect of that of Lat- 
meeandra, 
The present species appears to bear some resemblance to the 
Septastrea disyar of M. de Fromentel*, but the calices are not much 
more than half the size of those represented in his figure. 
From the Cornbrash, probably of Le Wast. 
Genus ConrusastR mA, d’Orb. 
ConrusastTR@A Riegauxi, n.sp. Pl. XXXII. figs. 20, 21. 
The only specimen in the collection consists of a flake split from 
the side of a corallum, which must have been nearly globular, 
probably of somewhat similar form to the Confusastrwa magnifica 
from the Great Oolite at Fairford, but of rather smaller size. 
The calices are not more than half the size of those of the species 
just named. They are more or less circular or oblong, but some- 
‘times assume a rotundo-triangular form, and are rather deep and 
* Monogr. Polyp. Jurass. Sup. p. 48, pl. vi. fig. 2. 
3B 2 
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