MADREPORARIA OF THE BOULONNAIS. 723 
EXPLANATION OF PLATE XXXII. 
. 1. Discocenia bononiensis, the corallum, natural size. 
Jee , the calice, magnified two diameters. 
3. Ceratocenia elongata, the corallum, natural size. 
4, , the calice magnified, showing its broken margin, smooth 
inner margins to the septa, and its broad and smooth floor. 
5. Scyphocenia staminifera, the corallum, natural size. 
6. , a calice magnified, showing the large, smooth, and peculiarly 
formed septa. 
7. — , another specimen of smaller size, showing external lateral 
gemmation. 
8. excelsa, the corallum, natural size. 
9. . the reverse side of the same specimen, from which a part of 
a corallite has been broken off vertically, revealing well-developed 
tabule. A comparison of this figure with figure 3 of plate vii. 
vol. xxxix. of the Quarterly Journal, will show how nearly the present 
species is allied to a coral from the Great Oolite of Stonesfield. 
10. Trochoseris oolitica, the corallum, natural size. 
te , part of a calice magnified, showing some of the septa and the 
columella. 
12. , some synapticulz, magnified, exposed by the horizontal frac- 
ture of a small specimen. 
13. Bathycenia hemispherica, the corallum, natural size. 
14. , the base, showing the mode of attachment to a shell, and 
the well-developed mural costz. 
15. Montlivaltia Rigauxi, the corallum, natural size. 
16. -——, the calice, natural size. 
17. —— , a septum, magnified, showing the difference in the orna- 
mentation in this and other lenticular Montlivaitie. 
17 a. -——., a portion of a septum, more highly magnified. 
18. Thamnastrea? latimeandroidea, the corallum, natural size. 
19. , a calice, magnified. 
20. Confusastrea Rigauxi, a portion of a corallum, natural size. 
21. , some calices, magnified. 
