aR 9° eo 8 
5d. 
b. 
. An ultimate paired supero-marginal plate seen from above; magnified. 
. The same seen in profile (lateral view); magnified. 
PDA OX e 
Morropaster unoatus, Forbes, sp. (Page 47.) 
From the Upper Chalk. 
. Abactinal aspect; natural size. (Coll. Brit. Mus.). 
. An ultimate paired supero-marginal plate ; magnified. 
. Abactinal aspect of another example; natural size. (Coll. Brit. Mus.) 
. Lateral view of the margin; natural size. 
A supero-marginal plate ; magnified. 
. The madreporiform body ; magnified 4 diameters. 
Actinal aspect ; copied from the figure given by Forbes in Dixon’s ‘ Geology 
of Sussex’ (pl. xxi, fig. 5). 
Meropaster cincutatus, Sladen. (Page 53.) 
From the Upper Chalk. 
. Abactinal aspect; natural size. (Coll. Brit. Mus.) 
. Lateral view of the margin ; natural size. 
. A supero-marginal plate; magnified. 
. An abactinal intermediate plate; magnified. 
MeropastTer cornutus, Sladen. (Page 55.) 
Abactinal aspect; natural size. 
Lateral view of the margin; natural size. 
