b. 
PLATE XI. 
Meropaster Parxinsont, Forbes, sp. (Page 31.) 
From the Upper Chalk. 
. Abactinal aspect; natural size. (Coll. Brit. Mus.) 
. A supero-marginal plate ; magnified 5 diameters. 
. The madreporiform body ; magnified 6 diameters. 
. Abactinal aspect of another example; natural size. (Coll. Brit. Mus.) 
A supero-marginal plate; magnified. 
An abactinal intermediate plate; magnified. 
MeropastEr uncatus, Forbes, sp. (Page 47.) 
From the Upper Chalk. 
. Actinal aspect of a specimen from which the whole actinal floor has been 
removed, showing the inner surface of the abactinal floor; natural size. 
(Coll. Brit. Mus.) 
Abactinal intermediate plates, inner surface ; magnified. 
