PLATE X. 
Meroraster Parkinsont, Morbes, sp. (Page 31.) 
From the Upper Chalk. 
Abactinal aspect ; natural size. (Coll. Brit. Mus.) 
. Abactinal aspect of another example; natural size. (Coll. Brit. Mus.) 
. A supero-marginal plate; magnified 3 diameters. 
The madreporiform body; magnified. 
. An abactinal intermediate plate, with pedicellarian apparatus; magnified. 
. Actinal aspect of another example; natural size. (Coll. Brit. Mus.) 
. Lateral view of the margin; natural size. 
. Adambulacral plates ; magnified. 
. Actinal aspect of another example; natural size. (Coll. Brit. Mus.) 
. An infero-marginal plate ; magnified. 
. An actinal intermediate plate ; magnified. 
. Abactinal aspect of a young (?) example; natural size. 
. A supero-marginal plate of the same ; magnified 4 diameters. 
. Abactinal intermediate plates; magnified. 
