Qj, 
PLATE XVI. 
Meroraster Bowersankul, Forbes, sp. (Page 42.) 
From the Upper (?) Chalk. 
. Abactinal aspect of the example figured by Forbes, natural size. 
Brit. Mus.) 
. Lateral view of the margin ; natural size. 
. The last three supero-marginal plates; magnified 2 diameters. 
. Abactinal intermediate plates ; magnified 6 diameters. 
Meropaster Parxinsoni, Morbes, sp. (Page 31.) 
From the Upper Chalk. 
plate ; magnified 2 diameters. (Coll. Brit. Mus.) 
. Lateral or marginal view of the same; magnified 2 diameters. 
Mirraster rucatus, Morbes, sp. (Page 63.) 
From the Upper Chalk. 
. Abactinal aspect ; natural size. (Coll. Brit. Mus.) 
. A supero-marginal plate; magnified 5 diameters. 
Supero-marginal plates of another example; magnified 2 diameters. 
Brit. Mus.) 
. Abactinal aspect of the example figured by Forbes; natural size. 
Brit. Mus.) 
. Lateral view of the margin ; natural size. 
. A supero-marginal plate; magnified 3 diameters. 
. Profile or sectional view of the margin, showing a supero-marginal and an 
infero-marginal plate; magnified 3 diameters. 
(Coll. 
. A pair of ultimate supero-marginal plates and the odd terminal or “ ocular ” 
(Coll. 
(Coll. 
