PATE XV: 
MertopasTeR uNcatus, Morbes, sp. (Page 47.) 
Fra. 
la. Actinal aspect ; natural size. (Coll. Wright.) 
b. Lateral view of the margin; natural size. 
Meropaster BowznrBanktl, Forbes, sp. (Page 42.) 
From the Upper Chalk. 
. Actinal aspect ; natural size. (Coll. Geol. Survey.) 
. Lateral view of the margin; natural size. 
An infero-marginal plate (weathered) ; magnified. 
so sa 
. Mouth-plates ; magnified. 
Mirraster Hunter, Forbes, sp. (Page 59.) 
From the Upper Chalk. 
3a. Abactinal aspect ; natural size. (Coll. Brit. Mus.) 
b. A supero-marginal plate; magnified 3 diameters. 
4a. Actinal aspect of another example; natural size. (Coll. Brit. Mus.) 
b. An infero-marginal plate ; magnified 3 diameters. 
c. Extremity of the radial region; magnified 3 diameters. 
d. Abactinal intermediate plates, seen from within; magnified 6 diameters. 
5a. Actinal aspect of another example; natural size. (Coll. Brit. Mus.) 
b. An infero-marginal plate; magnified 3 diameters. 
