PLATE XXXIX. 



Frotn the Lower Chalk. 



Fig. 1. Salenia Clarkii, Forbes. Apical disc detached, magnified four diameters. 



The Rev. T. Wiltshire, F.G.S. 



Fig. 2 a. Salenia BuNBURYi, i^or^e-?. Test, natural size. Royal School of Mines. 



2 b. „ „ Upper surface, showing disc, magnified two dia- 



meters. 

 2 c. „ „ Under surface, showing peristome, do. do. 



2 d. „ „ Lateral view, showing sides and periprocte, mag- 



nified two diameters. 

 2 e. „ „ Apical disc detached, magnified four diameters. 



.'2 /'. „ ,, Inter-ambulacra entire, do. do. 



2 y. ,, „ Ambulacra do., do. do. 



2 h. ,, ,, Single plate and ambulacra,do. si.x do. 



Single tubercle 



do. 



do. 



