PLATE XXXIX. 



From the Lower Chalk. 



Fig. 1. 



<'ig. 2 a. 



Saleni.\ Bunburyi, Forbes 



2 b. 



2 c. 

 2 d. 



2 e. 



■Iff. 

 •2 h. 



•1 ; 



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



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



Test, natural size. Royal School of Mines. 



Upper surface, showing disc, magnified two dia- 

 meters. 



Under surface, showing peristome, do. do. 



Lateral view, showing sides and periprocte, mag- 

 nified two diameters. 



Apical disc detached, magnified four diameters. 



Inter-ambulacra entire, do. do. 



Ambulacra do., do. do. 



Single plate and ambulacra.do. six do. 



Single tubercle do. do. 



