PLATE XLIII. 



From the Lower White Chalk. 



Fig. 1 a. Salenia granulosa, Forbes. Test, natural size. Dr. Bowerbank's Collection, 



now in the British Museum. (P. 179.) 



b. ,, „ Upper surface, magnified two diameters. 



c. „ „ Under surface, do. do. 



d. „ „ Lateral view, do. do. 



e. „ ,, Apical disc, do. four diameters. 



f. „ ,, Inter-ambulacral area, magnified four times. 



g. „ ,, Ambulacral area, do. 



h. ,, ,, Single plate and portion of ambulacra, magnified 



six times. 



From the Upper White Chalk. 

 Fig. 2 a. Salenia geometrica, Agassiz. Test, natural size. British Museum. (P. 182.) 



b. 

 c. 

 d. 

 e. 



/• 

 St- 



3 a. 

 b. 



Upper surface, magnified two diameters. 



Lateral view, magnified two diameters. 



Apical disc, do. four do. 



Inter-ambulacral area, magnified four diameters. 



Ambulacral area, do. do. do. 



Single plate and portion of ambulacra, magnified 

 six times. 



Mould, in silex, a lateral view, natural size. 

 British Museum. 



Under surface of the same mould, natural 

 size. 



