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.) 



„ Upper surface, magnified two diameters. 



„ Under surface, do. do. 



„ Lateral view, do. do. 



„ Apical disc, do. four diameters. 



„ Inter-ambulacral area, magnified four times. 



„ Ambulacral area, do. 



„ Single plate and portion of ambulacra, magnified 



six times. 



b. 

 c. 

 d. 

 e. 



/■ 



^■ 

 h. 



From the Upper White Chalk. 

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



b. 

 c. 

 d. 

 e. 



/• 

 a. 



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. 



