PLATE XXIV. 



From ilie Upper White Chalk. 

 Fig. 1 n. Cyphosoma Konigi, Mantell. A fine specimen, with the spines in situ, 



natural size. British Museum. (P. 131.) 

 lb. „ „ Raraiform spine, natural size. 



1 c. „ „ " do., do., magnified three times. 



1 d. „ „ Bent spine, magnified twice. 



Fig. 2. „ „ Test, with spines. Rev. T. Wiltshire, F.G.S. 



Natural size. 



3 a. „ „ Bent spine ~) 



3 6. „ „ do., magnified six times ^British Museum. 



4. „ „ Spatulate, do. J 



6. „ „ Inter-ambulacral plate, magnified six times. 



7. „ „ Elevated variety. British Museum. 



