PLATE XXV. 



Ci/phoso mas from the Upper JVhite Chalk. 

 Fig. \ a. Cyphosoma MAGNiFicuM, y/ya^^/^;. Natural size. Rev. T. Wiltshire. (P. 137.) 



I b. „ „ Upper surface, magnified twice. Do. 



1 c. „ „ Under surface, do. Do. 



1 d. „ „ Lateral view, do. Do. 



Fig. 2 a. ,, „ Upper part of areas, magnified four diameters. 



2 b. „ „ Base of ambulacrum, do. do. 



2 c, „ „ Tubercle, magnified six diameters. 



Fig. 3 «. Cyphosoma KoNiGi, Mantell. Mould in flint. Upper surface. (P. 131.) 



3 b. „ „ Do. Under do. 



