PLATE XXIX. 



From the Upper and Lower Chalk. 

 1 a. Cyphosoma spatuliferum, var. The Rev. T. Wiltshire, F.G.S. (P. 141.) 



1 h. „ „ Upper surface of do., magnified twice. 



1 c. „ „ Lateral view of do., do. do. 



1 d. „ „ Areal plates and zones, do. six times. 

 .2 a. Cyphosoma simplex, Forbes. Royal School of Mines. (P. 143.) 



2 b. „ „ Upper surface of test, magnified two and a 



half times. 



2 c. „ „ Upper portion of ambulacra, do. six times. 



3 a. „ „ Another test, magnified three times. 



3 6. „ „ Radiated areolge, magnified eight times, Museum 



of the Royal School of Mines. 



