PLATE LVIII. 



Pygurus Lampas, De la Beche. 



From the Upper Greensand. 



Fig. 1 a. Test, upper surface, natural size. British Museum. (P. 258.) 



b. Do. do. magnified one and a half times. 



c. Do. under surface do. do. 



d. Do. lateral view do. do. 



e. Do. posterior do. do. do. 



/. Do. anterior view of the front of the test, magnified one and a half times. 

 ff. Ambulacral and iuter-ambulacral plates, with poriferous zones, magnified six 

 times. 



