PLATE XL. 



Pygurus Hausmanni, Koch and Bunker. 



From the Coralline Oolite. 



Pygurus Hausmanni, Koch and Bunker, p. 405. The upper surface restored, natural 

 size. Most of the adult specimens of this largest British Oolitic urchin 

 are fractured and distorted, but some of the smaller individuals show 

 the true outline of the test. 



