Memoirs Carnegie Museum, Vol. VII. 



Plate LI I. 



1 % 





■'^!?-s^-v 







is^' 



'<^^'^?^sC!^^S^l^^S":i'^'-'0i'iiem'^' 



/V in. 



/4 in 



Pygidium. 

 (For detailed explanation of Plate see opposite page.) 



