PLATE LVI. 



PAOE. 



AcANTHOLEPis pusTULOsus, Newb 08 



Fig. 1! la. Two cranial? plates in their relative positions Natural size. 

 16. Rednced outlines of four plates jiroliably in thiiir r^ lative positions. 



2. Interior surface of plate probably honioiogous with Iff. 



3 Exterior surface of siuall, stronjily tnbeici lated plate corres-pondiof^ to la. 



4. Triangular plate, probably one si('le of a flattened spine. 



5. Slender spine, probably from body 



6. Robust spine, with strooiily sciuamose margin, fioiu body? 



All the figures, except ib. are of the size of nature ; the originals from the Cornifcrons lime- 

 stone at Delawaie and Sandusky, Ohio. 



