Pa AT Ee * Xs 
ACANTHASPIS ARMATUS, Newb. (p. 36). 
Fies. 1,2,3. Cephalic plates, bearing spine. 
2°. Ornamentation, enlarged. 
4. Cephalic plate, inside, natural size. 
Corniferous limestone, Delaware, Ohio. 
ACANTHOLEPIS PUSTULOSUS, Newb. (p. 33). 
5,5°%. Two lateral scutes in natural position, showing outer surface, natural size. 
5°. Four scutes in relative position, much reduced. 
Corniferous limestone, Sandusky, Ohio. 
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