Lge Ds 1S DOG OIE ES 
DINICHTHYS TERRELLI, Newb. 
Inside view of anterior portion of right mandible, very large and much worn by use; a frag- 
ment broken off by violence and found buried in the soft carbonaceous mud which once 
formed the sea bottom, and is now the Cleveland shale, natural size. 
Sheffield, Lorain County, Ohio. 
296 
