PLA Ey Xai 
RHIZODUS ANCEPS, Newb. (p. 191). 
Fic. 1. Anterior ha.f of mandible, natural size. Saint Louis limestone, Alton, Ill. 
DrInicHTHYsS TERRELLI, Newb. 
2. Pineal fontanelle, inside, natural size. Cleveland shale, Sheffield, Ohio. 
DINICHTHYS MINOR?, Newb. (p. 149). 
3. Pineal fontanelle, natural size. Cleveland shale, Sheffield, Ohio. 
TITANICHTHYS CLARKU, Newb. (p. 183). 
4. Tooth ?, side view. 
4*. Section, natural size. 
Cleveland shale, Berea, Ohio. 
316 
