Ply FASE XOX XV alt 2 
ONYCHODUS SIGMOIDES, Newb. (p. 56). 
Fic. 1. Dentary bone, inner surface, natural size. 
14 1>. Seales, inner and outer surfaces. = 
2. Dentary bone, outer surface, showing crest of intermandibular teeth in position, 
natural size. 
2. Ornamentation of outer surface, enlarged. 
3. Intermandibular arch of small individual, 
4. Dentary bone of small individual, outside. 
4, Cross-section of 4. 
All from Corniferous limestone, Delaware, Ohio. 
302 
