PLATE XLIX. 



Fig. 1. External view of the right mandible of Eryops willistoni. X V2- 

 Drawing by S. Prentice, a = articular; c = coronoid. 



Fig. 2. Maxillary tooth of Eryops willistoni. X V2. 



Fig. 3. Fragment of cranium, including portion of right orbit and show- 

 ing very distinctly the suture bounding the anterior border of the right 

 frontal. A portion of the supraorbital lateral line canal may be also 

 detected. X %• O = orbit. 



Fig. 4. Cross section of mandibular tooth, showing pulp cavity and dental 



tubules. X 2. 

 Fig. 5. External view of anterior portion of the right mandible, x *^- 



