Cretaceous Dinosaurs 
17 
Fig. 7. Hadrosaurinae indet., unassociated right dentary fragment and coro- 
noid process from Phoebus Landing, ANSP 15306 and 15329, in lingual and 
labial views. Scale in cm. 
worn and has a complete enameled crown and partial root or fang. The 
crown is diamond-shaped, 18.0 mm high and 8.7 mm wide, with a labial- 
lingual diameter of 6.6 mm measured at the base; its superior borders are 
papillated along a slightly raised edge. The median carina is straight and 
relatively low and not accompanied by secondary ridges. The angle be- 
tween crown and root is nearly 140°, in agreement with the hadrosaurine 
condition as described by Sternberg (1936); on the other hand, the ratio 
between width of crown and labial-lingual diameter is characteristic of 
the lambeosaurines. The same discrepancy was pointed out by Langston 
(1960) in his description of the dentary teeth of Lophorothon atopus. Despite 
this curious point of similarity, however, we feel that a positive assign- 
ment of the North Carolina tooth to Lophorothon would be unwarranted. 
