180 0. C. Marsh — Cretaceous Mammalia. 



The fossils here briefly noticed are from the same horizon in 

 the Laramie as those previously described by the writer. Most 

 of them are from the same localities, which have been very 

 carefully explored by Mr. J. B. Hatcher and party. In this 

 work, important aid has been rendered by Dr. C. E. Beecher, 

 assistant in the Yale Museum. 



New Haven, Conn., July 25th, 1889. 



Explanation of Plates. 



Plate VII. 



Figures 1-4. — Upper molar tooth of Gimolomys digona, Marsh. 



Figures 5-8. — Upper molar of Selenacodon fragilis. Marsh. 



Figures 9-12. — Upper molar of Selenacodon brevis, Marsh. 



Figures 13-16 — Premolar of Cimolomys digona. 



Figures 17-21. — Upper premolar of Stagodon lumidus, Marsh. 



Figures 22-25. — Lower molar of Stagodon nitor. Marsh. 



Figures 26-29. — Upper incisor of Dipriodon robustv^, Marsh. 



Plate VIII. 



Figures 1-3. — Lower incisor of Selenacodon brevis. 



Figures 4-6. — Tooth of Platacodon nanus. Marsh. 



Figures 7-9. — Tooth of Platacodon nanus. 



Figures 10-12. — Tooth of Platacodon nanus. 



Figures 13-16. — Lower premolar of Oracodon anceps, Marsh. 



Figures 17-21. — Upper premolar of Allacodon lentus, Marsh. 



Figures 22-26. — Upper molar of Allacodon lentus. 



Figures 27-31. — Upper molar of Allacodon lentus. 



Figures 32-35. — Lower incisor of Halodon formosv^, Marsh. 



Figures 36-39. — Lower premolar of Halodon farmosus. 



Note. — The figures enlarged from natural size have the increase given iu 

 diameters over each cut. 



