262 O. C. Marsh — Discovery of Cretaceous Mammalia. 



Plate VII. 



Figure 1 . — Incisor of Cimolomys gracilis. 

 Figure 2. — Incisor of Cimolomys bellus, Marsh. 

 Figure 3 

 Figure 4 

 Figure 5 

 Figure 6 

 Figure 7 

 Figure 8 



Upper jaw of Allacodon pumilus. Marsh, with three premolars in place- 

 — Upper premolar of Allacodon fortis, Marsh. 

 — Upper molar of Allacodon ranis, Marsh. 

 — Upper premolar of Oracodon anceps, Marsh. 

 — Upper cutting premolar of same species. 

 — Upper premolar of Oracodon conulus, Marsh. 



Plate Till. 



Figure 1. — Premolar of Stagodon nitor, Marsh. (Type.) 



Figure 2. — Premolar of same species, with roots more distinct. 



Figure 3. — Upper premolar of Stagodon tumidus, Marsh. (Type.) 



Figure 4. — Premolar of Stagodon validus, Marsh. 



Figure 5. — Premolar of same species. 



Figure 6. — Left lower canine of same. 



Figure 7. — Right lower jaw of Stagodon validus, showing canine and two 

 premolars in place. 



Plate IX. 



Figure 1. — Two right upper molars of Didelphops vorax, Marsh, in position in jaw. 



Figure 2 — Upper premolar of Telacodon laivis, Marsh, in jaw. 



Figure 3. — Lower jaw of Telacodon Icevis, with three premolars in place, and 



alveoles for two others. 



Figure 4. — Lower jaw of Telacodon prozsta?is, Marsh. 



Figure 5. — Left lower jaw of Cimolestes incisus, Marsh ; outside view. 



Figure 6. — The same jaw ; inside view. 



Figure 7. — -Eight lower jaw of Didelphops ferox, Marsh; seen from above. 



Figure 8. — The same jaw; seen from the inside. Both figures natural size. 



Plate X. 



Figure 1. — Upper molar of Didelphops comptus, Marsh. 



Figure 2. — Upper premolar of same species. 



Figure 3. — Upper molar of Pediomys elegans, Marsh. 



Figure 4. — Premolar of same species. 



Figure 5. — Lower molar of Cimolestes incisus. 



Figure 6. — Lower jaw of Batodon tenuis, Marsh, with last two molars in place. 



Figure 7. — Left lower jaw of Pediomys elegans, with last molar in place. 



Plate XL 



Figure 1. — Upper molar of Telacodon lazvis. 



Figure 2. — Upper molar of Batodon tenuis. 



Figure 3. — Lower molar of same species. 



Figure 4. — Canine tooth of Cimolestes. 



Figure 5. — Lower jaw of Batodon tenuis, with premolars and canine in place. 



Figure 6. — Tooth of Platacodon nanus, Marsh. 



Figure 7. — Lower incisor of same species. 



Figure 8. — Lower molar of Telacodon pr&stans. 



Figure 9. — Milk-tooth of Didelphops. 



