PLATE II 



LOWER JAW AND DENTITION OF Isolobodon portoricensis gen. et sp. nov. 



JFiGS. 1-4. — Right mandibular ramus of a young adult. (Natural size.) 



Fig. 5. — Lower toothrow, left ramus. From same specimen as PI. I, Figs. 1 

 and 2. (Twice natural size.) 



J'iG. 6. — Lower toothrow, right ramus, of a young adult. From same specimen 

 as Figs. 1-4. (Twice natural size.) 



F'iG. 7. — Right maxillary toothrow. (Twice natural size.) 



Figs. 8 and 9. — Upper and lower views of the left mandibular ramus shown in 

 PI. I, Figs. 1 and 2. (Natural size.) 



Fig. 10. — Upper and lower dentition of Plagiodontia cedum F. Cuvier, for com- 

 parison with that of Isolobodon. After F. Cuvier, Ann. 

 des Sci. nat., ser. 2, Vol. VI, 1836, pi. xvii, figs. 4 and 5. 

 (Natural size.) 



