PLATE I 



SKULL AXD LOWER JAW OF Isolobodon portoticensis gen. et sp. nov. 



Figs. 1 and 2. — Left mandibular ramus, outer and inner views. (Natural size.) 

 Figs. 3-5. — Three views of the type skull. (Natural size.) 

 Figs. 6-8. — Three views of a paratype skull, rather older and larger than the 

 type skull. (Natural size.) 



