266 THE AMERICAN NATURALIST. [Vor. XXXV. 
EXPLANATION OF PLATE II. 
Illustrating the In of the lower molar teeth in marsupials. (Same 
references as in Pla 
Abbreviations. 
Prt, — pa E^. — entoconid. 
Pa?, — paraconid. y^. — hypoconid 
Met, — debe H1?. — hypoconulid. 
a.s. — antero-external shelf, 
