Trans. Am. Phil. Soe., N. S. XVIII, 1. 



PI 31 



83 



Reverse. 



10 



15 



20 



<3SM j^^^?M MtH>Mmg : 



wm m^SW^M^fmt^ 



^H^-'^m^tSH^ mmm^s gg 



FFf ! SB 'MM 



wm^w^t3irymMm4<>mk 



On the left margin of Reverse are traces of n\ | >~7[{ ~~^~.-' • -.- 

 On the lower margin of Reverse is M. 



