PLATE 273. 





C3 

 C 



C 

 nl 

 X! 



U 



u 

 bo 

 u 



I 



V 



c 

 o 



- I 



3 



o 



< 



X 

 w 



2 



» 

 X 

 h 

 D 



o 



M 



w 



ui a 



