MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES, VOL. VIII, 5TH MEM. 



PLATE IX. 



Ha 



V R 



EL 



mi 



u 



Ft. 



RS 



iL 



S 

 Fig. So. 



I J LJ 



Oe. M 



Fig SS. 



BM 



MM 



Fig. 34. 



Fig. 32. 



L. E. GRIFFIN, DEL. 



