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



PLATE Xn. 



J^ 



A' 



Vuj. 44. 



Fig. 40. 



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K 



^ I 



\\ 



Fig. 4S. 



Fig. 4S. 



Fig. 49. 



Fig. 60. 



L. E. GRIFFIN, DEL. 



