MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES, VOL. X. 



PLATE 



Kit'. II f« 



FIk. 15. 



Fig. 15 (6) 



Fill. 18. 



Fig. 15 («) 



Big, lit ,„,, in 



Fife'. 16 ( C ) 



Pig. 16 (6) 



Fig 1 . 17. 



PHORONIS ARCHITECTA 



"om.ss.JJri. 



