MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES, VOL X. 



PLATE III. 



mg. 17 („> 



Kill. 18, 





Kit:. 18 (ft) 



W\g. 18 (o) 



Fitr. ' ■ 



Pig. in. 



Big. 18 (/) 



Kl(f. 20. 



Fife'. 20 («) 





Kilt. - 



Pig. 20 (d) 



Fig. 20 («) 



PHORONIS ARCHITECTA 



