MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES, VOL X. 



PLATE V. 



Fig. 20. 



n.),. 



Fig. 28. 



Fig. 28 {d) 



p.o.l. 



Hi. 



Fig. 29 16) 



l.i: 



Fig. 28 (e 



t.r. 



Fig. 80. 



Fig. 81. 



PHORONIS ARCHITECTA 



:rs.Djx 



