158 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 3 



PLATE 19 



Fig. 9. Rliodymcnia Ho-zctuuia, median section through a ma- 

 ture cystocarp. x ISO 



Fig. 10. R. attenuata, portion of a frond bearing cystocarps. x 5 



Fig. 11. R. attenuata, median section through a mature cysto- 

 carp. X 60 



Figs. 12-13. /?. /oZ'rt/rt, cross sections of (1.2) a sterile and (13) a tet- 

 rasporic frond, x 150 



