158 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 26 



PLATE 26 



Fig. 1-3. Ceramium taylorii Daws. Fig. 1, Tip of a tetrasporangial axis, X 

 150; Fig. 2, Series of cortical bands about 1 mm. from a sterile tip, 

 X 250; Fig. 3, A cortical band in lower part of an axis showing ex- 

 tended internodes, X 250. 



Fig. 4-6. Ceramium zacae S. & G. Fig. 4, Upper part of a tetrasporangial axis, 

 X 150; Fig. 5, Young cortical bands, X 225; Fig. 6, Older cortical 

 bands, X 350. 



Fig. 7. Centroceras clavulatum (Ag.) Mont. Detail of cortex showing cell 

 arrangement and whorled spines, X 325 (After Smith). 



