BROWN AND RED ALGiE 



149 



y 



I 



- &-. 



Fig. 66. — Sargassum. 

 a. Air vesicles ; b, cylindrical conceptacula 



c, leaf. 



Fig. 68. — Himanthalia. 

 (After Murray.) 



Fig 6 7 —Durvill^ea. (After Lem- Fig. 69.— a, Hormosira 



MERMANN.) b, NOTHEIA. 



