90 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 12 



downward, lower segments commonly to 2-3 cm long, narrow below and 

 to 15 mm wide at the top, where they branch so closely as to appear sub- 

 palmate, the upper segments 2-3 mm broad, rounded truncate. 



This densely growing little Dictyota has somewhat the aspect of D. 

 Bartayresiana of the Caribbean, but branches more irregularly. As the 

 individuals are sterile, it is probable that fuller growth would modify its 

 appearance somewhat. 



Mexico: Baja California, intertidal on Point Hughes, Cabo San 

 Lazaro, no. 34-598 (TYPE), 7 Mar. 1934. 



Dictyota divaricata Lamouroux, prox. 



Taylor 1928, p. 120, pi. 16, f^gs. 6-9. 



These fragmentary specimens leave much to be desired for records of 

 this species, but have in common wide-angled branching and considerable 

 change from wide segments below to narrow ones above. 



Mexico: Is. Revilla Gigedo, dredged at sta. 129 in 25-32 meters at 

 Braithwaite Bay, I. Soccoro, no. 34-15, 3 Jan. 1934. Ibid., rare as 

 dredged at sta. 135 from 45 meters, no. 34-45, 5 Jan. 1934. Ibid., 

 dredged at sta. 922 from 18-37 meters, no. 39-69, 18 Mar. 1939. Ba. 

 Tenacatita, dredged from 18 meters' depth, Schmitt no. 486A-35, 15 

 Feb. 1935. Ecuador: dredged from 18 meters off I. LaPlata, no. 34- 

 478, 10 Feb. 1934. 



Dictyota crenulata J. Agardh 

 Plate 10, Fig. 1 



Setchell & Gardner 1924, p. 730, pi. 18, figs. 50, 51 ; 1925, p. 655; 

 Dawson 1944, p. 228. 



The figures of Setchell & Gardner are of little assistance in recogniz- 

 ing this plant. The writer was able to confirm the identification by com- 

 parison with authentic material in the Agardhian Herbarium, at Lund. 



Mexico: Is. Revivlla Gigedo, infrequent in lower tide pools and the 

 surf, Braithwaite Bay, I. Soccoro, nos. 34-5, 34-25, 2, 3 Jan. 1934. 

 Costa Rica: among the driftweed, Pto. Culebra, no. 34-530, 24 Feb. 

 1934. 



GLOSSOPHORA J. Agardh, 1880 



Plant erect, bushy, dichotomously branched, the branches strap 

 shaped ; growth from a single apical cell, developing a distinct medulla 

 and more than one cortical layer ; lower segments densely beset with small 

 ligulate appendages. 



