234 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 3 



This plant is here reported for the first time from our coasts. It is evi- 

 dently an inhabitant of the warm waters of shallow bays and lagoons in 

 many parts of the world. 



Growing in middle littoral, in quiet water of shallow, silty bays and 

 lagoons, on substrata of loose gravel or coarse sand and broken shell : D. 

 306, Willard's Island, Jan.; D. 385, Tepoca Bay, Feb.; D. 424, Pond 

 Island, Feb. ; D. 606, San Gabriel Bay, Espiritu Santo Island, Feb. 



Genus HYDROGLATHRUS Bory 

 Hydroclathrus clathratus (Bory) Howe 



Howe, 1920, p. 590; Setch. & Gard., 1924, p. 727. Hydroclathrus can- 

 cellatus Harvey, 1859, tab. 98. 



Thus far, specimens of this tropical species have been found only in 

 the warm waters of the southern part of the Gulf. When found they are 

 only occasional. 



Brand. 11, cast ashore at La Paz; M. 12, Eureka; D. 598d, growing 

 in coral heads on bottom of shallow lagoon, San Gabriel Bay, Espiritu 

 Santo Island, Feb.; D. 608, among other algae on rock shingle, same 

 locality. 



Family Ghnoosporaceae 



Genus GHNOOSPORA J. Ag. 



Chnoospora pacifica J. Ag. 



J. Agardh, 1847, p. 7; Kutzing, Tab. Phyc. IX, tab. 86; Setch. & Gard., 

 1924, p. 728. 



M. 16, Eureka; Brand. 39, cast ashore at La Paz. 



This species has not again been encountered, and its absence from all 

 the recent collections as well as from those of Johnston suggests that it 

 may be of strictly tropical distribution and limited to the warm waters of 

 the southern extremity of the Gulf. The type was collected by Liebmann 

 at St. Augustine, near Acapulco much farther south on the coast of 

 Mexico. 



Family Ishigeaceae 



Genus ISHIGE Yendo 



Ishige foliacea Okam. 

 Plate 53, Fig. 2 



Okamura, in Segawa, 1935, pp. 65, 66; Okamura, 1936, p. 239, figs. 130, 

 131 ; Yendo, 1907, p. 155, pi. II, figs. 1-8. 



