20 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



The range of forms examined by the writer with these 

 points in mind exhibits, it is true, the structural differences 

 pointed out by Agardh. But further, it should be observed 

 that the species here in question, as field studies show, is 

 apparently a form occurring between December and August, 

 reaching its finest development in February and March, and 

 at that time exhibiting the characters of N. macroglossmn. 

 The forms collected from April to August show the charac- 

 ters of N. latissitnum, with frequent occurrence of transi- 

 tion forms between the two species. 



The evidence collected by the writer in field and herba- 

 rium points to the conclusion that IV. maa'oglossinn and N. 

 latissimnm are seasonal variations of the same species, that 

 is, N. latissiinum. 



Habitat. — On piles of docks and wharves, or on sloping 

 rock surfaces where the wave action is not violent; lower 

 littoral to sublittoral zone. 



Distribution. — At various points along the coast from 

 San Pedro to Vancouver. 



Localities. — San Pedro! (Mrs. S. P. Monks); Santa 

 Barbara! (Dr. and Mrs. L. M. Dimmick; Mrs. S. P. 

 Cooper) ; shores of San Luis Obispo County! (Mrs. R. W, 

 Summers); Pacific Grove! (M. A. Howe; Mrs. J. M. 

 Weeks; C. P. Nott) ; Santa Cruz! (Dr. C. L. Anderson; 

 Mrs. J. M. Weeks); San Francisco! (G. W. Lichten- 

 thaler) ; San Francisco Bay entrance (Golden Gate) at 

 Fort Point! (M. A. Howe; W. A. Setchell; W. J. V. 

 Osterhout; C. P. Nott) ; at Lime Point! (C. P. Nott) ; Fort 

 Ross! (W. A. Setchell); Klatsop, Oregon, (L. F. Hen- 

 derson, in Herb.; W. G. Farlow, ^(^e W. A. Setchell); 

 Port Orchard, Washington! (J. E. Tilden) ; Esquimault 

 Bay, Vancouver Island, B. C. (Harvey, in Proc. Linn. 

 Soc, (Botany) Vol. VI, 1862, p. 170; Farlow, Proc. 

 Amer. Acad. Arts and Sci., Vol. X, 1875, p. 365); Puget 

 Sound! (N. L. Gardner). 



