BULLETIN OF THE BUREAU OF FISHERIES. 



Frond 1.5 to 4 cm. tall, forming muddy, dirty-looking tufts; branches spreading, usually short; 

 diameter of filaments 15 to 34 mic., lower cells 2 to 3 diameters long, median ones i to 1.5 diameters, 

 apical ones 3 to 4 diameters; sporangia of both kinds occurring on -^e same individual; "unilocular 

 sporangia" ovate, sessile; " plurilocular sporangia" elavate, broad, ootuse or truncated at the apex, 

 sessile, divided into numerous cells zonately arranged. 



West Indies; Guadeloupe. 



Fairly abundant, on marine grasses, Newport River, near Green Rock, Beaufort, N. C., August, 1906. 



tchella;, "plurilocular sporangia," 

 4, "plurilocular 



Fig. 7. Ectocarpus duchassaingianus, "plurilocular spo- Fig. 10. Ectocarp, 



"SK-^Z,*, sUiculosus. "plurilocular sporangium." ^Eium^T "' '"** ^ "* 

 X279- 



Fig. 9. Ectocarpus confervoides, "plurilocular sporangia," 

 X 279. A, Sessile; B, Shortly pedicellate. 



This species can be distinguished from the others occurring at Beaufort by its small size, muddy 

 appearance, tufted branches, and the shape of "plurilocular sporangia." 

 This is the northern limit reported for the species. 



3. Ectocarpus siliculosus (Dillwyn) Lyngbye. Fig. 8. 



Conferva siliculosa, Dillwyn, 1809, Supplement, p. 69, pi. R. 



Ectocarpus siliculosus, Lyngbye, 1819, p. 131, pi. 43 C (excluding var. and synonyms). 



Ectocarpus viridis, Harvey, 1852, p. 140, pi. 12 B, C. 



Ectocarpus confervoides var. siliculosus, Farlow, 1882, p. 71. 



Ectocarpus siliculosus, De Toni, 1895, p. 549. 



P. B.-A. Nos. 319, 1386, 2294. 



Fronds 3 to 30 cm. long, yellowish or from brownish to olivaceous, forming flaccid tufts, attached 

 or floating free; branching distinctly lateral or pseudodichotomous below; branches alternate or uni- 



