164 



Balfsia verrucosa, Aresch. 



Frequent from Nahaiit, northward. 

 Balfsia clavata, Crouan. 



Swampscott; Maiden marshes, southern limit (Frank S. Collins). 



Eare. Common, northward (memo. Dr. Farlow). 



Chorda filum, Stack. 

 Common. 



Chordaria flagelliformis, Ag. 



Frequent. 

 Chordaria divarieata, Ag. 

 Swampscott (Eev. A. B. Hervey), Gloucester (Mrs. Bray), north 

 side of Cape Ann (Dr. Farlow), southward to New York. 



Castagnea vireseens, Thuret. (Mesogloia virescens, JETaj-u., iVer. 

 Am. Bor.) 

 Frequent at Gloucester, etc. 



Castagnea Zosterse, Thuret. (MeSogloia Zosterse, Harv., Mr. 

 Am. Bor.') 



Gloucester (Frank S. Collins, Mrs. Bray), Wood's Hole (Dr. Far- 

 low's list). 



Iieatliesia tuberiformis, Gray. 

 Frequent. 



Eiachista fucieola, Fr. 

 Frequent. 



Myrionema strangulans, Grev. 



Es.sex county waters (Rev. A. B. Hervey, Frank S. Collins). 

 Cladostephus spongiosus, Ag. 



Gloucester, etc. (Mrs. Bray). 

 Cladostephus vertieillatus, Ag. 



Occasional (Rev. A. B. Hervey, Mrs. Bray). 

 Sphacelarla radicans, Ag. 



Nahant (Dr. Farlow), Gloucester, etc. (Mrs. Bray, Rev. A. B. 



Hervey). 

 Sphacelaria cirrhosa, Ag. 



New York, northward (Dr. Farlow's list), Gloucester (Mrs. Bray). 



Ectocarpus sphserophorus, Carm. 

 "Nahant. I found a very small quantity of this last summer 

 (1879), and it is, I believe, all that has been found iu this country" 

 (Frank S. Collins, in letter Nov. 24, 1879). 



Eetocarpus brachiatus, Harv. 

 Boston, northward (Dr. Farlow's list), also reported in county 

 waters (Eev. A. B. Hervey), but Dr. Farlow now considers this as 

 doubtful. 



