167 
Cladophora gracilis, Grif. 
Nahant (Frank S. Collins, Dr. Farlow’s list), to ) A 
Cladophora letevirens, Dillw. 
Boston Bay (Dr. Farlow’s list), Nahant (Frank S. Collins), also at 
New York. 
Cladophora fracta, Fl. Dan. 
Nahant (Frank S. Collins), also noticed by Rev. A. B. Hervey. 
Common. 
Cladophora expansa, [iitz. 
‘‘Not uncommon at Nahant and Marblehead” (Frank S. Collins, in 
letter Nov. 24, 1879). 
Cheetomorpha Piquotiana, Mont. 
Frequent (Rev. A. B. Hervey, Frank S. Collins). 
Chetomorpha melagonium, Web. & Mohr. 
Frequent. 
Cheetomorpha crea, Dillw. 
East coast (Dr. Farlow’s list), Gloucester (memo. Dr. Farlow). 
Cheetomorpha sutoria, Berk. 
Marblehead (Frank S. Collins), also noticed at Magnolia, Mass., by 
Mrs. Bray. More abundant southward. 
Cheetomorpha tortuosa, Diliw. 
Nahant, northward. Common. 
Hormotrichum Younganun, Dillw. 
Gloucester (Mrs. H. A. Cochrane, in herb. P. A. S.), Nahant 
(Frank S. Collins). Frequent. : 
Hormotrichum speciosum, Carm. 
Swampscott (Frank S. Collins). 
Hormotrichum collabens, Kiitz. 
‘‘Nahant. This last is an extremely rare species, having been 
found only once in Great Britain, once in France, and a very few 
times in the German ocean. I have seenit only once. Both the 
Hormotrichum (the last and this species) were identified by Dr. 
E. Bornet of Paris, from my specimens” (Frank S. Collins, in letter 
Nov. 24, 1879). 
Hormotrichum Carmichaelii, Harv. 
Swampscott (Frank S. Collins). 
CYANOPHY CHA. 
Lyngbya ferruginea, Ag. 
(Rev. A. B. Hervey, Mrs. Bray). Very common (memo. Dr. Far- 
low). 
Calothrix confervicola, Ag. 
Common. 
