167 



Cladophora gracilis, Grif. 



Naliant (Frank S. Collins, Dr. Farlow'slisf), to N. J. 

 Cladophora laetevirens, 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, Kutz. 



"Not uncommon at Nahant and Marblehead" (Frank S. Collins, in 



letter Nov. 24, 1879). 



ChEBtomorpha Ifiquotiana, Mont. 



Frequent (Rev. A. B. Hervey, Frank S. Collins). 

 Chaetomorpha melagonium, Web. &_Mohr. 



Frequent. 

 Chsetomorpha serea, Dillw. 



East coast (Dr. Farlow's list), Gloucester (memo. Dr. Fai'Iow). 

 Chaetomorpha sutoria, Berk. 



Marblehead (Frank S. Collins), also noticed at Magnolia, Mass., by 



Mrs. Bray. More abundant southward. 

 Chaetomorpha tortuosa, Dillw. 



Nahant, northward. Common. 



Hormotriohum. Younganum, Dilho. 



Gloucester (Mrs. H. A. Cochrane, in herb. P. A. S.), Nahant 



(Frank S. Collins). Frequent. 

 Hormotriohum speciosum, Carm. 



Swampscott (Frank S. Collins). 

 Hormotriohum coUabens, 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 seen it only once. Both the 



Hormotrichum (the last and this species) were identified by Dr. 



B. Bornet of Paris, from my specimens" (Frank S. Collins, in letter 



Nov. 24, 1879). 

 Hormotriohum Carmichaelii, Sam. 



Swampscott (Frank S. Collins). 



C Yj^N-OPH YCE^ . 



Lyngbya ferrugiuea, Ag. 



(Rev. A. B. Hervey, Mrs. Bray). Very common (memo. Dr. Far- 

 low). 



Calothrix confervicola, Ag. 

 Common. 



