360 PROCEEDINGS OF THE AMERICAN ACADEMY 



103. Chondria nidifica, Harv. Pacific coast. 



104. Rhodomkla Lauix, Ag. Oregon, M. E. Hall. 



105. Rhodomela floccosa, Ag. (iuc. R. plluUfera, Grev.) 

 Oregon. 



106. Rhodomela sdbfusca, Ag. New York nortliward. 



Var. GRACILIS {R. gracilis, Ner. Am.-Bor.) more common north of 

 Cape Cod. 



Var. RocHEii {^R. Rochei, Ner. Am.-Bor.), spring, more common in 

 Long Island Sound. 



107. DiGENiA SIMPLEX, Ag. Key West. 



108. PoLYSiPHONiA URCEOLATA, Grev. New York northward; 

 California. 



Var. FORMOSA. Same limits. 



109. PoLYSiPHONiA Havanensis, Mont. Agardh includes under 

 this species P. Binneyi, Harv. Florida. 



110. PoLYSiPHONiA ferulacea, Ag. (inc. P. breviarticulata, 

 Harv.) Key West. 



111. PoLTSiPHONiA subtilissima, Mont. Jackson's Ferry, West 

 Point, N.Y. ; Providence, R. I. ; Newburyport, Mass. 



112. POLYSIPHONIA SECUNDA, Ag. Key West. 



113. POLYSIPHONIA FRACTA, Harv. Key West. 



114. POLYSIPHONIA ECiiiNATA, Harv. Key West. 



115. POLYSIPHONIA HAPALACANTHA, Harv. Key West. 



116. POLYSIPHONIA GoRGONi^, Harv. Key West. 



117. PoLYSiPHONiA Olneyi, Harv. New York northward. 



118. POLYSIPHONIA Harveyi, Bail. New York northward. 

 Var. ARIETINA. Nahant, Mass., W. G. F. — Northern limit '^ It is 



probable that Nos. 117 and 118 should be united with P. spinulosa, 

 Grev., found in the north of Scotland, and on the shores of the Adriatic 

 and Mediterranean. The only opportunity I have had for examining 

 the last-named plant living was at Antibes, France. There can have 

 been no mistake in the species, as it was determined by M. Thuret, 

 the highest authority. I must confess that I could see no difference 

 between P. spinulosa and our own P. Harvvyi. It is to be regretted 

 that P. spinulosa is not more common, so as to afford more ample 

 means for comparison. As to the two forms, P. Olneyi and P. Har- 

 veyi, I feel obliged to regard them as varieties of one species, since, 

 although I have had excellent chances for observing both forms grow- 

 ing, I have found so manv intermediate states that I am quite unable 

 to draw the line. My friend, Prof. D. C. Eaton, with excellent oppor- 

 tunities for observing both forms, has had a similar experience. 



