OP ARTS AND SCIENCES. 861 



Furthermore, the variety ai-ietlna, considered by Bailey a good species, 

 differs more from the typical form of P. Harveyi than does P. Olneyi ; 

 aud, if we are to regard P. Ohieyi as a species, we must also separate 

 P. arietlna, as well as several other varieties, — a divi-ion by all 

 means to be avoided. The description of P. subcontorta, Peck, answers 

 perfectly to P. Harmyi. 



119. PoLYSiPHONiA HIRTA, Ag. (P. ramentacea, Harv.) Key 

 West. 



120. PoLYSiPHONiA ELONGATA, Grev. Lynn, Mass.; Vineyard 

 aud Long Island Sounds. Common. 



121. POLYSIPHONIA viOLACEA, Grev. New York northward. 



122. PoLirsiPHONiA FiBRiLLOSA, Grev. Noank, Conn.; Orient 

 Point, L.I. 



*123. POLYSIPHONIA PENNATA, Ag. ou Gelidium cartilagineum. 

 San Diego, Cal., Mr. D. Cleveland ; Southern Europe. 



124. POLYSIPHONIA PARASITICA, Grev. Rhode Island. 

 *125. POLYSIPHONIA DENDROiDEA, Mont. Considered by Agardh 

 a variety of the above, is common in California. Originally from 

 Peru and west coast of South America. The Californian specimens 

 are very luxuriant, aud I had formerly erroneously supposed them to 

 be the liytiphlcea ? Baileyi of Harvey. 



12G. POLYSIPHONIA. Baileyi, Ag. {Rytiphloea'^ Harv.) Pacific 

 coast. To the naked eye not very unlike some states of Rhodoinela 

 Jloccosa. 



127. POLYSIPHONIA Pecten Veneris, Harv. Florida. 



128. POLYSIPHONIA EXiLis, Harv. Key West. 



129. POLYSIPHONIA ATRORUBESCKNS, Grev. New York to Cape 

 Cod. 



130. POLYSIPHONIA BiPiNNATA, Post, and Rupr. "West coast. — 

 Under this name, Agardh, in his Spec. Alg. p. 1010, includes P. Gali- 

 fornica, Harv., and Polyostea gemmifera, Rupr. Alg. Ochot. Harvey 

 was not of the opinion that P. CaUfornica and P. gemmifera should be 

 united, inasmuch as he distributed specimens of both species in the algaj 

 of the North Pacific Expl. Exp. under Capt. John Rodgers. Under 

 P. CaUfornica, Harvey includes, however, two sets of specimens, — 

 those originally from California, to which he gave the manuscript name 

 of P. plumigera, and those collected by the Rodgers Expedition. The 

 former are much coarser than the latter, and do not adhere well to paper. 

 A cross-section of the larger branches sliows distinctly fourteen periph- 

 eral cells, agreeing with the figure of P. gemmifera, Rupr. Alg. Ochot. 

 Plate 11, ag. The specimens collected by Mr. E. Hall in Oregon, 



