OF ARTS AND SCIENCES. 371 



there is, and probably always will be, some doubt, as Harvey's speci- 

 mens were very poor, and, at the best, species of Chondrus are very 

 variable. .Furthermore, wheu we consider that sterile specimens of 

 Gigartina, Chondrus, and Iridcea, cannot be generically distinguished 

 from one another by any definite character, and when we remember 

 that species have been described in all these genera from sterile speci- 

 mens, the prospect is almost hopeless. The variability of Chondrus 

 crispns of our eastern coast is well known, and there is no reason why 

 any other Chondrus should not vary to the same extent. The ques- 

 tion for the California botanists to answer is. Is there more than one 

 species of Chondrus on the west coast? If there is but one, it will 

 probably be found that C. affinis, Harv., is nothing but a form of 

 C. canaliculcdus, Ag., which is common on the west coast of South 

 America, and very variable. 



270. Endocladia muricata, Ag. San Diego, Cal., northward. 



271. Gloiopeltis fducata, Ag. Oregon, Mr. E. Hall. 



272. Cryptonejiia crenulata, Ag. Key West. 



*273. Cryptonejiia luxdrians, Ag. Key West, Dr. E. Palmer : 

 West Indies, Brazil, Ceylon. 



274. CiiYLOCLADiA ? Baileyana, Harv. Long Island Sound and 

 southward. Said by Zanardini in Phyc. Alg. Adriat, vol. ii. pi. 43, 

 to be the same as C. uncinata, Menegh. I have found our plant in 

 fruit, however, and it is not a Chylocladia in the proper sense. 



275. Chylocladia rosea, Harv. Newport, R.I., Mr. S. T. Olney ; 

 dredged in ten fathoms off Gay Head, W. G. F. ; Portsmouth, N.H., 

 Dr. Durkee. 



276. Chrysymenia exterojiorpha, Harv. Key West. 



277. Chrysymenia halymenioides, Harv. Key West. 



278. CiiRYSYMExrA Agardiiii, Harv. Key West. 



279. Chrysymenia ramosissima, Harv. [Bhabdonia ramosissima, 

 Ag., Bidrag, p. 38.) Key West. 



280. Chrysymenia? acanthoclada, Harv. Key West. 



281. Chrysymenia uvaria, Ag. Key West. 



282. Halymenia i.igdlata, Ag. Key West. 



283. Halymenia Floresia, Ag. Key West. 



284. Halosaccion hydrophora, Ag. Oregon, Mr. E. Hall. 



285. Halosaccion fucicola, Post, and Rupr. Calif )rnia. 



286. Halosaccion rameniaceum, Ag. Rye Beach, N.H,, north- 

 ward. — Southern limit ? 



287. Furcellaria fastigiata, Lyngh. Said to have been found 

 on the New England coast. 



