SMITHSONIAN CONTRIBUTIONS TO KNOWLEDGE. 



NEREIS 



BOREALI-AMERICANA : 



CONTRIBUTIONS TO THE HISTORY OF THE MARINE ALG^E 

 OF NORTH AMERICA. 



WILLIAM HENRY HARVEY, M.D., M.R.I.A., F.L.S., 



30PES.S0K OK BOTANT I^ THE irNIVIvRSITY OF DUBLIN; HOKOKART MEMHriK OF THE LYCEUM OF KATtfiAL HISTORY, KEW YORK. J.TC, ETC. 



PART III. — CHLOROSPERMEiE 



[ACCEPTED FOR PUBLICATION, SEPTEMBER, 1857.] 



