SMITHSONIAN CONTRIBUTIONS TO KNOWLEDGE. 



NEREIS 



BOREALI-AMERICANA : 



OB, 



CONTRIBUTIONS TO THE HISTORY OF THE MARINE ALG^ 

 OF NORTH AMERICA. 



WILLIAM HENRY HARVEY, M.D., M.R.I.A., RL.S., 



l-ROr«SSOR OF BOTASI IH THE UNIVEKSITY OF DUBLIN; HONORART HKMBER OF THF. LICEUM OF NATURAL BISTORT, SEW YORK, ETC., ETC. 



PART III.— CHLOROSPERMEiE, 



[ACCEPTED FOR PUBLICATION, SEPTEMBER, 1857.] 



