SMITHSONIAN CONTRIBUTIONS TO KNOWLEDGE. 
NEREIS 
BO RE A LI- AMERICAN A : 
OR, . 
CONTRIBUTIONS TO THE HISTORY OF THE MARINE A.JL G M 
OF NORTH AMERICA. 
BY 
WILLIAM HENRY HARVEY, M.D., M.R.I.A., F.L.S., 
PROFESSOR OP BOTANY IN' THE UNIVERSITY OF DUBLIN; HONORARY MEMBER OP THE LYCEUM OP NATURAL HISTORY, NETT YORK. ETC, ETC. 
PART III, — CHLOROSPERME2E. 
[ACCEPTED FOR PUBLICATION, SEPTEMBER, 1857.] 
