AMERICAN 
JOURNAL OF SCLENCE. 
EDITORS 
JAMES D. ann EDWARD 8. DANA. 
ASSOCIATE EDITORS 
Prorressors ASA GRAY, JOSIAH P. COOKE, ann 
JOHN TROWBRIDGE, or CamsringE, 
Proressors H. A. NEWTON anp A. E. VERRILL, or 
New Haven, 
Prorrssorn GEORGE F. BARKER, or Patiapecrnta. 
THIRD SERIES, 
VOL. XXIX.—LWHOLE NUMBER, CXXIX.] 
Nos. 169—174. 
JANUARY TO JUNE, 1885. 
WITH FOUR PLATES. 
NEW HAVEN, CONN.: J. D. & E. 8. DANA. 
1885. 
