﻿3 P 



/ 



&»s 



THE 



AMERICAN" 



JOURNAL OF SCIENCE 



EDITORS 



JAMES D. and EDWARD S. DANA. 



ASSOCIATE EDITORS 



Professors ASA GRAY, JOSTAH P. COOKE, and 

 JOHN TROWBRIDGE, of Cambridge, 



Professors H. A. NEWTON and A. E. VERRILL, of 

 New Haven, 



Professor GEORGE F. BARKER, of Philadelphia. 



THIRD SERIES. 



VOL. XXXII. -[WHOLE NUMBER, 0XXX1IJ 

 Nos. 187—192. 



JULY TO DECEMBER, 1886. 



WITH THIRTEEN PLATES. 



NEW HAVEN, CONN. : J. D. & E. S. DANA. 

 1886. 



