r f 



THE 



AMERICAN 



JOURNAL OF SCIENCE. 



Editor: EDWARD S. DANA. 



ASSOCIATE EDITORS 



Professors GEO. L. GOODALE, JOHN TROWBRIDGE, 

 H. P. BOWDITCH and W. G. FARLOW, op Cambridge, 



Professors H. A. NEWTON, O. C. MARSH, A. E. YERRILL 

 and H. S. WILLIAMS, of New Haven, 



Professor GEORGE F. BARKER, of Philadelphia, 

 Professor H. A. ROWLAND, of Baltimore, 

 Mr. J. S. DILLER, of Washington. 



FOURTH SERIES. 

 YOL. I— [WHOLE NUMBER, CLL] 

 Nos. 1—6. 

 JANUAET TO JULY, 1896, 



WITH THIRTEEN PLATES. 



NEW HAYEN, CONNECTICUT. 

 1896. 



