3^ 



„ /f 



^VM. 



THE 



AMBRICAN 



JOURNAL OF SCIENCE. 



Editor: EDWARD S. DANA. 



ASSOCIATE EDITORS 



Professors GEO. L. GOODALE, JOHN TROWBRIDGE 

 H. P. BOWDITCH AND W. G. FARLOW, of Cambridge 



5 



Professors O. C. MARSH, A. E. VERRILL 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. II— [WHOLE NUMBER, CLIL] 



Nos. 7-12. 



JULY TO DECEMBEE, 1896. 



WITH SIX PLATES. 



NEW HAYEN, CONNECTICUT. 



1896. 



