3 P 



2 



J 



THE 



AMERICAN 



JOURNAL OF SCIENCE. 



EDITORS 



JAMES D. and EDWARD S. DANA. 



ASSOCIATE EDITORS 



Professors GEORGE L. GOOD ALE and JOHN 

 TROWBRIDGE, of Cambridge. 



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

 H. S. WILLIAMS, of New Haven, 



Professor GEORGE F. BARKER, of Philadelphia. 



/ 



THIRD SERIES. 

 VOL. XLVIII— [WHOLE NUMBER, CXLVIIL] 

 Nos. 283—288. 

 JULY TO DECEMBER 1894. y^^* "* U \ 



"WITH 21 PLATES. 



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

 1894. 



