|has. D. Walcott, 



U. S. Geol. Survey. 



VOL. XLVIIL 



DECEMBER, 1894. 



Established by BENJAMIN SILLIMAN in 1818. 



THE 



AMERICAN 



JOURNAL OF SCIENCE 



EDITORS 



JAMES D. and EDWARD S. DANA. 



ASSOCIATE EDITORS 



Professors GEORGE L. GOODALE ato JOHN 

 TROWBRIDGE, oe Cambridge. 



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

 H. S. WILLIAMS, of New Haven, 



Professor GEORGE F. BARKER, of Philadelphia. 



THIRD SERIES. 



YOL. XLVIII— [WHOLE NUMBER, CXLYIIL] 

 No. 288.— DECEMBER, 1894. 



"■VITH PLATE SI. 



NEW HA YEN, CONN.: J. D, & E. S. DANA. 

 1894. 



TUTTLE, MOREHOUSE & TATLOR, PRINTERS, 125 TEMPLE STREET. 



Published monthly. Six dollars per year (postage prepaid). $6,40 to foreign sub- 

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