librarian U. S. Nat. Museum. 



70L. XVII. 





I V 



JUNE, 1904. 



Established by BENJAMIN SILLIMAN in 1818. 



THE 



AMERICAN 



JOURNAL OP SCIENCE. 



Editor: EDWARD S. DANA. 



ASSOCIATE, EDITORS 



Professors GEO. L. GOODALE, JOHN TROWBRIDGE, 

 W. G. FARLOW and WM. M. DAVIS, of Cambridge, 



Professors A. E. VERRILL, HENRY S. WILLIAMS and 

 L. V. PIRSSON, of New Haven, 



Professor GEORGE F. BARKER, of Philadelphia, 

 Professor JOSEPH S. AMES, of Baltimore, 

 - Mr. J. S. DILLER, of Washington. 



FOURT H SERIES. 

 VOL. XVII— [WHOLE NUMBER, CLXVIL] 



No. 102.— JUNE, 1904. 



WITH PLATES XXIII, XXIV. 



im 



*H 



NEW HAVEN, CONNECTICUT. 



1904 



JUN 2 



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Published monthly. Six dollars per year, in advance. $6.40 to countries in the 

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