VOL. XXX7III. NOVEMBER, 1914. 



Established by BENJAMIN SIIXIMAN in 1818. 



THE 



AMEBIC AN^jonatJ 



JOURNAL OF SCIENCE 



Editor: EDWAKD S. DANA. 



ASSOCIATE EDITORS 



Professors GEORGE L. GOODALE, JOHN TROWBRIDGE, 

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



Professors ADDISON E. VERRILL, HORACE L. WELLS, 



LOUIS V. PIRSSON, HERBERT E. GREGORY 



and HORACE S. UHLER, of New Haven, 



Professor HENRY S. WILLIAMS, of Ithaca, 



Professor JOSEPH S. AMES, of Baltimore, 



Mr. J. S. DILLER, of Washington. 



FOURTH SERIES 



VOL. XXXVIII— [WHOLE NUMBER, CLXXXVIIIJ. 

 No. 227— NOVEMBER, 1914. 



WITH PLATE III. 



NEW HAVEN, CONNECTICUT. 



1914. 



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