/UaO. -Lf. VV CllUULL, 



U. S. Geol. Survey. . / 



Established by BENJAMIN SILLIMAN in 1818. 



T H E 



AMERICAN 



JOURNAL OF SCIEHOE. 



Editor: EDWARD S. DANA. 



ASSOCIATE EDITORS % 



Professors GEO. L. GOODALE, JOHN TROWBRIDGE, 

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



Professors O. C. MARSH, A. E. VERRILL and H. S. 

 WILLIAMS, of New Haven, 



Professor GEORGE F. BARKER, of Philadelphia, 

 Professor PL A. ROWLAND, of Baltimore, 

 Mr. J. S. DILLER, of Washington. 



FOURTH SERIES. 

 YOL, II— [WHOLE NUMBER, CLIL] 



No. 10.— OCTOBER, 1896. 



WITH PLATES IV-Y. 



NEW HA YEN, CONNECTICUT. 

 • 1896. 



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



Published monthly. Six dollars per year (postage prepaid). $6.40 to foreign sub- 

 scribers of countries in the Postal Union. Remittances should be made either by 

 money orders, registered letters, or bank checks. 



