is. D. Walcott, 



U. S. Geological Survrv 



>L. XXXIX. 



JANUARY, L890. 



Established by BENJAMIN SILLIMAN in 1818. 



THE CJ). WALCOTT. 



AMERICAN 



JOURNAL OF SCIENCE. 



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THIRD SERIES. 



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VOL. XXXIX.— [WHOLE NUMBER, CXXXIX. J 



No. 229.— January; i89o. 



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



1890. 



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