Reports on the Scientific Results of the Expedition to the Tropical Pacific, in charge of Alexander Agassiz, on the U. S. Fish Commission Steamer "Albatross," from August, 1899, to March, 1900, Commander Jefferson F. Moser, U. S. N., commanding. Reports on the Scientific Results of the Expedition to the Eastern Tropical Pacific, in charge of Alexander Agassiz, on the U. S. Fish Commission Steamer "Albatross," from October, 1904, to April, 1905, Lieut. Commander L. M. Garrett, U. S. N., commanding. These publications are issued in numbers at irregular intervals. Each number of the Bulletin and of the Memoirs is sold separately. A price list of the publications of the Museum will be sent on application to the Director of the Museum of Comparative Zoology, Cambridge, Mass. Transcriber's Notes The text presented here is a transcription of the text that appeared in the original printed version. With the exception of some formatting differences and minor corrections (i.e., missing period or other punctuation), no significant typographical corrections were suggested. All questionable text was compared with several available copies and other volumes of the Bulletins and Memoirs that are currently available on the internet. With the exception of the paragraph on the second page preceeding the list of contributors and the Bulletins and Memoirs, all text displayed as small caps has been converted to all capital letters.