PROCEEDINQS WASHNGTON ACADEMY OF SCIENCES Vol. II, pp. 133-156. August 20, 1900. RESULTS OF THE BRANNER-AGASSIZ EXPEDI-TION TO BRAZIL. I. THE DECAPOD AND STOMATOPOD CRUSTACEA. By Mary J. Rathbun. During the summer of 1899, Dr. J. C. Branner visited Brazil for the purpose of studying the stone and coral reefs of the coast between Cape St. Roque and Rio de Janeiro. The ex-penses of the trip were borne chiefly by Professor Alexander Agassiz, of Harvard University. Mr. Arthur W. Greeley, of the San Diego State Normal School, California, accompanied the expedition as naturalist, and the biological collections were made chiefly by him, with such assistance as other members of the party could give from time to time. The collecting was all done between June 3 and August 8, 1899, between Natal, in the State of Rio Grande do Norte, and Maceio, State of Ala-goas. The decapod and stomatopod crustaceans collected number seventy species. Six of these were undescribed, and the known ranges of many other species have been extended. The types of new species are in the U. S. National Museum. Proc. Wash. Acad. Sci. August, 1900. (^33)