Reports on the results of dredging, under the supervision of Alexander Agassiz, in the Gulf of Mexico, by the United States Coast Survey steamer "Blake," Lieutenant-Commander C. D. Sigsbee, U. S. N., commanding. II. Report on the Echini, by Alexander Agassiz, Crinoids and Corals, by L. F. de Pourtalès, and Ophiurans, by Theodore Lyman. Preceded by a bibliographical notice of the publications relating to the deep-sea investigations carried on by the United States Coast Survey