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several cases of specimens belonging to many groups. The other principal accessions have been a fine series of the seaurchins and starfishes of the West Coast of Mexico, from Mr. A. Farrer; numerous specimens of Pacific corals and Echinoderms from Prof. R. E. C. Stearns; and the collection of Marine invertebrates made by Lieut. Geo. M. Stoney, U.S.N., in Alaska, in 1884.

Much progress has been made in the determination and cataloging of specimens. Prof. Walter Faxon has completed his studies of the collection of crayfishes, which is now the second in size and number of species in the United States, being exceeded only on or that at the Museum of Comparative Zoology, Cambridge. It contains 46 North American species. The collection of Echini, which holds the same relative rank, has also been