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[[Letterhead]] UNITED STATES NATIONAL MUSEUM UNDER DIRECTION OF THE SMITHSONIAN INSTITUTION WASHINGTON [[/Letterhead]] of the latter collection was [[?]] in April. The osteological preparator and his assistant were constantly engaged in cleaning skeletons and mounting them for exhibition. One of the most interesting of the recently exhibited skeletons is that of [[underlined]] Rhytina gigas [[/underlined]], obtained by Dr. L. Stejneger for the Institution in Bering Island. Some progress has been made in the preparation of a series of specimens illustrative of the modifications of the limbs and other portions of the skeleton in the different classes of vertebrates. Experiments in [[strikethrough]] [[?]] [[/strikethrough]] special cases for the exhibition of this and other similar series have proved very successful. But little work has been done in