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16. Michigan, who supplemented it by other forms from Mauritius and the Hawaiian Islands. [[paragraph symbol]] Another gift which is highly appreciated was [[strikethrough]] that of [[/strikethrough]] a set of several hundred species from St. Helena, probably illustrating the whole of its mollusk fauna, including the curious extinct land-shells. This very interesting contribution was received from Capt. W. H. Turton of the Royal Engineers, Chatham, England. The collection of which this is a representative set was reported on at length by Mr. E. A. Smith, of the British Museum. [[paragraph symbol]] The extinct fresh water mollusk fauna of the Colorado desert has always been of great interest. One by one the species have been