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10.

number of extremely rare African and other shells were purchased or obtained by exchange. These were forms needed to complete the series, and which there was no reasonable prospect of attaining except by purchase. ¶ A remarkably fine series of Tritonium femorale from the 
Bahamas was obtained from Mr I. Greegor, who has also donated a number of interesting
shells from various localities. ¶ Dr. H. von Ihering of Rio Grande do Sul, Brazil, sent a number of South American marine and fresh water shells from that region, several of which were new to the collection, and nearly all from localities not represented in our series. ¶ Dr. Robt. J. Jackson of Boston contributed a series of young stages of oysters and other bivalve shells, illustrative of his recent memoir on the Phylogeny of the Pelecypoda.