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anatomical characters of the Mollusks referred to is contained in the report together with the revision of the synonymy of many of the species of the coasts of the United States.

Perhaps the most interesting data are those relating to the anatomy of Pleurotomaria; of the bivalves belonging to the families Poromyidæ Dimyidæ, Verticordiidæ, and Cuspidariidæ, together with the description of recent forms of genera like Conomitra, Dolophanes, Mesostoma, Diastoma, Mesorhytis, and Dolichotoma, hitherto known only as Tertiary fossils. The elucidation of the characters of the animal in Aurinia, Scutellina, Capulus, Turcicula, etc. and the determination of the presence of a verge in many Rhiphidoglossa