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The latter, as well as the Unionidoe (some of which are recent species), prove the deposit to be of post-pliocene age, instead of cretaceous, as claimed by Dr. Lea, Prof. Whitfield and some others. The character and age of these deposits were further considered by Messrs. Woolman and Heilprin. A paper entitled ' The Planktonokrit, a centrifugal apparatus for the volumetric estimation of the food supply of oysters and other aquatic animals,' by Chas. S. Dolley, M. D., was presented fordoi:10.1126/science.3.75.852-b fatcat:owerhdlgmnhqtjyguids5z3x5y