Abstract
IT is a well known and established fact that some ascidians have a peculiar ability to accumulate vanadium from sea-water. While the vanadium content does not reach 2 p.p.m./dry weight in ordinary marine animals, it exceeds 6,500 p.p.m. in some ascidians of the order Phlebobranchia1. In other orders of ascidians and holothurians this ability is less marked or lacking2. Recently it was reported that an ascidian, Molgula manhattensis, contains and actively incorporates niobium3. It therefore seems probable that ascidians may also be capable of absorbing tantalum. Since no information is available about tantalum in living organisms, it is of interest to know if any tantalum is contained in ascidians besides vanadium and/or niobium.
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