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arsenic compounds in shellfish except for the giant clam Tridacna maxima, which has trimethylarsonium lactate14) or arsenosugars.12) This paper deals with the isolation and identification of a major arsenic compound in the muscle and mid-gut gland of the ivory shell Buccinum striatissimum, one of carnivorous gastropods which, unlike plankton-feeding bivalves and hervivorous gastropods, are characterized by surprisingly high arsenic contents (up to106.6 ppm: wet wt. basis) in their tissues, especially in muscle.3) Total arsenic was estimated on a Jarrell Ash inductively coupled plasma emission spectrometer (AtomComp Series 800) after wet-digestion of samples with a mixture of HNO3> HC1O4 and H2SO4. In the course of purification, arsenic was determined on the same spectrometer without wet-digestion. From 15 specimens of B. striatissimum purchased at Tokyo Central Wholesale Market, 127 g of muscle (As 38 ppm: wet wt. basis) and 76 g of mid-gut gland (As 18 ppm) were collected. Each tissue was extracted three times with

Identification of arsenobetaine as a major arsenic compound in the ivory shell Buccinum striatissimum.