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Young Quahog.
1 millimeter (1/25 inch) in length, attached to sand grains by the byssus (B). The ssipphon (S) consists of two parts, an incurrent encircle dby twelve tentacles, through which the water enters the mantle chamber of the animal, and an excurrent with four tentacles and filmy telescopic tube through which the water passes out of the mantle cavity. The byssus areises from a gland on the under side of the foot (ft).

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