Abstract
A single living specimen of Brechites penis (L.) was obtained at low water mark on a sheltered beach on Singapore island in March 1954. With the exception of a small area near the anterior end, where the pallial muscles are inserted into the shell, the remainder of the animal is separated from the calcareous tube by a continuous sheath of periostracum. The posterior adductor muscle is absent, and the anterior adductor is reduced to four small muscle bundles. This condition is described as ‘amyarian’. There are no retractor muscles of the visceral mass, nor does the surface of the visceral mass contain any muscle fibres. The pallial, and siphonal muscles are highly developed. The ciliary sorting and cleansing mechanisms on the ctenidia, labial palps, visceral mass and mantle are figured and described.
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