SYNOPSIS The 1–2 μ protein fibres forming an internal lining to the fragile arenaceous shell of Haliphysema are made of 0.2 μ diameter, cross‐striated fibres, which have an axial period of approximately 670 A and six distinct intraperiod bands. It is suggested that the fibres may be collagen, a fibrous protein generally considered to occur in all animal phyla except the Protozoa. The flexibility of the shell imparted by such a collagenous sheath could account for the survival of this bizarre protozoan in the agitated conditions of the inter‐tidal zone.
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Hedley et al. (1967) studied this question.
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