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The radular teeth of the Patellidae consist largely of silica and iron. The teeth of the Chitonidae contain large amounts of iron and little or no silica. The teeth of Dentalium contain small amounts of silica but no iron. Iron and silica have not been found in other radular teeth.

In August, 1932, six specimens of this species were found on the gills of Trachurus [Caranx] trachurus taken at Plymouth. This is the first record of its occurrence in British waters.

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Material and habitat. Various Entozoa have been recorded from time to time occurring in the body cavity of their hosts, but very few records have been made of trematodes living in the coelom of fishes. Looss (1902) gives an account of Probolitrema richiardi (Lopez) occurring in the coelom of Mustelus vulgaris and Acanthias vulgaris, and this is the only form occurring in British marine fishes to which reference can be found in the literature (Nicoll, 1915).