Abstract
The material used for the following description consisted of three worms obtained from the intestine of the oystercatcher, Haematopus ostralegus occidentalis Neumann, shot near Aberystwyth. This is the first record of a protogynous tapeworm from Britain. In the whole of the Cestoda the protogynous condition is known only in four other genera, namely, Progynotaenia Fuhrmann (1909), with six species, and Proterogynotaenia Fuhrmann (1911), Leptotaenia Cohn (1901) and Gynandrotaenia Fuhrmann (1936, 1936a), each with a single species. The six known species of the genus Progynotaenia have been recorded from Egypt and the White Nile, Proterogynotaenia rouxi Fuhrmann from the Aru Islands off the coast of New Guinea, Leptotaenia ischnorhyncha (Lühe) from the Mediterranean and Gynandrotaenia stammeri Fuhrmann from Germany.
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