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Show 1889.] ENTOZOA IN THE BRITISH MUSEUM. 323 At present I give only a figure of this new species to ensure its recognition. The detailed description, with anatomical remarks, will be given in a forthcoming paper. The lengths of the cysts of this new species are 6-10 millim. Didymozoon serrani is the first species of this genus found in a fish of the family Percidse, the other known species inhabiting fishes of the families Scombridse and Sphyrsenidye. CESTO D A. 7. G Y R O C O T Y L E RUGOSA, Diesing, Syst. Helm. vol. i. p. 480. A specimen taken from the intestine of a Callorhgnchus antarcticus from Dunedin (New Zealand). This very strange Cestode has hitherto been found only in Mactra edulis. 8. BOTHRIOCEPHALUS MACROBOTHRIUM, sp. n. (Plate XXXIII. figs. 7, 8, 9.) Head small, with the terminal cupula flattened; bothria lateral, small, prominent, with thick margin ; neck very short, subcylindrical; body flattened. Anterior segments very small, hardly to be distinguished, becoming gradually more distinct towards the end of the body. The last segments not different in form from the preceding, but a little larger. Genital orifices lateral and in the anterior part of the segments. Length of the specimens 16-20 centim. The specimens were taken from the stomach of a Trachypterus, sp. inc., from Mauritius, presented by L. Bouton, Esq. 9. BOTHRIOCEPHALUS PLATYCEPHALUS, sp. n. (Plate XXXIII. fig. 10.) Head pointed, triangular, pyramidal, anteriorly truncated, without distinct terminal cupula. Bothria large, much flattened, with indistinct fossette; neck very short, quadrangular; body flattened. Anterior segments small, the succeeding gradually larger ; posterior margin arcuate ; genital orifices lateral. Lengths of specimens 115- 190 millim. The host of this new species is Beryx decadactyla of Madeira, from which Entozoa have not been previously described. 10. BOTHRIOCEPHALUS TETRAPTERUS, von Siebold, in Lehrbuch d. vergl. Anat. d. wirb. Thiere, Berlin, 1848, pp. 120, 143, 147, in notes. (Plate XXXIII. fig. 11.) I complete Siebold's description of this species, which inhabits Phoca vitulina:-Head cordiform. Bothria lateral, enlarged, with margins expanded, so as to resemble four wings. Anterior segments trapezoidal, distinctly campanulate; the following rectangular, not campanulate, the later decidedly quadrate. I have not observed the incomplete transverse division of the segments described by Siebold. The male and female generative organs are double in each segment, with two distinct genital orifices, very small, situated |
