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Show 1889.] ENTOZOA I N T H E B R I T I S H M U S E U M . 325 found in the intestine of Lagopus scoticus. The small rounded head hardly distinct from the long neck, provided with four circular and large suckers, has the rostellum armed with a small crown of very numerous and minute hooks (Baird said the rostellum was unarmed). The genital orifices are marginal, on one side. The ova are small, ovoidal; contents a very small embryo, occupying about the fiftieth part of the total contents of the ova. 16. TAENIA MAGELLANICA, sp. n. (Plate XXXIII. figs. 15, 16.) I propose this name for a species of Teenia collected in Magellan Straits by Dr. Cunningham. This species, of a brown colour, 20-28 millim. in length, is thus characterized:-Head subclavate, rostellum not apparent; suckers large, as wide as the head; neck delicate, of moderate length. Anterior part of the body thin, posterior gradually enlarged ; anterior segments small, following rectangular, the last trapezoidal. Genital orifices lateral, very small, and not easy to recognize. 17. TAENIA BIFARIA, von Siebold, MSS. ? (Baird, Cat. Ent. p. 79). This interesting species has been, so far I know, not yet described. It is characterized as follows :-Head small, triangular, with a conical, pointed, unarmed rostellum and a very small sucker; neck short. Anterior segments small, narrow, gradually enlarged and rectangular, last segments subquadrate. The generative organs are duplicated in each segment, with the genital orifices, which are lateral and prominent, on either side. The penis-sheath is large ; the penis of moderate size, armed with fine spines. Lengths of the specimens taken from the intestine of Nyroca leucophthalma 39-90 millim. EXPLANATION OF PLATE XXXIII. Fig. 1. Distomum microporum, sp. n., nat. size, p. 322. 2. gigas, nat. size, p. 322. 3. , posterior sucker, X 3, p. 322. 4. halosauri, x 3, p. 322. 5. , anterior part of the body; from a microscopical preparation, p. 322. 6. Bidymozoon serrani, sp. n., nat. size: attached to the gills of Serranus fimbriatus, p. 322. 7. Bothriocephalus macrobothrium, sp. n., head, X 6, lateral view, p. 323. 8. , head, X 6, anterior view, p. 323. 9. , last segments, X 3, p. 323. 10. platycephalus, sp. n., head, magnified, p. 323. 11. tetrapterus, head, magnified, p. 323. 12. Phyllobothrium crispatissimum, sp. n., head, magnified, p. 324. 13. Pelichnibothrium speciosum, g. et sp. n., head, X 6, p. 324. 14. , head from a microscopical preparation, p. 324. 15. Teenia magellanica, sp. n., head, magnified, p. 325. 16. , last segments, p. 325. 17. falciformis, a hook, magnified, p. 324. 18. calva, ova, much magnified, p. 324. 19. , a hook, much magnified, p. 324. PROC. ZOOL. Soc-1889, No. XXII. 22 |
