1889.] ENTOZOA IN THE BRITISH MUSEUM. 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. T.ENIA MAGELLANicA, sp. n. (Plate XXXIII. figs. 15, 16.) 



I propose this name for a species of TcBiiia collected in Magellan 

 Straits by Dr. Cunningham. This species, of a brown colour, 20-28 

 millini. in length, is thus characterized : — Head subclavate, ros- 

 tellum not apparent; suckers large, as wide as the head; neck deli- 

 cate, 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. T^NiA BiPARiA, von Siebold, MSS. 1 (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 rectan- 

 gular, last segments subquadrate. The generative organs are dupli- 

 cated 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 OP PLATE XXXIII. 



Fig. 1. Bistomimi mkroponmi, sp. n., nat. size, p. 322. 



2. gigit-s, nat. size, p. 322. 



3. , posterior sucker, X 3, p. 322. 



4. haloscmri, 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 



fimhriatus, p. 322. 



7. Bothrioce'phahis •macrohothrium, 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. tetrapterits, head, magnified, p. 323. 



12. Bhyllohothrium crispatissimum, sp. u., 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. Tenia 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 



