On a new Cestode ibc. from Spitsbergen. 421 



Stiles, C TI., and riARSAT-, A. 1P20. " rndex-Catalntruc Sec, Roimd- 

 worma." U.S. I'ub. Jlealib Service, Ilyg. Lab. Bull. no. 114. 

 Wasliington. 



TiiAVASsos, 1.. li)21. "Contrihutlnns a Vetuda de la Faune Ilelmin- 

 tiiolotrique dii Hresil. — XII I. Essal MonogTaphique sur la famille 

 des Trichostrongylid:e, Leiper, 1009." Mein. d. Inst. Osw. Cruz, 

 vol. xiii. pt. 1. Ilio de Janeiro. 



LIII. — A netv Cestode and other Parasitic Worms from 

 Spitsbergen, uith a Note on Tivo Leeches. Results of the 

 Oxford University Expedition to Spitsberyen. — No. 6. 

 By H. A. Baylis, M.A., D.Sc. 



(Published by permission of the Trustees of the British Museum.) 



The parasitic worms collected by members of the Oxford 

 University Ex]jeditioii to Spitsbergen iuclude a new and 

 interesting Cestode from a seal, two species of Acautho- 

 cepliala, and one of Nematoda. The writer is indebted to 

 Mr. C. S. Elton for kindly handing this material to him for 

 determination. 



The following are the species contained in the collection : — 



CESTODA. 



Cyclophyllidea. 



Fam. Tetrabothriidae. 



Anophryocephalus anophrys, gen. et sp. n. 



Host : a young female seal (Phoca hispida ?). Locality : 

 Klaas Billeu Bay. 



This interesting form agrees closely with typical species of 

 the genus Tetrulothrius in its general anatomy, but differs 

 strikingly from that genus in the structure of its scolex. 

 In Tetrabothrius the scolex is always provided with " auricular 

 appendages/' more or less highly-developed, but in the 

 present species such structures are entirely absent, the 

 scolex having the general appearance of that of the Anoplo- 

 cephalidie or of certain unarmed genera of other families. 



The material consists largely of fragments, but the length 

 of a complete specimen appears to be about 65 mm. The 

 maximum width of the strobila is about 0*85 mm. The 

 dorso-ventral thickness is relatively great, so that some 

 specimens are almost cylindrical in shape. The scolex 

 (hg. 1) is somewhat compressed dorso-veutraily, and has a 



