324 siGNOR F. s. MONTiCELLi ON [June 4, 



in the anterior tbird of the proglottis ; exceptionally they are single, 

 with a single genital orifice. 



Length of complete specimen existing in the collection 55 millim. 



11. Tetrabothrium macrocephalum, Radolphi, Ent. Hist, 

 pt. iii. p. 61. 



Tcenia sulciceps, described and figured by Baird (P. Z. S. 1859, 

 p. Ill, pi. Ivi. figs. 1, la, \b) from the intestine of Diomedea 

 exulans, is only a specimen of this species of Rudolphi, which had 

 not previously been found in Diomedea. 



Again, the Tcenia diomedea, n.sp. (?), described recently by Linstow 

 ('Challenger' Report, Entozoa, p. 13) from Diomedea brachyura, 

 is a specimen of Tetrahothrium macrocephalum, and probably the 

 Tetrabothrium torulosum described by the same author from Dio- 

 medea brachyura is only a synonym of the same worm. 



12. Phyllobothrium CRisPATissiMUM, sp. n. (Plate XXXIII. 

 fig. 12.) 



Very closely allied to P. lactuca and P. tridax, from which it 

 may be easily distinguished by the larger head, the smaller bothria 

 (which are extremely plicated with very small accessory suckers), by 

 the broad and short neck, and by the very small size of the segments 

 of the body, only gradually enlarged near the extremity of the body ; 

 the last segments are rectangular ; genital orifices marginal. 



Lengths of the specimens 1-40-190 millim. Unfortunately the 

 host of this new species is unknown. 



Pelichnibothrium, gen. nov. 

 Head with a large pyramidal haustellnm, anteriorly truncated and 

 provided with a well-developed terminal sucker; bothria four, en- 

 larged, like a basin, completely adherent to the head, each with an 

 accessory sucker, scrobiculiform, and disposed in couples on each side 

 of the head. The bothria of each couple are very near together. 



13. Pelichnibothrium speciosum, sp. n. (Plate XXXIIL 

 figs. 13, 14.) 



There are many specimens taken from Alejndosaurus ferox, from 

 Madeira. I was unable to discover true segments of the body or 

 the generative organs. 



14. TAENIA FALCiFORMis, Baird, Cat. Entoz. Brit. Mus. p. 116; 

 P. Z. S. 1853, p. 24, pi. XXX. fig. 3. (Plate XXXIII. fig. 17.) 



Baird described the rostellum of this Tcenia as unarmed, but with 

 a mark of doubt. I have observed that the rostellum, elongated, 

 conical, and anteriorly subrounded, is armed with eight very slender 

 and long hooks of a very characteristic form ; the neck is indistinct ; 

 the genital orifices are marginal. 



15. T^NiA CALVA, Baird, Cat. Ent. p. 83; P. Z. S. 1853, p. 24, 

 pi. xxxi. figs. 1, la. (Plate XXXIII. figs. 18, 19.) 



There are in the collection numerous specimens of this species 



