Ceatode ci^cfrom Sj>ilsherf/en. i->i> 



TetraJiothrins, lying dorsally to tlie ovary and witli the 

 liorns of tlie crescent directed posteriorly. Its wall is 

 composed of cells which stain very deeply witli lueniatoxylin. 

 It gradnally expands in the older segments, but never 

 entirely loses its original cresceutic shape. 



Oncliosphcres have not been observed. It may be that 

 the gravid segments are lost before the full development of 

 the ova in the nterus has taken place. 



In view of the arrangement of the genital organs, it 

 seems necessary to regard this form as very closely related 

 to Tetrahothrius. In addition to the difference in the struc- 

 ture of the scolex, the condition of the excretory system 

 (absence of dorsal vessels and transverse ventral vessels) 

 and the shape of the cirrus-sac (as distinct from the squat, 

 spherical or triangular shape usual in TetraLothrius) are 

 possibly characters of generic importance. 



The family Tetrabothriidae is at present usually restiicted 

 to the genus Tetrahothrius. (The form described by the 

 writer (1914) under the name of Odopetalum probably does 

 not belong to this family.) The presence of auricular 

 appendages, therefore, has hitherto been regarded as a 

 family character, and the inclusion oi Anophryocephalus \\x 

 the family necessitates alteration of the family diagnosis in 

 this particular. The family diagnosis given by Liilie (1910) 

 also includes the condition of the excretory canals usual 

 in Tetrabothrius, but this is omitted by other authors 

 (Fuhrmann (1908), Ransom (1909)). 



It is interesting to observe that some species attributed 

 to Tetrabothrius are recorded in Cetacea, although the 

 majority of the species are found in birds. In seals, up to 

 the present, all the cestodes recorded appear to belong 

 to the Pseudophyllidea (genera Diphyllobothrium^ Pyramico- 

 cephalus, Dipluyonoporus, &c.). 



N E M A T O D A. 



Fam. Ascaridae. 

 Contracacum osculatum (Rud., 1802). 

 A small immature individual, probably belonging to this 

 species, w as taken from the stomach of the same seal. 



ACANTHOCEPHALA. 



Corynosoma strumosum (Rud., 1802). 

 Several specimens were found attached to the wall of the 

 large intestine of the seal already mentioned. 

 Ann. dh Mag. N. Hist. Ser. 9. Vol. ix. 26 



