422 



PARASITES OF ANIMALS 



an hydatid (Hydatis), and Rudolphi placed it with the Cysticerci 

 (G. delphini). According to Van Beneden the parasite in 

 question is probably a sexually-immature example of the Phyl- 

 lobothrium delphini described by his son. Edouard Van Beneden 

 found this scolex in great abundance in a dolphin (Delphinus 

 delphis), which he dissected at Concarneau in 1868. The 

 sexually-mature state of this worm is, as the Belgian savans 

 remark, to be looked for in some one or other of the larger 

 sharks. The Phyllobothrium has also been found in the black 

 fish, tursio, or high-finned cachalot (Physeter tursio). M. 

 Gerrard Krefft has described a cestode from the stomach of a 

 dolphin (Delphinus Forsteri), which he terms Tania Forsteri. 

 The strobile only measured 2" in length. It is just possible 

 that the worm may be identical with the species found by 

 Schott. Unfortunately M. Krefft did not find any ova, and his 

 figures do not indicate the position of the reproductive pores, 

 if, indeed, they were present. In this place, therefore, it is 

 fitting to remark that, under the name of Tetrabothrium tri- 

 angulare, Diesing has furnished the diagnosis of a small cestode 



found by Schott in Delphinus 

 rostratus off the coast of Portu- 

 gal. The strobile measured only 

 two or three inches in length, 

 and showed a uniserial dispo- 

 sition of the reproductive pores. 

 Remarking on this species Van 

 Beneden has stated that this is 

 the only sexually-mature tape- 

 worm hitherto encountered in the 

 intestines of the cetacea. This 

 observation, made in 1870, is 

 somewhat unfortunate, because 

 I had already, in the year 1855, 

 described a very large and ma- 

 tureform of cestode (Diphyllobo- 

 thriumstemmacephalum)hom the 



FIG. W.-Dipkyllobothrium stemmactphalum. a, Common porpoise (DelpJlinUSpho- 

 Head, neck, and upper part of the strobile; \ A J "U *.U 



b, front, and, c, profile views of the head. En- CCBna). As Stated by me to the 



Linnean Society in December, 



1857, the small intestine of this porpoise was completely choked 

 for the space of eight or nine feet by fine tapeworms so closely 

 packed together that the gut presented the appearance of a 



