a Part I1f.—Twenty-eighth Annual Report 
“we had the good fortune to find two Amphiptyches urna in its intestine, 
and we now conclude that it is an Nostosite,’* that is, a parasite that 
has now reached its ultimate destination, and therefore a true parasite of the 
Chimera. 
In 1890, in Hist. Nat. des Annelés (coll. des Suites a Buffon), Vol. IIL, 
2nd Part, the author, M. l’Professeur Léon Vaillant; mentions in a foot- 
note to Gyrocotyle, Diesing (p. 539), that this ‘“‘must not be confounded 
with the Amphiptyches, Gr. and W., the unique species of which A. urna has 
been wrongly described under the name of Gyrocotyle amphiptyches, W., 
this last belonging to a group of Trematodes.” But though A. urna is 
referred to in the statement just quoted as unique, there appears to be at 
least another species, A. rugosa, parasitic in a fish found in the South Seas. 
In the Memoir on Flatworms and Mesozoa by F. W. Gamble, in Vol. II. of 
the ‘Cambridge Natural History” (1896), the author not only refers to 
Amphiptyches urna and A. rugosa, but appears to regard them, not as 
Trematodes, but as Monozootic Cestodes belonging to a special family, the 
Cestodaria or Monozoa. The following are that author’s remarks on this 
interesting point (p. 77) :— 
“Just as some Coelenterata (Lucernaria) may be regarded as not having 
advanced much beyond a scyphistoma stage, so there are unsegmental 
Cestodes (e.g., Archigetes) which have remained as a slightly altered but 
sexual scolex, directly comparable with a Trematode, and, as all authors are 
agreed, representing one generation only. Such monozootic forms are now 
classed as a special family, the Cestodaria or Monozoa of which Caryophylleus 
mutabilis from the intestine of various Cyprinoid fish is the most abundant 
representative, while Amphiptyches (Gyrocotyle) urna from Chimera mons- 
trosa of the Northern hemisphere is paralleled by A. rugosa found in 
Callorhynchus antarcticus from the Southern seas,” 
The specimens of Amphiptyches recorded by Grube and Wagener were 
found associated with the shells of Mactra; the specimens of Chimera from 
the Fish Market in which the parasites dealt with here were obtained had 
only a moderate quantity of food in their stomachs, which consisted of 
various organisms, chiefly small Crustacea, Echinoderms and Aunelids, along 
with a few small Molluscan shells such as Anomia, Pecten, Cardium, 
Buccinum, Fusus, Scalaria, all of them small or immature. ‘The parasites 
varied greatly in size—in length as well as in width. The longer specimens 
were narrow in proportion and the wider ones shorter. The longer speci- 
mens, such as that represented by fig. 1, measured fully 30 mm. by 10 mm. 
in width, while that represented by fig. 3 measured 24 mm. by 15 mm. 
The specimen represented by fig. 4 appears to be a young form. The 
specimens have the appearance of being incomplete, or as if they were 
segments ofa larger form. They all occurred, however, as separate organisms ; 
there was no sign of any being joined to one another, though considerable 
care was taken to ascertain if in any case that were so. 
* Ce singulier ver a été trouvé d’abord par G. Wagener dans l’intestine de la 
Chimére de la Méditerranée ; nous n’avons pu l’étudier que sur des individus con- 
servés clans la liqueur, que G. Wagener nous a obligeamment communiqués ; sont-ils 
de vrais parasites internes de ces poissons? Nous en avons douté, et nous pensions 
que ces magnifiques Trématodes étaient des parasites de quelque mollusque bivalve 
que le poisson avait avalés, c’est-a-dire, un parasite erratique , nous nous étions 
trompé. Ayant per nous procurer depuis une Chimere adult dans la liqueur, prove- 
nant de la cdte de Norwége, nous avons eu la bonne chance de trouver deux 
Amphiptyches urna, adultes, dans l’intestin. Nous pouvons en conclure que c’est un 
Nostosite. Cf. op. cit., p. 21. 
