APPENDIX. 
Representatives of the Acanthocephala, Trematoda, and Gordiacea are not totally 
wanting in the Challenger collection, but there were none among the specimens sent to 
me, because only a few very delicate larval forms were discovered, and these had already 
been described by the authors who treated of their hosts. In the Reports already 
published the following species are mentioned, for the knowledge of which I have to 
thank Mr. John Murray. 
C. ACANTHOCEPHALA. 
Echinorhynchus corrugatus, Sars. 
Ecliinorliynchus corrugatus, G. 0. Sars, Report on the Schizopoda, Zool. Chall. Exp., vol. xiii. 
part xxxvii. pp. 221, 222, pL xxxviii. figs. 15-18. 
A large larval form, that occurs in the cavity of the abdomen of Euphausia pellucida, 
Dana. 
D. TREMATODA. 
Distomum Jiliferum, Sars. 
Distomum filiferum, G. 0. Sars, op. cit., p. 222, pi. xxxviii. figs. 19-23. 
Larva from the abdominal cavity of Nematoscelis megalops, Sars, and Thysano'essa 
gregaria, Sars. 
Distomum glauci, Bergh. 
Distomum glauci, Bgh., Report on the IS udibranchiata, Zool. ChalL Exp., vol. x. pait xx\i. p. 
18, pi. x. figs. 5-17. 
Distomum glauci, Bgh., K. dansk. Vidensk. Selsk. Skrift., R. 5, Bd. vii., 1864, pp. 282-283. 
This species was found in Glaucus glaciahs, Bergh, and Glaucus longicirrus, Rhdt., 
and in the Challenger expedition it was discovered by the same author in Glaucus 
atlanticus, Forster, and described and figured. It also is a larval form, and destined to 
attain its definitive sexual development in some other animal. 
(ZOOL. CHALL. EXP. PART LXXI. — 1888.) 
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