narrative of the cruise. 
857 
“ Species were recorded from different coasts and seas, but the incompleteness of 
the descriptions made it almost impossible to arrive by their aid at 'any general result 
as far as geographical distribution was concerned. With a few exceptions only, the 
species were all littoral, and these few were chiefly those dredged in the North 
Atlantic, and investigated by G. 0. Sars, 1 and those taken off New England and 
described by E. B. Wilson. 2 
“The study of the material collected during the cruise of H.M.S. Challenger has 
added to our knowledge t of the group in many respects. On twenty-six occasions out 
of two hundred and eighty-two on which the dredge or trawl was let down during the 
Fig. 322 . — Nymphon robustum, Bell. 375 and 540 fathoms. 
cruise, Pycnogonids were taken; a collection was made numbering about one hundred 
and twenty specimens, belonging to thirty-six species, thirty-three of which had to be 
described as new to science. These thirty -three species belong to nine 3 genera, three of 
which are new. Five of these nine genera contain species which may truly be called 
inhabitants of the deep sea. They are the genera Nymplion , Ascorhynchus, Oorhynchus, 
Colossendeis, and Pallenopsis. However, with one exception only ( Oorhynchus ), these 
1 Archiv f. Math, og Naturvid., Bd. ii., 1877, and Bd. iv., 1879. 
2 Report U.S. Commission of Fish and Fisheries, part vi. for 1878, Appendix xv., 1880. 
3 In the Report only eight genera are recorded as represented ; the ninth is the genus Pallenopsis, Wilson. The 
species which belong to this genus were considered in the Report as belonging to Phoxichilidium. ( Vide Hoek, Pycno- 
gonids of the “Triton” Cruise, Tram. Eoy. Soc. Edin., vol. xxxii. p. 9, 1883.) 
