REPORT ON THE PYCNOGONIDA. 



not to be the work of one who begins to study a group, as is often the case, but can 

 only be done properly after laborious and continuous research. Moreover, the stud)^ of 

 the literature is enormously encumbered by the circumstance, that descriptions of single 

 species often lie buried in obscure periodicals. This cii'cumstance, I hope, will ]je 

 considered, when my report is found to be far from complete. 



The collection of Pycnogonida brought home by the Challenger and placed in my 

 hands numbers about 120 specimens. They were in an excellent state of preservation, 

 and to facilitate the work, the bottles of spirit in which they were put, were furnished 

 with labels indicating the station, latitude, longitude, bottom temperature, and the 

 natm'e of the sea-l^ecl where they were dredged. Some of the specimens were not 

 obtained from any of the 361 dredging stations, but were collected on the shore (near Cape 

 Town, e.g.), or dredged in shallow water (Bahia, Kerguelen). Over a course of 68,890 

 miles the dredge was let down at 361 stations, and Pycnogonids were procured on only 

 twenty-six occasions. The 120 specimens of Pycnogonida brought home belong to 

 thirty-six species, and thirty-three of these I have been obliged to consider and describe 

 as new to science. The greatest depth where a Pycnogonid was found was 2650 fathoms; 

 the greatest depth dredged during the cruise was 4575 fathoms. 



In the following list I have given the range in depth at which species of Pycnogonida 

 were found by the Challenger, and also recently during the cruise of the " Knight 

 Errant":— 



Discoarachne brevrpes, Hoek. 



Hannonia typica, Hoek. 



Phoxichilidium flumiriense, Kroyer. 



Phoxicliilidium insigne, Hoek. 



Nijmplwn bracJii/rhynchiis, Hoek. 



Nymphon hrevicaudatum, Miers. 



Nymphon fuscitm, Hoek. 



Ascorhynclms minutus, Hoek. 



Pallene langnida, Hoek. 



Pallene laevis, Hoek. 



Pallene aimtraliensis, Hoek. 



Plioxicliilidiuin paiaijonicu'in, Hoek. 



Pycnorjonum liforale, Strom. 



Colossendeis megalunyx, Hoek. 



Nymphon hrevieollnm, Hoek. 



Nymjihon grossipes, Oth. Fabr., sp. 



Colossendeis rolnista, Hoek. 



Ascorhijnchus orthorliynclms, Hock. 



Nymphon robustum, Bell. 



Colossendeis leptorhynelms, Hoek. 



Nymphon stromii, Kroyer. 



Nymphon macronyx, G. 0. Sars. 



Colossendeis prohoscidaa, Sab., sp. 



Phoxichilidium pafagonimm, var. elegans, Hoek. 



