REPORT ON THE PYCNOGONIDA. t 
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 study of 
the literature is enormously encumbered by the circumstance, that descriptions of single 
species often lie buried in obscure periodicals. This circumstance, I hope, will be 
considered, when my report is found to be far from complete. 
The collection of Pyenogonida brought home by the Challenger and need 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 
nature of the’ sea-bed 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 Pyenogonida 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” :— 
Shore, . : : A Discoarachne brevipes, Hoek. 
re : c 6 Hannonia typica, Hoek. ' 
7 to 20 asee : : Phoxichilidium fluminense, Kroyer. 
“6 3 y : 5 Phoxichilidium insigne, Hoek. 
10%0:120  _,, : : Nymphon brachyrhynchus, Hoek. 
25 +0120  ,, - : Nymphon brevicaudatum, Miers. 
25 4 : c Nymphon fuseum, Hoek. 
38 oF é : Ascorhynchus minutus, Hoek, 
op 5 ; Fi Pallene languida, Hoek. 
38 to 40 ,, ; 3 Pallene laevis, Hoek. 
38 to 120 _ =r, . . Pallene australiensis, Hoek. 
45, 55,175 ,, : ; Phoxichilidium patagonicum, Hoek. 
53 5 5 3 Pycnogonum litorale, Strom. 
55, 70, 120 ,, . : Colossendeis megalonyx, Hoek. 
83 ¢ 7 9 : Nymphon brevicollum, Hoek. 
83 to 540 _—s—*,, ; és Nymphon grossipes, Oth. Fabr., sp. 
120 “ x 5 : Colossendeis robusta, Hoek. 
150 : op : ; Ascorhynchus orthorhynchus, Hoek. 
375 to 540, 0 . Nymphon robustum, Bell, 
400 to 1600 _,, . ; Colossendeis leptorhynchus, Hoek. 
515, 530, 540 ,, ‘ . Nymphon strémii, Kroyer. 
540 : x ; 0 Nymphon macronyx, G. O. Sars. 
+ “ ; Colossendeis proboscidea, Sab., sp. 
600 . op . ; Phoxichilidium patagonicum, var. elegans, Hoek. 
