PYCNOGONIDA DREDGED DURING THE CRUISE OF H.M.S. "TRITON." 3 



2. The species which inhabit the warm area in the Atlantic occur also at a 

 much lower latitude near the American coast (N. macrum, Pallenopsis, spec). 

 They are not found in the Arctic Ocean. 



3. The species which inhabit both areas in the Atlantic occur in the Arctic 

 Ocean as well as near the American coast (N. Strbmii, N. hirtipes, N. grossipes). 

 Nymphon serratum inhabits both areas in the Atlantic ; it has been observed in 

 the Arctic, and will probably be found at a much lower latitude. Pallene 

 malleolata inhabits both areas also, and will probably be found to have a wide 

 northern as well as southern distribution. 



4. The only species whose distribution does not seem to be in accordance with 

 the temperature of the water it inhabits is N. longitarse. Hitherto it has only 

 been observed in the warm water area, yet it inhabits the Arctic as well as the 

 New England coast. However, I think this exception is of no consequence : 

 in the first place, because it always, in the northern parts of the Atlantic at 

 least, lives rather solitary, and therefore may be found in the future in the cold 

 area also ; and in the second place, because it is a somewhat uncertain species, 

 and perhaps will turn out to be a variety of N. grossipes. 



A few notes on the species submitted to my examination are appended 

 here : — 



1. Nymphon robustum, Bell. 



A very large number of specimens of this species was obtained at 

 Stations 8 and 9, fourteen specimens were dredged at Station 6, and one specimen 

 was taken from the bottle which contained the Pycnogonids of Station No. 10. 

 The specimens show the same difference with those of higher northern latitudes 

 as do those dredged by the " Knight Errant " in 1880 ; they are not nearly so 

 stout, and are smaller. Numerous specimens had attached to the legs a Scal- 

 pellum, for which I proposed the name Scalpellum nymphocola. It is a 

 curious fact, that the specimens of the Barents Sea (and I studied also those of 

 the third and fourth cruise of the Dutch schooner "Willem Barents") never 

 had this Cirriped on their legs. 



2. Nymphon hirtipes, Bell. 



Only one small specimen of this species was dredged at Station No. 5. Mr 

 Edmund B. Wilson and Professor G. O. Sars apply to this species the name N. 

 hirtum, Fabr. But the description of Fabricius {Entom. System., 1794) is not 

 only very brief, but it is totally insufficient to recognise the species. The 

 species which Kroyer (1845) described under the name N. hirtum, Fabr., no 

 doubt differs from the present species (as is stated by Professor Sars and by 



