REPORT ON THE PYCNOGONIDA. 97 
with hairs. The side of the eighth joint facing the claw shows a row of regular strong 
spines. The genital pores of the males are smaller than those of the females; they are 
present only on the two posterior pairs of legs. 
As for the geographical distribution of this species, G. O. Sars dredged it in lat. 62° 
44’ 5” N., long. 1° 48’ E., in comparatively deep water (412 fathoms), in the cold area. 
He found there only four specimens, whereas a single haul with the trawl in the Faroe 
Channel yielded among a thousand specimens of Nymphon robustum, Bell, upwards of 
thirty specimens of the species in question. This occurred at 
Station No. 8 (cruise of the “Knight Errant ”). Lat. 60° 3’ N., long. 5° 51’ W. 
August 17, 1880. 540 fathoms. Cold area. 
This station is not very far from the place where it was dredged by Professor G. 
O. Sars, and as this is the only instance, so far as I know, of this species having been 
collected previous to the cruise of the “ Knight Errant,” most probably it has a very 
restricted distribution. 
Nymphon robustum, Bell. 
Nymphon robustum, Bell, Belcher’s Last of the Arctic Voyages, vol. ii. p. 409, 1855, Tab. 
xxxv. fig. 4, 
Nymphon abyssorum, Norman, Wyville Thomson, Depths of the Sea, p. 129, 1873. 
Nymphon hians, Heller, Crustaceen, Pycnogoniden und Tunicaten der K. K. Oester. Ungar. 
Nordpol. Exped. Denkschriften der Wiener Akademie der Wiss., xxxv. 41, 1875. 
Nymphon robustum, Bell, G. O. Sars, Prodromus Crustaceorum et Pyenogonidarum, Arch. fiir 
Math., og Naturvid., ii. 265, 1877. 
An ample discussion of the synonymy of this species, and a description of those 
parts of the body which have hitherto been overlooked, I have given in my paper on the 
Pycnogonids of the cruises of the “ Willem Barents,” to which I have referred above. 
An immense quantity of this true cold area species was dredged during the recent 
cruise of the “Knight Errant.” Mr Murray writes to me that this was the greatest 
haul of Pycnogonids he ever observed. It is a blind species, and along with it were 
trawled a considerable number of specimens of Nymphon macronyx which have distinct 
eyes, about ten specimens of Nymphon strémii also furnished with eyes, one specimen of 
Nymphon grossipes with eyes, and four specimens of Colossendeis proboscidea, Sabine 
(sp.), which is again without eyes. The number of specimens with eggs 1s not very 
considerable, and there is not one which shows the numerous highly developed young 
ones clinging to the ventral side of the body of their parent as is the case with some 
specimens from Barents Sea. 
Finally, I wish to point out that the dimensions of the “ Knight Errant” specimens are 
considerably smaller than those of specimens from higher latitudes. As I have mentioned 
above, this is also the case with the specimens of Nymphon strémii. 
(ZOOL. CHALL. EXP.—PART x.—1881.) K 13 
