ATI.ANT. DEEP-SEA EXPED. 1910. VOL. Ill) 



PYCNOGONIDA 



sixth joint 42 mm long and about IV2 mm thick; the 

 first and the second tarsal joints (fig. 4) are a little more 

 than 5 mm long and about 1 mm thick, tapering towards 

 the tip; the endclaw is IV2 mm long, pointed, slightly 

 curved; no auxiliary claws. The whole foot is furnished 

 with microscopical stiff hairs which are most prominent 

 on the upper side, and arranged in symmetrical longi- 

 tudinal rows. 



This species resembles most closely Colossendeis gigas, 

 which differs from it in the following points: — The pro- 

 boscis is relatively longer and straight; the accessory feet 

 as well as the true feet are relatively longer; the abdo- 

 men is relatively short, only a little more than one-half 

 the length of the body; the lenses of the eyes are wanting; 

 the third joint of the palpi is very little longer than the 

 fifth, and the distal five joints of the palpi show a diffe- 

 rent reciprocal relation in regard to size; the second 

 tarsal joint is only half as long as the first. — The last 

 mentioned character, however, seems to vary a great deal, 

 the relation between the length of the two tarsal joints 

 of C. gigas differing greatly not only among the different 

 specimens, but even in the legs of the same specimen.— 



as the trunk; the neck is short, the oculiferous tubercle 

 exceedingly long, a little longer than the segment of the 

 head (without the proboscis), and with four brown eyes 

 at the point; the legs are relatively short. Total length 

 372 mm. 



Fig. 5. Nymphon longituberculatus n. sp. 



Side view, to show the length of oculiferous tubercle 



and abdomen relative to the that of the body. 



Fig. 6. Nymphon longituberculatus n. sp. 

 Left chelifer. 



Nymphon Fabricius 1794. 



Nymphon brevicollum Hoek. 



One female specimen, 5V2 mm in length, was taken 

 at Stat. 70 in the young-fishtrawl at 1100 metres. 



This species inhabits the northern Atlantic; it was 

 found by the "Challenger" to the south of Halifax at a 

 depth of 8.3 fathoms, not far from the "Michael Sars" 

 record. 



Nymphon grossipes Fabricius. 



Three specimens (two males and one female) were 

 taken at Stat. 102 in a net (1500 metres of wire out). 

 The female is the largest, having a total length of 8V2 

 mm; the two males are about 7V2 mm long, and one of 

 them bears a great number of newly-hatched young (about 

 l j% mm long) and some eggs. 



The geographical distribution of this species embraces 

 the northern Atlantic and the Norwegian Sea, the Arctic 

 Ocean off Greenland, Spitsbergen and Novaja Semlja, as 

 well as the Kara Sea. 



Nymphon longituberculatus n. sp. 



PI. I, fig. B. 



One male was taken at Stat. 38 in the young-fish 

 trawl at 83 metres. The segment of the head is very 

 robust, and its anterior portion is almost twice as wide 



The proboscis with the segment of the head exceeding 

 1 mm, the trunk nearly P/2 mm, and the abdomen about 

 1 mm in length; circumference 16 mm. The segment of 

 the head, seen from above is approximately triangular 

 with an incision at the front Round the two ventral 

 appendages carrying the pincers, we find a ring of micro- 

 scopic hairs. The proboscis is of medium length, some- 

 what stouter than the trunk, directed downwards, cylin- 

 drical, rounded at the point; the mouth big, triangular. 

 The neck is very short, the body relatively slender, ventral 

 appendages well separated, somewhat swollen at the distal 

 end. The abdomen is very long, a little bent upwards, 

 clubshaped, tapering towards the point and furnished with 

 some microscopic hairs. The extreme length of the ocu- 

 liferous tubercle unprecedented among the species of 

 Nymphon, is especially characteristic of this species (fig. 5). 

 It is approximately cylindrical, rounded at the end, and 

 having four brown oval eyes. The pincers are strong, the 

 distal joint longer than the scapus, and furnished with a 

 few hairs along the outer margin (fig. 6). The pincers 

 are as long or a little longer than the palmen, and fur- 

 nished with pointed denticulate spines. 



The palpi are five-jointed, slender and delicate, a 

 little longer than the proboscis; second joint is the longest, 

 the two distal joints furnished with small hairs (fig. 7). 

 The accessory feet are ten-jointed and 5 mm long. The 

 two anterior joints are short, as stout or stouter than the 

 remaining joints, which taper outwards. The third and 



