20 T. V. HODGSON. 



Another specimen, a male, was taken in Winter Quarters, inside the 20-fm. line 

 before the ship was frozen in. It is in a severely mutilated condition, having lost the 

 posterior segment of the trunk and several legs. It differs slightly from the male 

 above described, the lateral processes being a little closer together and the body, 

 especially the cephalic portion, being a trifle stouter, and the tubercular knobs on 

 the lateral processes not being so distinct, but all these features can, I think, be 

 readily accounted for by age. 



This species is closely allied to P. patagonica, Hoek. 



NYMPHON. 



This genus is perhaps the most widely distributed and best known of all th3 

 genera of Pycnogonida. It is readily distinguished from all others by the well- 

 developed chelifori, the five-jointed palps, and the ten-jointed ovigers, the four terminal 

 joints of these being provided with a single row of denticulate spines. The form of 

 the body varies greatly within certain limits, and Professor Sars (25) has subdivided 

 the genus into three : 



Nymphon retains the more slender and comparatively long-legged species. 



Chsetonymphon the more robust and short-legged species, which also, as a rule, are 

 more setose on the body than those of the original genus, Nymphon. 



Boreonymphon, another robust form, readily separable from the others by the 

 absence of teeth on the chelae, the spines of the ovigers being simple and not 

 denticulate. 



The species brought back by the ' Discovery ' are eight in number ; four are 

 assigned to the original genus, though one of these, N. adareanum, bears a few simple 

 spines on the oviger instead of the rows of denticulate spines. The other four, of 

 which one, for the present at least, is regarded as a southern variety of a previously 

 described species, are assigned to the genus Chsetonymphon. 



NYMPHON HIEMALE. 



(Plate III., fig. 1 ; Plate X., fig. 8.) 



Specific characters : 



Body slender, with rather long lateral processes very widely separated. Limbs covered with very 

 minute setae. 



Ocular tubercle stout and short. 



Palps five-jointed, proportions of last three as 7 : 4 : 5'5. 



Oviger ten-jointed, denticulate spines rather numerous, with eight to ten teeth on each side. 



Legs long, scabrous, terminal claw with well-developed auxiliaries. 



Body smooth, slender, with rather long lateral processes, which are very widely 

 separated ; the first of these is curved forwards. The segments are very strongly 

 marked immediately behind the lateral processes. 



The Cephalon is long, the greater part of its length is taken up by a slender 



