from the South Polar Regions. 459 



attached to tlie traps; occasionally two or even tliree speci- 

 mens were taken at a haul, but this was unusual. It was 

 first found in water of about 12 fatiioms deptli, and subse- 

 quent experience extended this to 12') fathoms. At depths 

 greater than 25 tathonis only stationary traps could be used, 

 but, as far as could be observed, the general nature of the 

 bottom was essentially the same as in shallower water, though 

 more uniform in character. It consisted of the same basaltic 

 rubble as on shore, varying from a coarse sand or fine gravel 

 to stones of variable size, interspersed at intervals with boul- 

 ders, some of w hich were comparatively large. This mixture 

 was very irregular close in shore, where details could be 

 distinctly seen through the clear water. In depths of less 

 than 25 fathoms the j)redonunant feature of the fauna con- 

 sisted of sponges (]\lonaxonida), and it was here that the 

 bulk of the collections was made. In depths of over 

 100 fathoms, Polyzoa were most abundant. Taking into 

 consideration the methods employed, this Pycnogonid seemed 

 to be equally common in both localities. 



A new genus has been proposed for the reception of this 

 species, but trom the description given it will be seen that 

 tiie only feature of importance which separates it from the 

 genus JS^ijmphon is the presence of a tifth pair of legs, a 

 character which separates it from all Pycnogonids hitherto 

 known. 



Pentanymphon, gen. nov. 



Body smooth, very slender, with lateral processes widely 

 separated. Five pairs of ambulatory appendages. 



Mandibles well developed, 2-jointed, chelate. 



Palps 5-jointed. 



Ovigerous legs 10-jointed, terminating in a claw, the last 

 lour joints with a single row of denticulate spines. 



Pentanymphon antarcticum, sp. n. (PI. XIV.) 



Mandibles : chelae long and slender, curved at tips, with 

 short, stout, unifoim and close-set teeth. 



Palps : terminal joint longer than the preceding, which 

 is in turn half the length of the th rd. 



Ovigeious legs : terminal claw dentate ; denticulate 

 spines with seven pairs of lateral teeth, the first being very 

 small. 



Ambulatory legs with a well-developed claw and two 

 auxiliaries ; selje arranged in four rows on the last three 

 joints. 



