28 R. NORPJS WOLFENDEN. 



nearly equal in length and each about as broad as long. The second basal segment has 

 at its distal inner margin a very stout articulating spine, JKi four-fifths as broad as this 

 joint is long. On its outer surface, near the distal and outer end, is a delicate bristle. 

 The third segment is nearly twice as long as the second basal, tapers to a point, and just 

 below the distal end is a delicate little bristle. Near the end of the joint and on the 

 inner side is a very stout broad-based spine, not articulating, and nearly half as long as 

 the whole segment. Frequently the foot of one side is a little longer than of the 

 other. 



The whole animal is very unsymmetrical, especially in the shape of the last 

 thoracic segment and the genital segment of the abdomen. The characters of the 

 swimming feet, as to proportions, and especially as to tlie absence of spines on tin' lu*t 

 joint of tin' f.rnpodite, and the absence of anything like the usual ocelli of Labidocera, 

 are points which appear to remove it from that genus. The abdomen of most females 

 is more or less enveloped in a mass of colourless, structureless membrane. The $ is 

 distinctly five-jointed in the abdomen, whereas in Labidocera this is four-jointed. The 

 right anterior antenna especially also differs from other species. From the characters 

 of the female feet and the abdomen of the males I have thought it justifiable to create 

 a new genus for this animal. I name the species after Mr. Hodgson, the naturalist of 

 the ' Discovery ' Expedition. 



$ smaller than the 9 (1'6 mm). Cephalothorax with head separate from next 

 segment, two dark lateral spots, but not ocelli, in front of the head. Abdomen little 

 more than half as long as the thorax. -Head evenly rounded, without side hooks, last 

 thoracic segment rounded and not produced. Abdomen of undoubtedly five segments, 

 of which the second is about as long as the third and fourth together, the first is very 

 short, the fourth is twice as long as the anal, which is a short segment ; the furcal 

 segments, of which the right is a little larger than the left, are twice as long as broad 

 and three times the length of the anal segment. 



Right anterior antenna a clasping organ, the middle joints swollen, the joint 

 before the elbow with a marginal row of small teeth and with only two distinct 

 segments beyond the elbow, of which the distal is very long and thin (over three times 

 as long as broad), and in its distal part carrying on the inner margin a very long spine 

 tapering to a fine whip-like extremity, but broad in its basal portion. This appendage 

 is half as long again as the whole joint. The joint immediately distal to the elbow has 

 on its margin proximally a short but thick spine. I find it very difficult in any of the 

 specimens, of which there are several, to agree with any degree of accuracy upon the 

 exact number of segments in this antenna owing to the fact of its being curled up 

 in every case. First to fourth feet and mouth organs as in the female. 



5th feet, powerful clasping organs, the right one of four segments, the left of 

 three, with a common basal. The first segment of the right foot has on its inner 

 margin a small knob projection, the second has two short, thick spines, the third a fine 

 spiiii-, mid the last joint is curved into a strong hook, without any appendages. 



