34 T. V. HODGSON. 



largest. In the fully developed male tlie fifth and sixth joints are remarkably swollen. 

 The enlargement of the fifth joint affects the distal half The eggs are large, and the 

 spherical masses may be two in number on each limb ; they are carried round the 

 fourth joint. 



The Leg extends to a length of 21mm. These appendages do not differ 

 appreciably in size. Of the three coxae the second is much the longest, but not 

 so long as the other two together. The proportions of the three following joints are as 

 4 : 5 : 4"5. The tarsus and propodus together are as long as the femur, the former joint 

 being the longer of the two. The terminal claw is well developed, and is accompanied 

 by two very minute auxiliaries, not one, as stated in the ' Southern Cross ' Collection, 

 Crustacea, p. 258. The entire limb is setose throughout, the setae abundant, and 

 variable in size, some of them distinctly spinous. For the most part their arrangement 

 is irregular, but on the second tibia a linear arrangement begins to be perceptible, 

 and this is clear on the tarsus and propodus, where the setae are much finer. The 

 distal fringe of the first coxa is dorsal, and not so strongly developed as on the 

 two following joints, more especially the third, where it is ventral. On the femur it is 

 chiefly dorsal, and the setae composing it are long and stout. On the first tibia 

 it is complete and rather spinous ventrally ; this is more strongly developed on 

 the second tibia, where there is at least one powerful spine ventrally, and generally 

 two on each side. The male differs from the female in being more setose, the 

 setae being longer, more irregular, but scarcely, if any, stronger. The distal fringe 

 of the third coxa is particularly noticeable for the great length of the setae 

 composing it. 



The Genital apertures of the female are conspicuous on the second coxa of all the 

 legs ; those of the male are much smaller, and can only be detected on the two 

 posterior legs. 



This species was taken in considerable numbers off Cape Adare, but inside 

 Robertson Bay, in 20-26 fm. None were taken by the ' Discovery.' I have re- 

 described it here to remove certain defects of the original description, and on account 

 of the capture of a form which, after considerable hesitation, I feel compelled to regard 

 as only a variety. This species is closely allied to N. hrevicaudatum Miers, with which 

 N. horridum Bohm has been identified by subsequent investigators. TV. hrevicaudatum 

 Miers, can be readily distinguished from N. australe by the following characters : — 



The trunk is more setose. 



The tarsus is shorter than the propodus. 



The terminal claw has two distinct, if small, auxiharies. 



The oviger bears a very much smaller series of denticulate spines, but their lateral 

 teeth are more numerous. 



I am unable to regard the Chsetonymphon altioculatum of Mobius as a distinct 

 species, several examples of which were taken in the vicinity of Bouvet Island during 

 the ' Valdivia ' expedition. 



