616 THE VOYAGE OF H.M.S. CHALLENGER. 



little curved at the tij), bordered within with eleven spines ; inner ramus rather like a 

 tadpole, attached by a narrow neck to the peduncle, a broad oval portion following with 

 a row of six sj)ines on the inner margin, a narrow rather sinuous piece forming the 

 termination, a minute cilium occurring where the ovate portion meets the linear. This 

 peculiar form of ramus has been noticed in Ichnopus, Costa, and some other genera. 

 Peduncles of the third pair much shorter than the lanceolate sharply pointed rami, which 

 stretch further back than either of the other pairs ; outer ramus having a nail at the tip, 

 spines along the borders, some of them in groups on the outer margin, and plumose setae 

 on the inner margin ; inner ramus shorter than the outer, with sj)ines and plumose setse 

 on both margins, terminal nail minute. 



Telson reaching further back than the peduncles of the third pair of uropods, narrowing 

 a little towards the apex, outer edges straight, cleft for three-fourths of its length, the 

 laminae not dehiscent except where each curves away from the other to form the apical 

 margin, the outer end of which is produced into a little tooth. At this tooth commences 

 a row of three spines, diminishing in size from the tooth inwards, and followed by two 

 minvite cilia. Along the outer edges there is a row of three spines on each side, the 

 largest a little lower down than the top of the cleft, the middle one the smallest. 



Length. — The pair of specimens, male and female, to which the above description and the 

 figures of PI. V. refer, measured each three-quarters of an inch, exclusive of the antennae. 



Locality. — Station 149d, Royal Sound, Kerguelen Island, January 20, 1874; depth, 

 28 fathoms ; bottom, volcanic mud. Three specimens, which were especially noticeable 

 as being of a deep brown colour in spirits. Dredged. 



Station 149, Accessible Bay, Kerguelen Island, January 9, 1874 ; depth, 20 fathoms; 

 bottom, volcanic mud. Several specimens. Dredged. 



Station 149h, off Cumberland Bay, Kerguelen Island, January 29, 1874; depth, 

 127 fathoms ; bottom, volcanic mud. 



Remarks. — The specimens from Stations 149 and 149h were of various sizes, one 

 reaching as much as nine-tenths of an inch ; they showed the light creamy colour so com- 

 mon in spirit-specimens, and this difference in colouring, combined with other variations, 

 made me long hesitate as to whether the species of PL IV. was the same as that of PI. V. 

 There were differences in the relative proportions of the joints of the antennae, in the 

 shapes of the spines on the outer plate of the first maxillae, in the proportions of the 

 second guathopods, in the armature of the uropods, and especially the inner ramus of 

 the second pair of uropods, though exhibiting the sudden contraction above described, 

 was otherwise more regularly stiliform. I have, however, convinced myself that none of 

 these differences are of specific value. Among the light-coloured specimens the relative 

 proportions of the antennary joints are not constant ; for example, in the upper antennas 

 the first joint varies much in the peduncle, the primary flageUum and the secondary 



