1614 THE VOYAGE OF H.M.S. CHALLENGER. 



Pleopods. — The peduncles long and slender ; coupling-spines not perceived ; cleft 

 spine having a small subapical dilatation to the longer arm ; the interlocking process on 

 the first joint of the outer ramus much bent ; the joints of the rami numbering from six 

 to eight. 



Uropods. — The first pair long and slender, prismatic in section, the peduncle longer 

 than those of the other two pairs, much longer than the rami and also longer than the 

 double segment, the outer and inner margins pectinate, the teeth on the inner margin 

 being shorter, much more numerous and less decurrent than those on the outer ; both 

 members of this pair are unfortunately broken, but the fragment of one is preserved, 

 and shows an outer ramus probably half the length of the peduncle, with long 

 decurrent teeth on the inner margin, some also on the under margin, and the outer 

 margin serrate ; the inner ramus about a third of the length of the outer, with short 

 decurrent teeth on the outer margin, the series not reaching to the apex, the inner 

 margin very closely pectinate, the apex slightly curved, with a spine-like ending; 

 the second pair are much more slender than the first, the peduncles reaching a little 

 beyond the double segment, near to the base of which they are attached ; the upper 

 and inner margins have slender decurrent teeth, the outer margin being sparingly 

 serrate ; the inner ramus is more than half the length of the peduncle, coalesced with 

 it and similarly armed ; the outer ramus minute, not a sixth as long as the inner, 

 having two or three long decurrent teeth on each margin ; the third pair are more 

 slender than the first, but less slender than the second, the peduncles shorter than 

 the double segment, with smooth outer margin and spine-like rather distant teeth on 

 the inner ; the inner ramus nearly as long as the peduncle with which it is coalesced, 

 longer than the rami of the other pairs, having both margins armed with decurrent 

 teeth ; the inner ramus slender, minute, perhaps a tenth as long as the outer, carrying 

 one decurrent tooth on the inner margin. 



Teltson coalesced with the preceding segment, but abruptly narrower, about a third 

 as long as the peduncles of the third uropods, very little broader at the base than at 

 the apex, which is neatly rounded and finely pectinate with little teeth which are 

 longest at the centre of tbe margin. 



Length. — The specimen outstretched measured four-fifths of an inch, the rostrum 

 being broken. 



Locality. —Station 352, Aprd 13, 1876; North Atlantic; kit. 10° 55' N., long. 

 17° 46' W. ; surface; surface temperature, 77°'7. One specimen, female. 



Remarks. — The specific name refers to the shortness of the telson, which is unique 

 among the species hitherto named as belonging to this genus. It may, I think, be 

 presumed that the specimen is a female, since not only are the lower antennas and 

 mandibular palps wanting, but the third joint in the perseopods has the dilatation 



