1596 THE VOYAGE OF H.M.S. CHALLENGER. 



and two following joints faintly furred ; the slender, slightly curved, and very acute 

 finger more than a third the length of the fifth joint. 



Fourth Perseopods. — The first joint broader than in the preceding pair and nearly as 

 long, with some convexity of the front as well as of the hind margin, which is produced 

 beyond it both above and below; the third joint elongate, as long as the remaining 

 three together, pectinate with retroverted teeth along the front margin and its 

 slightly produced apex ; the fourth joint shorter than the fifth, both pectinate ; the 

 finger short, straight, acute. 



Fifth Perseopods. — The side-plates with the hinder angle a little produced, rounded. 

 The first joint about two-fifths as long as the first of the third perseopods, as broad as 

 the length, about one and a half times as long as the feeble remaining joints together ; 

 the second joint with very convex front margin ; the third joint also with convex 

 front ; the fourth much narrower but only a little shorter than the third ; the fifth a 

 little longer than the third ; the finger minute, sharp-pointed. 



Pleopods. — Coupling spines slender in the shaft, with the usual denticulate caps ; 

 the cleft spine with unsymmetrical subapical dilatation of the longer arm ; the joints of 

 the rami eight or nine in number. 



Uropods. — Peduncles of the first pair subequal in length to the double segment, 

 three-edged, the inner margin more closely denticulate than the outer, nearly two and a 

 half times as long as the long outer ramus, which is also three-edged, denticulate, and 

 finely pectinate ; the inner ramus only about a quarter the length of the outer ; the 

 peduncles of the second pair very similar to those of the first and not much shorter, 

 rather more than twice as long as the inner ramus ; the outer ramus about three- 

 cmarters the length of the inner, both of them denticulate and pectinate ; the peduncles 

 of the third pair longer than broad, coalesced with the inner ramus, the inner margin 

 of which is much more strongly denticulate and pectinate than the outer ; the outer 

 ramus is less than half the length or breadth of the inner, with pectinate teeth on the 

 inner margin, the outer margin smooth. 



Telson coalesced with the preceding double segment of which it is less than half 

 the length, its breadth at the base about a third of the length, the apex very acute and 

 outdrawn considerably beyond the uropods. 



Lemjth of the outstretched animal eleven-twentieths of an inch. 



Locality. — Station 287, October 19, 1875 ; South Pacific ; lat. 36° 32' S., 

 long. 132° 52' W.; surface; surface temperature, 57°"8. One specimen, male. 



Remarks. — This species comes exceedingly near to Leptocotis (Oxycephalus) tenui- 

 rostris, Claus, and to Leptocotis lindstromi, Bovallius, hence the specific name. Claus 

 says that in his species the postero-lateral angles (die Seitenflugel) of the pleon- 

 segments are unarmed, yet he figures that of the third segment sharply pointed, as 



