1444 THE VOYAGE OF H.M.S. CHALLENGER. 



Fifth Pereeopods. — The first joint as long as that of the fourth perseopods but 

 narrower, about equal in length to the remaining joints together or a little longer, 

 curved, narrowing a little distally, the hind margin convex and very shallowly serrate ; 

 the second joint short, bent back at right angles, not as long as the distal end of the 

 first joint, below which it partially appears ; the third joint turned upwards, rather 

 longer than the second ; the fourth straight, considerably longer but rather narrower than 

 the second ; the fifth longer and narrower than the fourth, though in one of the limbs of 

 this pair the difference in length between these two joints was very slight ; the finger con- 

 siderably more than half the length of the fifth joint, with convex hind margin, the front 

 concave to the point of greatest breadth, then straight and pectinate, the fine teeth of the 

 comb standing at right angles to the margin, and increasing successively almost to the apex. 



Pleopods. — The two coupling spines very short and small ; it appears as if the teeth 

 of the apical caps were prolonged, so that one or other looks like a lateral tooth 

 according to the position in which the spine happens to be seen ; the cleft spine is short, 

 with stout shaft and very short arms, the arm with the subapical dilatation longer than 

 the roughened one ; the joints of the rami number from eleven to twelve ; the first of the 

 inner ramus is attached a little above the first of the outer, and is a good deal narrower 

 at its base than distally ; as usual the peduncles of the first pair are considerably longer 

 than those of the third. 



Urojiods. — The first pair are longer than the second or third, reaching beyond the 

 second, but not so far back as the third ; the plate is lanceolate, attaining its greatest 

 breadth not far from the base, being obliquely pectinate along most of the outer margin 

 as far as the apex, and much more slightly on the lower half of the inner margin ; the 

 second pair are fully as broad as the first, and nearly as long as the third ; the outer 

 margin is much more convex than the inner, with half a dozen distant indents, and 

 fine pectination along the lower half, the inner margin being likewise pectinate in the 

 lower part ; the third pair are much broader than the first or second, with a length more 

 than twice the breadth ; the breadth varies little except at the two extremities ; the 

 outer margin, which is slightly pectinate, and has one or two indents, ends in an acute 

 apex, from which the pectinate distal margin runs obliquely back to the principal apex, 

 which the pectinate inner margin reaches by a sinuous curve. 



Telson small, triangular, rather broader than long, much narrower than the third 

 uropods and little more than one-fifth of their length, the apex slightly rounded. 



Length. — The specimen, in the position figured, measured three-tenths 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, a female with the 

 young far developed. 



Remarks. — Guerin's account differs in making the wrist and hand of the second 



