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



Second Maxillse. — The inner plate much broader and a little longer than the outer, the 

 spines short, passing some way down the inner margin, but not nearly all round the broad 

 distal border ; the spines of the outer plate are much longer, passing a little way down the 

 inner margin, and followed by some shorter spines not halfway down the outer margin. 



Maxillipeds. — Differing in few points from those of Eusiroides csesaris ; the inner 

 plates less expanded distally, with a row of six pectinate spines at the top of the outer 

 margin ; one of the jdates had four, the other three, spine-teeth on the distal border ; six 

 slender widely-spaced plumose setae descend far down the outer margin of the outer 

 plate ; the first joint of the palp has the apical spines, but not the groups on the outer 

 margin ; the second joint has the outer margin free except for a large apical group ; there 

 are also on one palp two, on the other three, rows at a little distance within it ; on the 

 inner surface of the third joint there are two long lines of spines ; the finger on one palp 

 had three, on the other palp four, slender spines on the inner margin, the larger number 

 being on the opposite side to that which showed the larger number of spine-teeth on the 

 inner plate. 



First Gnathopods closely resembling those of Eusiroides csesaris, except that the 

 first joint has much of the lower part of both front and hind margin free from spines and 

 setae ; the striated border of the palm is less deep and conspicuous. 



Second Gnathop>ods closely resembling those of Eusiroides csesaris. The front 

 margin of the side-plates is less rounded at the lower corner, the teeth at the lower 

 corner of the hind margin are more marked. The branchial vesicles are broad but not 

 so long as in the other species, while the marsupial plates > are broader and longer. The 

 second joint of the limb has spines at the apex behind, but no spinules higher up on the 

 hind margin ; the hinder apex of the third joint is bidentate, with a spine in the interstice. 



First and Second Perseopods. — These with the side-plates differ but little from those 

 of Eusiroides csesaris. The branchial vesicles are shorter, the marsupial plates wider, 

 the joints perhaps scarcely so stout. In the side-plates of the second pair, the angle 

 below the excavation is sharper than in the other species, and in the limb the third joint 

 is rather shorter than that of the first perseopods, instead of being equal to it. 



Third, Fourth, and Fifth Perseopods. — Between these and the corresponding limbs 

 of Eusiroides csesaris the difference depends chiefly on the first joint, which in the 

 present species is comparatively narrow, a not very broad oval in the third perasopods, 

 longer in the fourth, with the top widened, in the fifth still longer, with the front and 

 hind margins nearly straight, converging a little downwards ; the short second joint has 

 a single group of spines on the hind margin, at its apex. 



Pleopods almost as in Eusiroides csesaris, but the coupling sjtines have a very strong 

 lateral tooth, of which no trace was seen in the companion species ; on the other hand, 

 here the peduncles, though with many lateral setae, appeared to be without the apical 

 group of spines. 



