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



Maxillipeds. — The inner plates distally widened, scarcely reaching beyond the base 

 of the first joint of the palp, with three pectinate spines high up on the inner 

 margin, followed by one or two on the inner surface and four on the distal part of the 

 outer margin ; the truncate distal border being filled by three strong spine-teeth, 

 attended by two or three feathered submarginal spines on the outer surface ; the outer 

 plates not reaching the distal end of the first joint of the palp, the inner margin fringed 

 with numerous slender spines of various lengths, distally pectinate, the series continued 

 at the apex and some way down the outer margin by long plumose setae, six on the outer 

 margin not closely set ; the first joint of the palp rather long and narrow, with three 

 groups of spines on the outer margin and narrowed apex ; the second joint not greatly 

 longer than the first, distally very wide, the front margin and apex fringed with many 

 spines, the hind margin having two small groups and its apex a large one, together with 

 a small group and a solitary spine on the inner surface below it ; the third joint shorter 

 than the first, the apical margin broad and flat, surrounded by strongly pectinate spines, 

 the inner surface set with various groups of spines, the apical part on the outer side 

 closely furred ; the finger short, with three spines on the inner edge, and two or three 

 cilia at the base of the nail, which is short and curved ; a dorsal cilium near the 

 centre. 



First GnatJiopods. — Side-plates deeper than broad, advanced in front to the base of 

 the upper antennae, the broad convex lower margin slightly notched for cilia. The first 

 joint reaching below the side-plate, distally widened, rather longer than the hand, 

 channelled in front, the front margin concave, armed with long setae and spines, the hind 

 margin convex, with numerous groups of short stout spines on the surface just within it ; 

 the second joint short, with a group of spines on the hinder apex ; the third joint short 

 and broad, produced into a sharp point behind and in front, much of the hind margin 

 fringed w T ith groups of pectinate spines ; the wrist short, broad, distally cup-like, the hind 

 margin apically toothed, fringed like that of the third joint, the surface and the front 

 margin also carrying a few groups of spines ; the hand large, a broad oval, narrowest at 

 the hinge of the finger, with a transverse groove on the outer surface near the base, the 

 convex front margin not much longer than the hind margin and palm, having a few small 

 groups of spines on the surface near it ; the hind margin as distinguished from the palm 

 very short, not free from the wrist, armed with three groups of plumose setae ; the long 

 convex palm defined by several strong palmar spines in transverse line on the inner surface ; 

 the palm border itself is strikingly striated at right angles to the outer edges, the multi- 

 tudinous fine rods of the striatums being themselves transversely striated ; at the base of 

 the striated border runs a fringe of spines and spinules on the outer side, and near the 

 base on the inner side another fringe of slender spines or setae, beyond which are some 

 more scattered groups on the surface ; on the outer side just below the spines and 

 spinules is a series of seven or eight great spines, each with a sort of lobe or tooth over 



