92 PERCY SLADEN TRUST EXPEDITION 



sixth segments have setae at or near the hind corners, the seventh segment is much the 

 shortest. Following upon six distinct, moderately short, pleon segments, the telson is 

 of long narrowly oval form, ending acutely, with serrate distal margins, set with setae 

 of various lengths, the largest pair not actually at the apex, though near it. 

 The eyes are dark, round, near the front corners of the head. 



The first antennae form a leading feature, the first joint longer than second and 

 third combined, the third rather longer than the second; the fiagellum is composed of 

 nineteen joints, ten of them stout and furnished with a great bush of long hair-like setae, 

 from which emerges the slender remainder of the lash, carrying short seta?. The second 

 antennae have a very stout second joint, the next longest being the fifth, which is only 

 half as broad; the moderately setose fiagellum of nineteen joints is rather shorter than 

 the peduncle. 



The mandibles end in a long simple tooth; the three joints of the palp are nearly 

 equal in length, rather stout, the curved third being bordered with a neat row of about 

 13 short spines with a long one at the apex. 



The lower lip appears to agree very nearly with the description which Whitelegge 

 gives for that organ in the large Calathura gigas, where no doubt the details would be 

 more easy to make out. He says, " The lower lip is keeled externally on the proximal 

 half and exhibits a tuft of hairs on either side internally which arise from near the base 

 and reach almost to the apex." In our species the hairs or setae appear to arise at some 

 distance from the base. 



The first maxillae have the normal character, the lancet-like head widening a little 

 just below the apex and the inner margin forming a dozen teeth to the backward-directed 

 serrature. The second maxillae were not clearly made out. The maxillipeds have a 

 small epipod adjacent to a slight concavity in the outer margin of the long second joint 

 at its base, this joint being outdrawn on the inner side so as to overlap the first and part 

 of the second joint of the palp. The triangular plate thus formed carries one seta near 

 its apex; the first joint of the palp has four very unequal setae on its inner margin, and 

 the longer second ten such on its apex. 



The first gnathopods have the third joint rather longer than the second but less 

 broad, the fourth almost semicircular, by its transverse position helping the fifth joint to 

 form a wrist, the long massive hand resting upon them, the basal process of its inner 

 margin strongly projecting, and the whole inner margin being closely beset with little 

 spines and longer setae, the former chiefly planted on the convex border, the latter 

 projecting from fines of origin on the surface. The finger, distally much curved, fits over 

 the convex border into the hollow between this and the basal process. 



The second gnathopods have the third joint rather shorter than the second, both 

 slender, the fourth not longer than broad, wrist like, the fifth very small, triangular, 

 under-riding the sixth, which is two and a half times as long as its greatest breadth, 

 fringed on inner margin with long setae and six well-defined spines, the finger slightly 

 curved, not nearly so long as the hand, ending in a very small nail. 



The first peraeopods resemble the second gnathopods, but have the fourth joint 

 rather longer, the sixth more slender. 



