REPORT ON THE AMPHIPODA. 1481 



Eyes divided as in Tetrathyrus forcipatus, leaving free a narrow strip at the base of 

 the head, another along its centre, and a space over the rostrum. 



Upper Antenna?. — The first joint of the peduncle cylindrical, the following joint 

 almost evanescent ; the first joint of the flagellum large, the upper margin short, with a 

 tuft of filaments at the apex, the lower margin very long and convex, this part being 

 lined with the thick brush of long filaments and produced into a rounded apex along half 

 the second joint ; the third joint is much thinner than the second, but scarcely shorter, 

 armed like it with a tuft of filaments ; the fourth joint linear, a little longer than the 

 third, with setules at the apex. 



Lower Antennse. — Gland-cone conspicuous ; third joint of the peduncle thick, 

 scarcely curved, about a third as long as the much thinner fourth joint, which is straight, 

 distally widened ; the fifth joint slightly longer than the fourth ; the first joint of the 

 flagellum thinner than the last of the peduncle and a little shorter, the terminal joint 

 very slender, more than three-quarters of the length of the preceding joint. 



Mandibles. — The trunk tolerably straight, very narrow, the striate cutting edge 

 forming an acute angle with the upper margin, the secondary plate of the left mandible 

 similar to the principal plate but smaller ; the first joint of the palp broader and longer 

 than the second, the second curved, making an angle with the first, the third a little 

 sinuous, tapering, longer than the first, making an angle with the second. 



First Maxillse slender, apically pointed. 



Second Maxillae seemingly represented by a pair of broad smooth plates, which are 

 apically narrowed. 



Maxillipeds. — The broad outer plates have the outer margins somewhat folded in, and 

 the inner margins overlapping, the distal portion of each plate carrying a couple of 

 setules. 



First Gnathopods. — The first joint distally widened, the second not longer than 

 broad, the third distally widened, longer than the wrist, the margins carrying some 

 small spinules ; the wrist broader and rather longer than the hand, with spinules on the 

 hind margin ; the hand oblong, a little curved, the slightly concave hind margin a little 

 apically produced ; the finger small, with dilated base, the curved tip when the finger 

 is closed down reaching beyond the narrow concave two-rimmed palmar margin, which 

 has three or four little setules on it or adjacent to it. 



Second Gnathopods. — The branchial vesicles large and oval as in the following pairs, 

 much broader than the first joint. The first joint longer than in the first pair, 

 proximally narrow and bent, with spinules along much of the sinuous front margin ; the 

 remaining joints nearly as in the first gnathopods, but the hand having the hinder apex 

 a little more produced. 



First PersBopods much longer than the gnathopods ; the first joint similar in shape to 

 that of the second gnathopods, the second joint longer than broad, the third broader and 



(ZOOL. CHALL. EXP. — PART LXVII — 1888.) Xxx 186 



